California Well Drillers Directory
Every company that appears as the driller of record in the California Department of Water Resources (DWR) Well Completion Reports database, ranked by the number of wells they have drilled. 1,102 California drilling companies account for 563,100 logged wells. Each profile shows the counties a company works, its well characteristics, and links to its original drilling logs — all drawn directly from the state record.
1,102drilling companies
226active since 2022
563,100wells on record
Companies with at least 25 wells on record. "Active" counts wells completed since 2022.
| # | Company | Wells | Since 2022 | Counties | Most recent |
|---|---|---|---|---|---|
| 1 | Peters Drilling And Pump Service | 11,563 | 705 | 13 | 2026-08-07 |
| 2 | Masellis Drilling Inc. | 6,081 | 628 | 9 | 2026-08-11 |
| 3 | J & H Drilling Co. Inc. | 978 | 481 | 17 | 2026-07-21 |
| 4 | Weeks Drilling And Pump Co. | 14,789 | 480 | 16 | 2026-07-10 |
| 5 | Sullivan Drilling Inc. | 1,387 | 480 | 17 | 2026-08-12 |
| 6 | Big River Drilling LLC | 715 | 460 | 6 | 2026-07-08 |
| 7 | Fisch Brothers Drilling, Inc. | 6,393 | 424 | 10 | 2026-08-12 |
| 8 | Farwest Corrosion Control Company | 2,649 | 413 | 26 | 3003-05-23 |
| 9 | Cascade Drilling LP | 826 | 396 | 30 | 2026-07-01 |
| 10 | Scott Belknap Well Drilling Inc. | 1,131 | 391 | 7 | 2026-02-14 |
| 11 | Gregg Drilling LLC | 558 | 375 | 36 | 2026-07-10 |
| 12 | Prieto Anthony J Water Well Drilling Inc. | 637 | 370 | 8 | 2026-07-30 |
| 13 | Strickland Enterprises Inc. | 2,026 | 348 | 8 | 2025-09-29 |
| 14 | Guardino Well Drilling Inc. | 1,736 | 324 | 18 | 2026-07-30 |
| 15 | American Construction And Supply Inc. | 1,685 | 313 | 42 | 2026-07-02 |
| 16 | Stehly Brothers Drilling Inc. | 2,191 | 289 | 4 | 2026-06-04 |
| 17 | Filipponi-Thompson Drilling Inc. | 2,133 | 282 | 6 | 2026-07-16 |
| 18 | Bradley & Sons Inc. | 3,627 | 274 | 18 | 2026-07-17 |
| 19 | Shasta Drilling Inc. | 739 | 251 | 4 | 2026-08-12 |
| 20 | Canepa And Sons Inc. | 3,173 | 250 | 40 | 2026-08-07 |
| 21 | Parks Water Resources | 385 | 241 | 11 | 2026-06-30 |
| 22 | Gary C Tanko Well Drilling Inc. | 12,022 | 231 | 12 | 2029-12-19 |
| 23 | Calwater Drilling Company Inc. | 5,421 | 229 | 13 | 2026-06-30 |
| 24 | Zim Industries Inc. Dba Bakersfield Well & Pump Co. | 1,716 | 198 | 35 | 2026-06-25 |
| 25 | L O Lynch Quality Wells & Pumps Inc. | 3,373 | 192 | 6 | 3016-03-30 |
| 26 | W. S. Heitman Drilling & Pumps | 626 | 192 | 7 | 2026-07-23 |
| 27 | Castle Well Drilling Inc. | 294 | 192 | 6 | 2026-06-17 |
| 28 | Quality Well Drillers Inc. | 3,524 | 190 | 9 | 2026-07-21 |
| 29 | A B C Liovin Drilling Inc. | 1,281 | 189 | 25 | 2026-03-06 |
| 30 | American Well Drilling And Pump Service | 439 | 189 | 6 | 2026-07-24 |
| 31 | Haynes & Sons Well Drilling | 1,242 | 182 | 4 | 2026-07-23 |
| 32 | Living Water Well Drilling | 441 | 180 | 9 | 2026-07-31 |
| 33 | Arsenal Well Drilling Inc. | 234 | 180 | 11 | 2026-05-24 |
| 34 | Valley Well Drilling LP | 410 | 178 | 12 | 2026-08-05 |
| 35 | Corrpro Companies Inc. | 737 | 176 | 28 | 2026-02-06 |
| 36 | Yellow Jacket Drilling Services LLC | 291 | 175 | 15 | 2026-05-05 |
| 37 | Johnson Drilling Co. | 11,865 | 169 | 38 | 2026-08-04 |
| 38 | Maggiora Bros Drilling Inc. | 4,674 | 168 | 34 | 2026-07-13 |
| 39 | 99 Drilling LLC | 265 | 167 | 6 | 2025-11-18 |
| 40 | Diamond Core Drilling Inc. | 480 | 166 | 14 | 2026-07-24 |
| 41 | Rumsey / Lang Well Drilling & Pumps Inc. | 729 | 165 | 2 | 2026-08-10 |
| 42 | Les Petersen Drilling & Pump Inc. | 4,096 | 163 | 7 | 2026-07-27 |
| 43 | Huckfeldt Well Drilling Inc. | 1,881 | 162 | 8 | 2026-08-04 |
| 44 | Earth Flow Drilling Company | 2,192 | 158 | 5 | 2029-03-14 |
| 45 | Good Earthkeeping Organization Inc. | 157 | 157 | 1 | 2025-11-11 |
| 46 | Miller Drilling Co. | 1,775 | 153 | 9 | 2026-06-23 |
| 47 | Well Industries Inc. | 558 | 153 | 34 | 2026-07-16 |
| 48 | Horner & Sons Inc. | 348 | 153 | 2 | 2026-07-22 |
| 49 | Irwin Well Drilling | 1,906 | 143 | 7 | 2026-08-07 |
| 50 | Consolidated Testing Laboratories Inc. | 1,405 | 138 | 12 | 2026-07-10 |
| 51 | H & B Drilling And Sons LLC | 414 | 136 | 13 | 2026-07-03 |
| 52 | Wellco Drilling Inc. | 1,375 | 135 | 4 | 2026-07-08 |
| 53 | Rich Well Drilling & Pump Service Inc. | 371 | 135 | 4 | 2026-05-19 |
| 54 | Heritage Well Service | 528 | 129 | 4 | 2025-05-08 |
| 55 | North American Drilling Company | 692 | 125 | 5 | 2026-05-13 |
| 56 | Yosemite Falls Inc. | 706 | 117 | 11 | 2026-05-11 |
| 57 | Grabow Well Drilling Company | 2,646 | 116 | 8 | 2028-03-30 |
| 58 | Bar - H Well Drilling Inc. | 197 | 116 | 1 | 2026-08-04 |
| 59 | Camp S A Pump Company | 497 | 111 | 7 | 2026-07-17 |
| 60 | Hennings Bros Drilling Co. Inc. | 6,823 | 107 | 14 | 2026-07-02 |
| 61 | Superior Pump & Drilling Inc. | 369 | 107 | 2 | 2026-07-24 |
| 62 | Triangle Well Drilling | 2,894 | 104 | 5 | 2026-07-30 |
| 63 | Gregory Drilling Incorporated | 143 | 103 | 27 | 2026-04-02 |
| 64 | Fisch Drilling And Pump Inc. | 663 | 102 | 9 | 2026-07-10 |
| 65 | Central Valley Well Drilling & Pumps LLC | 102 | 102 | 3 | 2026-05-29 |
| 66 | B & B Well Drilling Incorporated | 390 | 100 | 5 | 2026-08-07 |
| 67 | Arthur & Orum Well Drilling Inc. | 3,219 | 99 | 16 | 2025-06-12 |
| 68 | Wildrose Drilling LLC | 102 | 97 | 20 | 2025-10-14 |
| 69 | B L Grant Inc. | 192 | 96 | 3 | 2026-07-29 |
| 70 | Eagle Well Drilling & Pump Service | 542 | 95 | 4 | 2026-08-07 |
| 71 | Fain Drilling & Pump Co. Inc. | 3,029 | 92 | 8 | 2026-07-10 |
| 72 | Myers Brothers Well Drilling Inc. | 2,865 | 92 | 28 | 2025-09-27 |
| 73 | Environmental Control Associates | 277 | 92 | 9 | 2025-04-17 |
| 74 | C R Well Drilling | 455 | 88 | 6 | 2026-06-25 |
| 75 | Kings River Drilling LLC | 194 | 87 | 3 | 2026-08-03 |
| 76 | Enloe Drilling And Pumps Inc. | 442 | 84 | 8 | 2025-12-30 |
| 77 | Bruce Mackay Pump & Well Service Inc. | 260 | 82 | 10 | 2026-08-07 |
| 78 | A & M Well Drilling Inc. | 146 | 82 | 1 | 2026-08-11 |
| 79 | Wallis Water Systems | 688 | 81 | 4 | 2025-12-08 |
| 80 | Dechenne Water Well Drilling Inc. | 1,204 | 79 | 5 | 2024-04-24 |
| 81 | Bc2 Environmental LLC | 416 | 78 | 18 | 2025-07-23 |
| 82 | A-1 Drilling & Pump | 218 | 77 | 5 | 2026-01-18 |
| 83 | Vics Well Drilling Inc. | 337 | 73 | 17 | 2026-06-09 |
| 84 | Geocentric Drilling Inc. | 81 | 73 | 8 | 2026-05-15 |
| 85 | Tanko Well Drilling | 3,311 | 70 | 10 | 2026-04-08 |
| 86 | M L Well Drilling And Pumps Co. | 411 | 68 | 3 | 2023-03-31 |
| 87 | Maier & Dougherty Pump & Supply Inc. | 241 | 68 | 3 | 2026-04-20 |
| 88 | Sebastian Valente | 66 | 66 | 2 | 2026-07-10 |
| 89 | Walt Bannon Drilling Inc. | 2,498 | 64 | 9 | 2026-06-18 |
| 90 | Granite Drilling Company | 476 | 64 | 6 | 2026-05-21 |
| 91 | Pacific Coast Well Drilling Inc. | 337 | 63 | 19 | 2026-06-13 |
| 92 | Briski Well Drilling Co. | 2,747 | 62 | 7 | 2026-03-13 |
| 93 | Conners Well Drilling | 149 | 60 | 4 | 2026-07-09 |
| 94 | Will Peterson Well Drilling | 173 | 59 | 4 | 2024-12-12 |
| 95 | All American Drilling Inc. | 144 | 58 | 4 | 2026-07-27 |
| 96 | Your H20 Pro | 58 | 57 | 7 | 2026-07-08 |
| 97 | Coast Drilling Inc. | 278 | 54 | 4 | 2026-06-01 |
| 98 | Business Midstate Drillers | 117 | 54 | 3 | 2026-08-06 |
| 99 | Eaton Drilling Co. LLC | 3,793 | 52 | 35 | 2024-06-21 |
| 100 | T S A Drilling Inc. Dba Penecore Drilling | 577 | 52 | 20 | 2025-06-26 |
| 101 | Pitcher Services LLC | 114 | 52 | 16 | 2025-07-01 |
| 102 | Stonehouse Well Drilling | 157 | 51 | 24 | 2026-07-26 |
| 103 | Jensen Kelin Drilling | 94 | 51 | 12 | 2026-07-02 |
| 104 | Mickelson Enterprises Inc. | 174 | 50 | 4 | 2026-04-07 |
| 105 | Water Well Service Inc. | 145 | 50 | 11 | 2026-06-06 |
| 106 | Torrent Resources CA Incorporated | 54 | 50 | 2 | 2026-03-10 |
| 107 | Southern California Well Service LLC | 50 | 50 | 6 | 2026-07-07 |
| 108 | Clear Heart Drilling Inc. | 694 | 49 | 15 | 2025-02-26 |
| 109 | Taylor Drilling And Pump Inc. | 341 | 48 | 3 | 2026-05-05 |
| 110 | Signal Drilling Company | 8,301 | 47 | 37 | 2029-12-26 |
| 111 | Well Tec Services Inc. | 126 | 47 | 4 | 2026-07-24 |
| 112 | Daugherty Pump & Drilling | 122 | 47 | 3 | 2026-07-07 |
| 113 | King Pump And Well, Inc. | 47 | 47 | 4 | 2026-06-15 |
| 114 | Chambers D P Drilling | 488 | 46 | 4 | 5302-03-01 |
| 115 | Altamont Water Well And Pump | 90 | 46 | 6 | 2026-03-30 |
| 116 | Big'n & Son Drilling Inc. | 46 | 46 | 3 | 2026-06-05 |
| 117 | Goodell Well & Pump Service | 342 | 45 | 6 | 2026-06-09 |
| 118 | Mazzi Well Drilling | 209 | 45 | 2 | 2026-03-27 |
| 119 | Rodrigues Pump Company | 61 | 45 | 2 | 2026-05-08 |
| 120 | Martell Water Systems Inc. | 1,094 | 44 | 23 | 2026-03-25 |
| 121 | Chambers Choice Drilling | 73 | 44 | 3 | 2026-06-26 |
| 122 | Layne Christensen Company | 2,362 | 43 | 38 | 2026-07-01 |
| 123 | R & M Water Well Drilling & Pumps Inc. | 91 | 43 | 5 | 2025-04-15 |
| 124 | Hch Water Wells Inc. | 43 | 43 | 6 | 2026-07-13 |
| 125 | Drew & Hefner Well Drilling | 43 | 43 | 6 | 2026-05-02 |
| 126 | Detray Drilling | 468 | 42 | 2 | 2025-09-19 |
| 127 | Kvilhaug Drilling & Pump Inc. | 327 | 42 | 20 | 2026-05-15 |
| 128 | Best Drilling And Pump Inc. | 248 | 41 | 13 | 2026-08-10 |
| 129 | South Valley Pump & Drilling | 69 | 41 | 10 | 2026-07-14 |
| 130 | MC Lean & Williams Inc. | 830 | 40 | 4 | 2026-07-21 |
| 131 | Nor - Cal Pump & Well Drilling Inc. | 248 | 40 | 26 | 2026-01-15 |
| 132 | Keller Drilling And Pump | 51 | 40 | 6 | 2025-12-10 |
| 133 | DL Well Drilling | 40 | 40 | 3 | 2026-07-24 |
| 134 | J & O Well Drilling | 159 | 39 | 8 | 2026-03-27 |
| 135 | Slagle Drilling Corp | 45 | 39 | 2 | 2023-02-27 |
| 136 | Waters Backhoe & Dozer Service | 110 | 38 | 5 | 2026-03-23 |
| 137 | Dierkop Paul | 78 | 38 | 1 | 2026-04-29 |
| 138 | Bryant Pump & Drilling Company | 1,000 | 37 | 10 | 2025-11-24 |
| 139 | Cascade Well Co. | 371 | 37 | 3 | 2025-12-16 |
| 140 | Dos Palos Well Drilling | 788 | 34 | 5 | 2025-11-24 |
| 141 | Blaine's Well Drilling | 55 | 33 | 5 | 2026-07-20 |
| 142 | Kurt Lingemann Well Drilling | 538 | 31 | 2 | 2026-06-10 |
| 143 | Bess D Pump & Well Elect | 359 | 31 | 5 | 2025-04-08 |
| 144 | Pacific Coast Well & Pump Inc. | 182 | 31 | 9 | 2026-04-29 |
| 145 | Scotty's Well Drilling | 140 | 31 | 1 | 2026-05-27 |
| 146 | Oasis FG Drilling | 60 | 31 | 4 | 2026-03-20 |
| 147 | Water Resource Heritage Inc. | 33 | 31 | 3 | 2024-04-12 |
| 148 | Top Hat Well Drilling | 31 | 31 | 8 | 2026-08-02 |
| 149 | Precision Well Drilling Inc. | 189 | 30 | 2 | 2025-12-04 |
| 150 | HP Water Systems Inc. | 55 | 30 | 3 | 2026-07-07 |
| 151 | Trinity Drilling Inc. | 36 | 30 | 4 | 2026-07-17 |
| 152 | Mcquoid Well Drilling Inc. | 30 | 30 | 1 | 2026-07-06 |
| 153 | D & D Drilling Inc. Dba Valley Drilling Co. | 1,282 | 29 | 9 | 2025-11-12 |
| 154 | Samuel's Drilling | 38 | 29 | 2 | 2026-01-28 |
| 155 | Smith's Pumps Inc. | 97 | 28 | 3 | 2025-07-10 |
| 156 | Matthew Davis Enterprises Inc. | 40 | 28 | 5 | 2026-07-03 |
| 157 | Crisp Well Drilling | 34 | 28 | 2 | 2026-07-15 |
| 158 | National Corrosion | 28 | 28 | 6 | 2026-07-29 |
| 159 | Sierra Exploration Drilling Co. Inc. | 802 | 27 | 6 | 2026-05-08 |
| 160 | Farm Pump And Irrigation Company Inc. | 451 | 27 | 13 | 2026-07-15 |
| 161 | Fredrick Mark Pump & Supply Co. | 295 | 26 | 8 | 2026-02-05 |
| 162 | A Z C A Drilling & Pump Inc. | 171 | 26 | 5 | 2026-08-04 |
| 163 | Hearn Ritchison Drilling LLC | 26 | 26 | 1 | 2025-10-21 |
| 164 | Southwest Pump & Drilling Inc. | 290 | 24 | 8 | 2026-05-14 |
| 165 | Solomon Well Drilling & Pump Service Inc. | 194 | 24 | 1 | 2023-09-14 |
| 166 | Tri County Drilling And Pump | 117 | 24 | 2 | 2026-05-20 |
| 167 | Barba Drilling | 51 | 24 | 2 | 2026-05-25 |
| 168 | Bertram Drilling Inc. | 1,171 | 23 | 33 | 2026-01-20 |
| 169 | Superior Well Service | 327 | 23 | 5 | 2026-02-02 |
| 170 | Valley Pump & Motor Works Inc. | 181 | 23 | 11 | 2025-08-27 |
| 171 | Diversified Drilling | 82 | 23 | 5 | 2023-07-30 |
| 172 | Myers Well Drilling Inc. | 763 | 22 | 9 | 2024-03-22 |
| 173 | Purviance Drillers Inc. | 663 | 22 | 7 | 2025-10-31 |
| 174 | Garrison Brothers Well Service | 46 | 22 | 4 | 2025-07-23 |
| 175 | Rindahl Drilling | 110 | 21 | 5 | 2025-05-06 |
| 176 | Drill Hog | 74 | 21 | 5 | 2025-11-24 |
| 177 | D & D Pumps | 46 | 21 | 3 | 2025-03-28 |
| 178 | Jak Drilling And Pump | 62 | 20 | 2 | 2023-12-29 |
| 179 | C J Logan Pump & Electric Inc. | 34 | 20 | 2 | 2026-04-15 |
| 180 | Landino Drilling Co. | 151 | 19 | 7 | 2026-07-13 |
| 181 | MC Quoid Well Drilling | 137 | 19 | 1 | 2023-02-16 |
| 182 | Confluence Environmental Inc. | 65 | 19 | 7 | 2025-06-02 |
| 183 | Hansen-Welldo-Service Inc. | 138 | 18 | 3 | 2026-04-20 |
| 184 | Mid State Pump And Drilling | 74 | 18 | 9 | 2025-05-29 |
| 185 | Chico Construction Inc. | 67 | 18 | 2 | 2026-06-11 |
| 186 | Abundant Water Wells | 173 | 17 | 6 | 2023-12-06 |
| 187 | Anthony J Prieto | 2,330 | 16 | 8 | 2023-02-24 |
| 188 | Chancellor Drilling & Pump | 41 | 16 | 3 | 2024-10-14 |
| 189 | Phifer Well Service | 37 | 16 | 5 | 2026-07-20 |
| 190 | Roadrunner Drilling & Pump Company Inc. | 205 | 15 | 24 | 2026-05-01 |
| 191 | Krazan & Associates | 30 | 15 | 7 | 2025-10-13 |
| 192 | Koenig Drilling | 39 | 14 | 3 | 2026-06-23 |
| 193 | Barbour Well Inc. | 32 | 14 | 6 | 2025-08-19 |
| 194 | Condon-Johnson & Associates Inc. | 25 | 14 | 3 | 2024-10-10 |
| 195 | Lundigan Drilling | 179 | 13 | 2 | 2025-12-11 |
| 196 | Fred Ash & Sons Lynch Pump Co. | 118 | 13 | 4 | 2026-05-27 |
| 197 | Palm Springs Pump Inc. | 115 | 13 | 6 | 2025-11-11 |
| 198 | Lackey Drilling | 41 | 13 | 2 | 2025-02-14 |
| 199 | Frank's Well Driling | 740 | 12 | 3 | 2024-08-13 |
| 200 | Hearn Drilling Co. | 492 | 12 | 4 | 2022-11-29 |
| 201 | Dougherty Pump & Drilling Inc. | 486 | 12 | 3 | 2024-11-19 |
| 202 | Sar Construction | 47 | 12 | 4 | 2025-10-28 |
| 203 | Mel Meyer | 101,127 | 11 | 56 | 9999-09-09 |
| 204 | Thomas Murphy Pump & Well | 55 | 10 | 1 | 2025-12-11 |
| 205 | J W Morrison Inc. | 39 | 10 | 2 | 2025-05-23 |
| 206 | DE LA Grange & Sons Inc. | 263 | 9 | 11 | 2024-09-19 |
| 207 | Donald C Vickery Well Drilling | 150 | 9 | 3 | 2024-10-09 |
| 208 | Westervelt Well Drilling | 122 | 9 | 5 | 2024-03-31 |
| 209 | Henry George Farnsworth | 43 | 9 | 1 | 2025-07-11 |
| 210 | Diamond Well & Pump Inc. | 26 | 9 | 4 | 2025-05-09 |
| 211 | Taber Drilling | 87 | 8 | 6 | 2025-07-24 |
| 212 | Loverin Pump & Drilling Co. | 58 | 8 | 2 | 2025-08-20 |
| 213 | Clouser Drilling Incorporated | 36 | 8 | 2 | 2026-07-06 |
| 214 | Exploration Geoservices Inc. | 956 | 7 | 16 | 2026-07-22 |
| 215 | Seebeck M E | 567 | 7 | 10 | 2025-06-05 |
| 216 | Enloe Well Drilling | 279 | 7 | 8 | 2026-04-22 |
| 217 | Pacific Coast Drilling | 262 | 7 | 12 | 2023-04-05 |
| 218 | Tanko Bros Inc. | 2,617 | 6 | 13 | 2022-05-11 |
| 219 | Maranatha Drilling And Pump Service | 307 | 6 | 6 | 2025-04-15 |
| 220 | Vannucci Technologies | 66 | 6 | 5 | 2023-01-31 |
| 221 | Sargent Drilling | 442 | 5 | 14 | 2022-07-11 |
| 222 | Michael Scott Lincicum Well Drilling Pump Installation | 304 | 5 | 2 | 2023-07-10 |
| 223 | V T S Drilling LLC | 92 | 5 | 6 | 2022-11-04 |
| 224 | Heuer Well Drilling | 62 | 5 | 2 | 2024-10-21 |
| 225 | Britton Exploration | 36 | 5 | 6 | 2026-05-01 |
| 226 | Petro - Lud Inc. | 26 | 5 | 4 | 2024-01-19 |
| 227 | Fred Ash & Sons | 1,217 | 4 | 5 | 2028-02-24 |
| 228 | National E W P Inc. | 431 | 4 | 28 | 2023-06-12 |
| 229 | Grade Drilling Co. | 43 | 4 | 7 | 2022-09-01 |
| 230 | Pro-H20 Drilling And Pump Company | 39 | 4 | 3 | 2024-06-24 |
| 231 | Lucerne Valley Pump Service | 26 | 4 | 1 | 2026-06-30 |
| 232 | Crum Sam Water Well Drilling Inc. | 591 | 3 | 7 | 2024-04-10 |
| 233 | Gulf Shore Construction Services Inc. | 28 | 3 | 6 | 2022-07-13 |
| 234 | Sixkiller Drilling | 26 | 3 | 2 | 2022-06-30 |
| 235 | Martin Pump & Supply Inc. | 2,524 | 2 | 9 | 2026-01-18 |
| 236 | Kirschenman's Well Drilling | 1,159 | 2 | 5 | 2029-02-20 |
| 237 | Wilkinson Enterprises Inc. | 445 | 2 | 8 | 2022-07-25 |
| 238 | Kruse Drilling Company | 373 | 2 | 3 | 2022-05-31 |
| 239 | Kenneth Roman | 320 | 2 | 5 | 2029-06-18 |
| 240 | Cache Creek Drilling | 247 | 2 | 17 | 2023-01-20 |
| 241 | Boart Longyear Company | 172 | 2 | 23 | 2022-03-26 |
| 242 | Hedman Drilling | 126 | 2 | 5 | 2022-08-31 |
| 243 | Louis P Bouscal | 97 | 2 | 1 | 2025-04-12 |
| 244 | Drilling Services Inc. | 63 | 2 | 9 | 2025-09-04 |
| 245 | Curtis Drilling Co. | 42 | 2 | 2 | 2024-10-14 |
| 246 | Gregg Drilling & Testing Inc. | 4,828 | 1 | 41 | 7012-02-07 |
| 247 | Beymer Well Service | 2,921 | 1 | 15 | 2029-08-25 |
| 248 | Bill Belknap | 2,758 | 1 | 21 | 2025-10-19 |
| 249 | Howard Pump Inc. A California Corporation | 1,650 | 1 | 11 | 2022-02-14 |
| 250 | Kelley Pump & Drilling | 1,515 | 1 | 2 | 2029-11-07 |
| 251 | American Technological Drilling Service Inc. | 1,385 | 1 | 5 | 2029-11-22 |
| 252 | Blake Hennings | 1,362 | 1 | 8 | 2025-04-16 |
| 253 | Bannon Walt Drilling Co. Inc. | 978 | 1 | 5 | 2024-08-27 |
| 254 | Chappell Pump & Supply Inc. | 927 | 1 | 7 | 2028-03-06 |
| 255 | Randall N Wallis | 531 | 1 | 9 | 2022-02-04 |
| 256 | Aguanga Waterwell Services Inc. | 504 | 1 | 2 | 3003-04-03 |
| 257 | Guardino Pump & Well | 482 | 1 | 10 | 2028-09-22 |
| 258 | Yosemite Falls Well Drilling | 464 | 1 | 8 | 2028-10-28 |
| 259 | Fundin Well Drilling | 394 | 1 | 3 | 2029-05-01 |
| 260 | Robert Allen Nix Well Drilling | 373 | 1 | 3 | 2022-09-01 |
| 261 | Baldwin & Son Well Drillers | 319 | 1 | 5 | 2027-08-10 |
| 262 | Valley Well & Pump Co. Inc. | 308 | 1 | 5 | 2028-12-16 |
| 263 | Tanko Gary C Well Drilling | 284 | 1 | 5 | 2029-06-26 |
| 264 | Moosios Pump Co. Inc. | 127 | 1 | 5 | 2026-12-24 |
| 265 | Clifford Pump & Well Company | 117 | 1 | 3 | 2027-03-26 |
| 266 | A A A Drilling Service | 99 | 1 | 6 | 2027-04-18 |
| 267 | Gopher Drilling | 79 | 1 | 6 | 2027-02-25 |
| 268 | Malcolm Drilling Company Inc. | 63 | 1 | 6 | 2024-06-11 |
| 269 | Kleinfelder Inc. | 54 | 1 | 11 | 2023-07-07 |
| 270 | Five Star Well Drilling Inc. | 45 | 1 | 5 | 2022-01-18 |
| 271 | Davis D A Company | 34 | 1 | 2 | 2026-08-10 |
| 272 | West Coast Exploration Inc. | 30 | 1 | 3 | 2022-07-12 |
| 273 | Bfr Associates | 5,621 | — | 22 | 2012-07-24 |
| 274 | Cascade Drilling Inc. - California | 3,167 | — | 36 | 2015-01-24 |
| 275 | Cascade Drilling L P | 2,827 | — | 43 | 2020-06-01 |
| 276 | Vaca Drilling Co. /Del Crew JR | 2,745 | — | 6 | 2007-11-28 |
| 277 | W D C Exploration & Wells | 2,421 | — | 42 | 2012-09-07 |
| 278 | Stroming Machinery | 2,391 | — | 5 | 2008-10-15 |
| 279 | Myers Reverse, Inc. | 2,389 | — | 18 | 2009-06-16 |
| 280 | Tezak Pump Co. Inc. | 2,380 | — | 5 | 2004-12-19 |
| 281 | Fronk's Mountain Drilling | 2,378 | — | 7 | 2009-01-29 |
| 282 | Aufdenkamp Drilling Inc. | 2,330 | — | 4 | 2017-07-10 |
| 283 | Hall Thomas A | 1,789 | — | 5 | 2015-11-18 |
| 284 | Floyd V Wells | 1,771 | — | 4 | 2006-09-26 |
| 285 | West Hazmat Drilling Corp | 1,702 | — | 29 | 2004-12-13 |
| 286 | Ivan D Alexander Water Well Drilling | 1,617 | — | 3 | 1990-10-18 |
| 287 | Woodward Drilling Company Inc. | 1,542 | — | 27 | 2019-11-05 |
| 288 | Rex Anderson Corp | 1,493 | — | 6 | 2007-06-30 |
| 289 | Acme Drilling Company | 1,439 | — | 10 | 2018-07-17 |
| 290 | Dunn Jack Inc. | 1,424 | — | 5 | 1985-04-09 |
| 291 | Robert Dawson Drilling & Pumps | 1,415 | — | 6 | 2007-11-09 |
| 292 | Nutting And Jensen Drilling | 1,410 | — | 5 | 2017-07-16 |
| 293 | MC Dougall's Well Drilling Inc. | 1,345 | — | 5 | 2000-06-14 |
| 294 | Rottman Drilling Co. | 1,331 | — | 16 | 2018-03-16 |
| 295 | D Hedman & Co. | 1,305 | — | 9 | 2009-09-17 |
| 296 | Bill Pulliam | 1,299 | — | 3 | 2019-11-08 |
| 297 | Allen Drilling Co. | 1,295 | — | 5 | 2007-09-28 |
| 298 | Beylik Drilling & Pump Service | 1,267 | — | 29 | 2012-03-12 |
| 299 | Aulman And Aulman Drilling Con | 1,251 | — | 5 | 1976-12-17 |
| 300 | H & B Drilling | 1,248 | — | 7 | 2017-06-29 |
| 301 | Pitcher Drilling Co. | 1,232 | — | 23 | 2019-02-11 |
| 302 | Moss Roscoe Company | 1,220 | — | 25 | 2019-10-16 |
| 303 | Hunt Drilling Company Inc. | 1,213 | — | 13 | 2018-09-05 |
| 304 | Arrow Well Drilling | 1,202 | — | 4 | 2014-11-12 |
| 305 | Redhawk Drilling | 1,197 | — | 4 | 1988-06-26 |
| 306 | Fox Gary & Co. | 1,185 | — | 4 | 2013-06-15 |
| 307 | Crislip Drilling Company | 1,174 | — | 5 | 1993-04-23 |
| 308 | Dejesus Pump & Well Drilling Inc. | 1,157 | — | 8 | 2014-06-21 |
| 309 | Doshier-Gregson Inc. | 1,156 | — | 6 | 2021-06-30 |
| 310 | Diamond Well Drilling Company Inc. | 1,150 | — | 8 | 2021-04-15 |
| 311 | Mariposa Well Drilling Company Inc. | 1,146 | — | 6 | 2019-12-21 |
| 312 | Jack Jones Wells & Pumps | 1,145 | — | 8 | 2016-12-16 |
| 313 | Anderson K Drilling, Inc. | 1,136 | — | 6 | 2017-10-20 |
| 314 | Wayne Drilling Co. | 1,113 | — | 13 | 1984-04-03 |
| 315 | Wilder, R., Drilling Company | 1,089 | — | 6 | 1994-07-18 |
| 316 | Beaman & Son Pump Co. | 990 | — | 3 | 1976-08-14 |
| 317 | D B Drilling Co. | 973 | — | 4 | 2007-07-04 |
| 318 | American Drilling | 970 | — | 8 | 1993-12-07 |
| 319 | Kile's Well Drilling | 943 | — | 16 | 2016-06-15 |
| 320 | Tri-K Drilling | 935 | — | 4 | 2000-12-05 |
| 321 | Aqua Drilling | 923 | — | 4 | 2009-10-02 |
| 322 | Panero Well Drilling Inc. | 921 | — | 5 | 1983-10-31 |
| 323 | Alexander Brothers | 903 | — | 3 | 2016-01-27 |
| 324 | Baldwin & Son Well Drilling | 901 | — | 8 | 2010-04-02 |
| 325 | Larbre Well Drilling And Pumps Inc. | 895 | — | 3 | 2017-09-25 |
| 326 | Starr Drilling And Pump Co. | 875 | — | 20 | 1986-09-26 |
| 327 | Herb Schwartz & Son Inc. | 875 | — | 3 | 2005-07-17 |
| 328 | Whitten Pumps Inc. | 874 | — | 11 | 2010-11-08 |
| 329 | Ballard & Foote | 870 | — | 5 | 1991-05-31 |
| 330 | Hammond Bros | 847 | — | 1 | 1978-07-24 |
| 331 | Western Well Drilling Co. Ltd | 842 | — | 28 | 2021-09-19 |
| 332 | A & A Gross Drilling | 816 | — | 9 | 2020-08-15 |
| 333 | Owens Drilling Co., Inc. | 805 | — | 3 | 2000-06-20 |
| 334 | Johnson Teddy J | 797 | — | 5 | 1972-04-19 |
| 335 | Myers Brothers Inc. | 796 | — | 20 | 1989-05-02 |
| 336 | Roger L. Nation | 796 | — | 4 | 1998-11-10 |
| 337 | H T Ted Herr | 776 | — | 4 | 2007-06-19 |
| 338 | Jim Mcclain Wells | 768 | — | 3 | 2006-12-29 |
| 339 | Mcguffie Well Drilling | 763 | — | 1 | 1992-09-29 |
| 340 | Schramm Drilling & Pump Co. | 762 | — | 2 | 1998-11-20 |
| 341 | R & B Drilling | 761 | — | 4 | 2006-11-08 |
| 342 | Woods Well Drilling | 755 | — | 5 | 1999-09-29 |
| 343 | Midway Drilling & Pump Company | 753 | — | 10 | 2006-01-30 |
| 344 | Diversified Exploration Co. Inc. | 751 | — | 11 | 1970-04-21 |
| 345 | Butler Drilling Company | 714 | — | 4 | 2011-07-27 |
| 346 | Salinas Pump Company | 712 | — | 8 | 2019-04-02 |
| 347 | Trudell Drilling Co. | 707 | — | 7 | 1998-07-11 |
| 348 | Landino Construction And Well Drilling | 703 | — | 5 | 1995-08-22 |
| 349 | Preston Well Drilling | 698 | — | 6 | 1989-10-09 |
| 350 | C O Brose Well Drilling | 698 | — | 6 | 1987-09-17 |
| 351 | C & N Pump & Well Co. | 697 | — | 15 | 1999-04-21 |
| 352 | Peter Garicia | 695 | — | 4 | 2007-09-27 |
| 353 | Freedom General Repair & Pump Shop | 690 | — | 7 | 1985-11-30 |
| 354 | D. W. Slooum | 688 | — | 5 | 1995-09-24 |
| 355 | C F Dougherty | 685 | — | 6 | 1971-02-26 |
| 356 | Levnard T Larson | 681 | — | 7 | 1979-09-21 |
| 357 | H O Krossa | 681 | — | 4 | 1969-04-10 |
| 358 | Water-Tech Well Drilling | 665 | — | 9 | 2010-07-12 |
| 359 | Wayne Environmental Drilling Company Inc. | 664 | — | 11 | 2002-12-13 |
| 360 | Coachella Valley Pump & Supply | 660 | — | 4 | 1994-10-21 |
| 361 | Weldon Francis M | 652 | — | 4 | 1980-07-19 |
| 362 | Vironex, Inc. | 649 | — | 12 | 2014-05-27 |
| 363 | Bootjack Drilling Inc. | 649 | — | 8 | 1997-11-11 |
| 364 | Simpson Drilling Company | 644 | — | 6 | 1987-03-29 |
| 365 | Aqua Engineering | 641 | — | 5 | 2019-11-22 |
| 366 | Osterberg And Stewart | 636 | — | 6 | 2008-11-01 |
| 367 | Wessel, Curtis | 628 | — | 2 | 1979-05-06 |
| 368 | Fisch Bros Pump Service | 620 | — | 5 | 1990-09-29 |
| 369 | H-F Drilling, Inc. | 618 | — | 10 | 2001-06-06 |
| 370 | Ron Engeldinger Well | 616 | — | 3 | 1999-11-08 |
| 371 | Independent Well Drilling Inc. | 615 | — | 3 | 2015-04-01 |
| 372 | Harich Enterprises Company Inc. | 612 | — | 4 | 2020-01-30 |
| 373 | All Well Abandonment | 607 | — | 20 | 2018-01-31 |
| 374 | Knapp & Graham Inc. | 596 | — | 6 | 1968-04-23 |
| 375 | Norton Drilling | 596 | — | 6 | 2020-08-18 |
| 376 | Bartley Pump Inc. | 596 | — | 5 | 2004-05-17 |
| 377 | Crown Drilling & Pump | 596 | — | 3 | 2014-04-04 |
| 378 | Underwood Well Drilling | 586 | — | 2 | 1997-03-08 |
| 379 | Frank Scully/Morrison Drilling Inc. | 582 | — | 6 | 2011-02-11 |
| 380 | Mccalla Brothers | 578 | — | 8 | 1988-05-11 |
| 381 | Osterberg And Carroll | 561 | — | 5 | 1965-01-27 |
| 382 | Wasco Drilling Company, Inc. | 554 | — | 10 | 2009-06-18 |
| 383 | Rock Well Drilling | 543 | — | 5 | 2003-11-03 |
| 384 | Manos Jim Drilling & Pump | 542 | — | 2 | 2015-05-20 |
| 385 | Water Well Supply | 533 | — | 5 | 2000-05-03 |
| 386 | Slate And Skaggs | 522 | — | 3 | 1969-10-14 |
| 387 | Boetsch Well Drilling And Pump Service | 522 | — | 6 | 2019-10-05 |
| 388 | Rauch Drilling Company Inc. | 520 | — | 9 | 1997-10-09 |
| 389 | Ken Gross Pump Service | 507 | — | 6 | 2019-07-07 |
| 390 | Sheela Drilling | 499 | — | 3 | 1984-02-11 |
| 391 | Anderson Brothers Water Well Drilling & Domestic Pumps | 492 | — | 3 | 2018-04-14 |
| 392 | Dicken's Drilling | 490 | — | 7 | 2016-12-21 |
| 393 | Doshier And Gregson Drilling Inc. | 489 | — | 6 | 1981-05-19 |
| 394 | Valley Pump & Drilling Co. | 475 | — | 10 | 1972-10-27 |
| 395 | S A Andresen All Terrain Exploration | 468 | — | 20 | 2002-04-08 |
| 396 | Beks Acquisition Inc. | 465 | — | 8 | 2019-03-26 |
| 397 | Sutter Pump Works | 449 | — | 4 | 1967-11-06 |
| 398 | Henry Kozera | 448 | — | 2 | 1998-07-07 |
| 399 | Burt Drilling Co. | 438 | — | 10 | 2014-11-08 |
| 400 | Batson Drilling Service | 436 | — | 4 | 2003-12-08 |
| 401 | Oscar L Nation | 431 | — | 3 | 1969-09-18 |
| 402 | John Linn Drilling, Co. | 428 | — | 6 | 1997-12-04 |
| 403 | Maranatha Drilling | 423 | — | 3 | 2010-03-17 |
| 404 | Brown Elvin | 422 | — | 5 | 1998-04-19 |
| 405 | Patten Well Drilling | 421 | — | 4 | 1989-04-16 |
| 406 | Digges & Son | 421 | — | 3 | 1998-02-03 |
| 407 | Tom Hunt Drilling Co. | 418 | — | 11 | 1994-08-01 |
| 408 | Harris A J Inc. A California Corporation | 416 | — | 4 | 1983-01-12 |
| 409 | Bob Beeman Drilling Company | 410 | — | 2 | 1995-02-02 |
| 410 | R Wilder Gen Cont | 409 | — | 5 | 1985-08-30 |
| 411 | Pambeau Pump & Well | 405 | — | 3 | 1995-03-31 |
| 412 | Resonantsonic International Inc. | 397 | — | 23 | 2011-11-08 |
| 413 | Raymond Alsop | 397 | — | 2 | 1987-06-11 |
| 414 | Herbert Schwartz | 389 | — | 3 | 2005-07-26 |
| 415 | Walter F Rettela | 389 | — | 3 | 1977-10-18 |
| 416 | Trunnell Wells & Pumps | 384 | — | 7 | 1983-10-03 |
| 417 | Testamerica Drilling Corp | 378 | — | 20 | 2011-04-14 |
| 418 | Lott Drilling Co. | 378 | — | 3 | 2019-07-15 |
| 419 | Weimer Stan Enterprises Inc. | 377 | — | 7 | 1980-06-17 |
| 420 | Herbert Schwartz & Son | 377 | — | 2 | 1973-12-20 |
| 421 | Sears Well Drilling | 376 | — | 3 | 1988-07-22 |
| 422 | Williams Well Drilling | 376 | — | 12 | 1992-07-08 |
| 423 | Pearson Pump And Drillling Company Inc. | 366 | — | 3 | 1994-08-18 |
| 424 | Tahoe Pump & Drilling Inc. | 358 | — | 6 | 1981-06-13 |
| 425 | Everett A Loewenstein | 357 | — | 4 | 2020-09-20 |
| 426 | Big Valley Water LLC | 356 | — | 5 | 2016-01-02 |
| 427 | Clearwater Drilling | 351 | — | 3 | 2004-06-16 |
| 428 | Raymond L Olson | 350 | — | 3 | 2002-05-03 |
| 429 | Roy V Alsop & Son Inc. | 349 | — | 2 | 1992-04-28 |
| 430 | Cruse Drilling Co. | 341 | — | 14 | 1997-09-07 |
| 431 | Belknap Pump Company Inc. | 340 | — | 4 | 2018-11-17 |
| 432 | James E Wright, JR | 328 | — | 4 | 1966-08-10 |
| 433 | Seanaco Inc. | 327 | — | 11 | 2005-11-09 |
| 434 | Mann Brothers | 326 | — | 5 | 1974-10-16 |
| 435 | Clovis Pump & Water Well | 323 | — | 8 | 1999-01-28 |
| 436 | Dane Pike Wells And Pump | 323 | — | 2 | 2002-10-08 |
| 437 | David And Son Drilling | 318 | — | 6 | 2018-12-07 |
| 438 | Bayland Drillers | 317 | — | 8 | 1998-11-09 |
| 439 | Davis & Davis Well Drilling | 315 | — | 3 | 1989-03-24 |
| 440 | Cooper Drilling Co. | 315 | — | 3 | 2010-09-17 |
| 441 | M P Burgess | 313 | — | 4 | 1999-04-16 |
| 442 | Harold Nutting | 313 | — | 3 | 1977-09-29 |
| 443 | M A Bryant Drilling | 311 | — | 4 | 1993-05-21 |
| 444 | Allen Drilling & Equipment Co. | 311 | — | 5 | 1982-08-11 |
| 445 | V & W Drilling | 310 | — | 20 | 2017-01-04 |
| 446 | Melvin Slate Water Well Drilling | 310 | — | 5 | 1969-06-09 |
| 447 | Olson's Plbg & Heating | 308 | — | 6 | 1998-10-30 |
| 448 | Spectrum Exploration Inc. | 307 | — | 23 | 2006-09-27 |
| 449 | American Well Drilling | 307 | — | 5 | 1998-03-25 |
| 450 | Filipponi & Thompson Drilling Company | 303 | — | 5 | 2000-08-09 |
| 451 | Bakersfield Pump Co. | 303 | — | 7 | 2000-07-13 |
| 452 | C. Cruse Drilling | 301 | — | 17 | 2003-03-14 |
| 453 | Ike's Pump & Drilling Inc. | 300 | — | 3 | 2017-09-01 |
| 454 | Anderson Pump Company | 299 | — | 4 | 2003-12-16 |
| 455 | R F Keyt | 299 | — | 5 | 1980-09-15 |
| 456 | Big Valley Drilling | 294 | — | 9 | 2019-06-20 |
| 457 | Kearns-Rivard Well Drilling | 291 | — | 5 | 1968-06-05 |
| 458 | Bill Rambeau Pump & Well Drilling | 288 | — | 5 | 2015-12-10 |
| 459 | Aquarius Drilling And Pump Co. | 288 | — | 4 | 1999-01-19 |
| 460 | West Coast Drilling | 288 | — | 6 | 2010-06-15 |
| 461 | B & J Drilling Company | 282 | — | 2 | 1977-02-25 |
| 462 | Desert Water Drilling Company | 279 | — | 5 | 1980-03-27 |
| 463 | P H Thurman | 277 | — | 2 | 2020-06-23 |
| 464 | Cullum Systems Incorporated | 277 | — | 9 | 1984-08-22 |
| 465 | Active Drilling & Pump Supply | 276 | — | 2 | 2020-07-01 |
| 466 | J Field Drilling Co. | 275 | — | 8 | 2010-03-08 |
| 467 | H A M Drilling Inc. | 273 | — | 9 | 1990-03-09 |
| 468 | Clark Well Inc. | 273 | — | 4 | 2001-04-28 |
| 469 | Belknap Scott M Well Drilling | 272 | — | 4 | 2016-04-20 |
| 470 | Multi Water Systems | 269 | — | 6 | 2001-04-14 |
| 471 | Fred H King | 267 | — | 3 | 1998-06-06 |
| 472 | Crwelldrilling | 266 | — | 2 | 2017-10-31 |
| 473 | Pacific Gas And Electric Company | 264 | — | 22 | 2018-03-27 |
| 474 | Water Well Drilling Cont | 263 | — | 6 | 1981-07-17 |
| 475 | Hudson R Barrow | 262 | — | 3 | 1983-09-22 |
| 476 | Melville L E & Sons Drilling Co. Inc. | 262 | — | 3 | 2018-08-24 |
| 477 | George Chamberlain | 256 | — | 4 | 1970-10-10 |
| 478 | Layne-Western Co. Inc. | 255 | — | 29 | 1991-11-06 |
| 479 | Owen Drilling Co. | 255 | — | 2 | 1978-05-23 |
| 480 | Mcgann Drilling | 254 | — | 5 | 1983-09-06 |
| 481 | American Well & Pump Service | 254 | — | 5 | 1979-05-16 |
| 482 | Flynn Well Drilling | 252 | — | 3 | 1975-11-26 |
| 483 | Faria Welldrilling | 250 | — | 2 | 2018-09-26 |
| 484 | Digges & Son Water Well Drilling | 250 | — | 3 | 1999-04-09 |
| 485 | Schrack Drilling Co. | 247 | — | 4 | 2021-09-17 |
| 486 | Heer Nar S | 245 | — | 12 | 2013-05-01 |
| 487 | Rockwell Drilling Co. | 244 | — | 8 | 1991-07-09 |
| 488 | Arrowhead Group | 244 | — | 6 | 2000-06-28 |
| 489 | Lennys Drilling | 243 | — | 1 | 2020-01-27 |
| 490 | Roman Well Drilling | 242 | — | 5 | 2001-11-20 |
| 491 | Harris A J Co. | 239 | — | 7 | 1979-10-02 |
| 492 | R D Norris & Son | 237 | — | 6 | 1956-06-21 |
| 493 | Wellmaster Drilling Company | 236 | — | 1 | 1991-03-23 |
| 494 | Pulliam Well Exploration Inc. | 234 | — | 3 | 2019-10-22 |
| 495 | Precision Sampling Inc. | 234 | — | 13 | 2011-10-12 |
| 496 | ED Fields Water Well Drilling | 234 | — | 12 | 2010-10-29 |
| 497 | 3-D Drilling Company | 233 | — | 5 | 2017-08-30 |
| 498 | Sage Bros Drilling Co. | 232 | — | 6 | 1983-06-03 |
| 499 | Mccalla Bros Pump And Drilling Co. | 229 | — | 5 | 1960-10-24 |
| 500 | Tri-County Drilling Inc. | 227 | — | 6 | 2018-09-27 |
| 501 | V L Allen | 227 | — | 1 | 1997-02-10 |
| 502 | Fox Loomis Incorporated | 225 | — | 8 | 2018-08-29 |
| 503 | Datum Exploration Inc. | 223 | — | 12 | 1991-07-15 |
| 504 | Island Drilling | 221 | — | 21 | 2019-08-02 |
| 505 | Frank P Conley | 218 | — | 5 | 1960-01-30 |
| 506 | D W Slocum Water Well Drilling | 217 | — | 7 | 1967-05-27 |
| 507 | Weeks Drilling Co. | 217 | — | 3 | 1957-07-31 |
| 508 | C. J Longwell | 217 | — | 2 | 1964-09-14 |
| 509 | Lynch L O Well Drilling And Supply | 213 | — | 3 | 1979-02-20 |
| 510 | Rottman Dick Water Well Drilling | 211 | — | 4 | 2014-12-12 |
| 511 | Fred W Porter & Son | 207 | — | 6 | 1983-07-28 |
| 512 | Rainbow Drilling | 207 | — | 7 | 2016-09-18 |
| 513 | Todd Ameteye | 205 | — | 1 | 1997-11-19 |
| 514 | Benny DI Prima | 205 | — | 2 | 1996-01-26 |
| 515 | Eagle Drilling | 205 | — | 1 | 1997-12-10 |
| 516 | Winter Abajian Well Drilling | 203 | — | 8 | 2003-07-22 |
| 517 | Leonard A Anderson Company | 203 | — | 2 | 1995-09-15 |
| 518 | Randazzo Drilling Services | 202 | — | 2 | 2003-04-10 |
| 519 | Strickland Drilling | 201 | — | 3 | 2008-11-07 |
| 520 | Tock-Bishop Well Drilling | 201 | — | 2 | 1981-07-14 |
| 521 | Turner Explorations Inc. | 200 | — | 5 | 1996-01-13 |
| 522 | Mitchell Drilling Environmental Corp | 199 | — | 13 | 2007-12-05 |
| 523 | Motheral Well Drilling | 198 | — | 2 | 1996-04-05 |
| 524 | Clifford Suffdy | 198 | — | 2 | 1970-04-04 |
| 525 | Forster Pump & Engineering Inc. | 197 | — | 3 | 2016-08-31 |
| 526 | Cranmer & Ellis Water Well Drillers | 197 | — | 5 | 1980-07-31 |
| 527 | Barstow Pump & Drilling | 197 | — | 1 | 1984-07-30 |
| 528 | D-R Water Well Drill | 196 | — | 3 | 1996-06-30 |
| 529 | Pioneer Pump And Well Co. | 195 | — | 8 | 2006-11-21 |
| 530 | Redfeairn R L Drilling | 195 | — | 14 | 2013-08-24 |
| 531 | Van Norman Well Drilling | 194 | — | 2 | 1998-03-05 |
| 532 | Robert Garcia Well & Pump Co. | 192 | — | 9 | 1996-09-17 |
| 533 | Clement D Clubb C-G Drilling | 192 | — | 2 | 1990-07-22 |
| 534 | Baker Lester A Wells & Pumps | 191 | — | 4 | 2008-05-01 |
| 535 | John L Panero JR | 188 | — | 2 | 1977-04-06 |
| 536 | Curtis Hole Drilling Company | 187 | — | 7 | 1992-11-25 |
| 537 | S/G Testing Laboratories Inc. | 187 | — | 9 | 2021-02-11 |
| 538 | Harrison & Son's | 187 | — | 2 | 1982-06-28 |
| 539 | Fisher & Sons Well Drilling Company | 187 | — | 1 | 1984-01-20 |
| 540 | Don Redfeairn Drilling Co. | 186 | — | 12 | 1997-12-06 |
| 541 | Jensen Drilling Company | 186 | — | 10 | 2020-03-17 |
| 542 | Kirkland Well Service | 184 | — | 4 | 1980-01-16 |
| 543 | Ritchey Bros | 183 | — | 5 | 2018-01-10 |
| 544 | Sayatovich J | 183 | — | 1 | 1981-09-22 |
| 545 | Clark Albert M | 181 | — | 5 | 1996-01-11 |
| 546 | Western Well Drilling & Service | 181 | — | 2 | 1985-08-23 |
| 547 | American River Well Drilling | 180 | — | 4 | 2001-03-30 |
| 548 | Dejesus Ernest Pump And Well Drilling Service | 178 | — | 2 | 2011-06-12 |
| 549 | Anderson & Seebeck | 178 | — | 4 | 1972-05-16 |
| 550 | Burnham & Plum Well Drilling Co. Inc. | 177 | — | 3 | 2001-04-27 |
| 551 | Pearson Well Drilling | 176 | — | 5 | 1967-02-10 |
| 552 | Vaca Drilling Co. | 176 | — | 3 | 1986-08-04 |
| 553 | Paul Williams And Sons | 175 | — | 7 | 2000-04-11 |
| 554 | White, Walter N. | 175 | — | 1 | 1992-10-17 |
| 555 | Beylik Drilling Inc. | 174 | — | 13 | 2002-05-01 |
| 556 | Roy Alsop Pump & Drilling | 173 | — | 3 | 2019-03-30 |
| 557 | Ralph E Anderson | 171 | — | 8 | 1975-07-29 |
| 558 | D W Moore Well Drilling | 170 | — | 3 | 1982-05-21 |
| 559 | Corrosion Technology Inc. | 169 | — | 9 | 1985-11-08 |
| 560 | Blain & Imbach Well Drilling | 168 | — | 4 | 1976-05-09 |
| 561 | Golden Empire Drilling | 168 | — | 12 | 1997-09-04 |
| 562 | Badger Drilling Company | 168 | — | 1 | 2000-10-19 |
| 563 | Doshier-Gregson Well Drilling Service | 167 | — | 4 | 1969-12-20 |
| 564 | Fain Drilling Company | 167 | — | 3 | 1977-01-10 |
| 565 | F H Dengley | 167 | — | 2 | 1955-10-19 |
| 566 | Duval's Well Drilling | 167 | — | 2 | 1992-05-28 |
| 567 | Points West Inc. | 165 | — | 4 | 1987-01-14 |
| 568 | Glenn Martell & Son Inc. | 164 | — | 3 | 1987-10-13 |
| 569 | Steve's Pumps & Well Drilling Inc. | 162 | — | 11 | 2021-05-13 |
| 570 | Kenneth J Mcavoy | 161 | — | 3 | 1984-03-04 |
| 571 | Warren Opie Wallis | 161 | — | 1 | 1981-02-13 |
| 572 | Gehrke-Bloomer | 160 | — | 4 | 1997-01-25 |
| 573 | San Diego Pump & Well Drillers | 160 | — | 2 | 1979-11-06 |
| 574 | SO Cal Pump And Well Drilling | 158 | — | 8 | 2010-09-14 |
| 575 | HI-Desert Drillers | 158 | — | 2 | 2002-11-02 |
| 576 | John H Correll | 158 | — | 2 | 1967-06-01 |
| 577 | DE Lucchi Well & Pump, Inc. | 157 | — | 5 | 1992-11-17 |
| 578 | Jim's Pump & Drilling | 157 | — | 5 | 1981-08-31 |
| 579 | E E Luhdorff | 155 | — | 9 | 1978-08-17 |
| 580 | Bass Drilling | 154 | — | 6 | 2020-04-27 |
| 581 | Scott Xxx PC Exploration Inc. | 154 | — | 22 | 2009-11-03 |
| 582 | Council Harold Drilling Co. | 154 | — | 4 | 1996-09-25 |
| 583 | Allmon C T Development Co. | 153 | — | 3 | 1992-04-01 |
| 584 | United Drilling | 152 | — | 2 | 1997-10-30 |
| 585 | Nation Well Drilling | 150 | — | 2 | — |
| 586 | San Joaquin Pump Co. | 150 | — | 1 | 1973-03-26 |
| 587 | R. S. DE Lucohi/ Delucchi Well & Pump | 149 | — | 3 | 2016-06-05 |
| 588 | Watson Well Drilling Inc. | 148 | — | 3 | 2018-12-20 |
| 589 | Weston E Dawson | 147 | — | 4 | 1980-01-17 |
| 590 | V J Mcgrew | 147 | — | 7 | 1963-12-26 |
| 591 | Midwest Water Well Contracting Inc. | 147 | — | 2 | 2007-08-10 |
| 592 | G Gakin Well Drilling | 147 | — | 5 | 1995-11-03 |
| 593 | Reeve Ralph Pump & Well Service | 145 | — | 2 | 2009-09-17 |
| 594 | Chapman Pump & Drilling Company | 145 | — | 2 | 1985-08-06 |
| 595 | Alexander Dean Water Well Drilling | 145 | — | 3 | 2001-02-09 |
| 596 | Morrison Drilling | 145 | — | 1 | 2008-02-19 |
| 597 | Aulman & Aulman | 145 | — | 2 | 1973-07-18 |
| 598 | John A Brandt | 143 | — | 5 | 1967-09-28 |
| 599 | S & S Water Well Drilling | 143 | — | 2 | 1999-09-15 |
| 600 | Castle Construction & Well Drilling Inc. | 142 | — | 22 | 2019-05-18 |
| 601 | Thomas E Mccaw Well Drilling | 141 | — | 2 | 2012-07-27 |
| 602 | Clifford Hudspeth | 140 | — | 1 | 1965-01-25 |
| 603 | County Well Drilling | 140 | — | 1 | 1986-12-20 |
| 604 | Taylor & Taber Drillers | 139 | — | 6 | 2003-07-15 |
| 605 | Larbre Well Driller | 138 | — | 2 | 1974-12-14 |
| 606 | Verne Guernsey | 137 | — | 2 | 1958-11-21 |
| 607 | Trc Solutions Inc. | 137 | — | 4 | 2008-08-21 |
| 608 | Crisp & Sons Well Drilling | 136 | — | 4 | 2003-06-26 |
| 609 | Paiste Bobby Joe | 136 | — | 2 | 2018-04-20 |
| 610 | Kermit Heise | 136 | — | 1 | 1991-03-25 |
| 611 | R R Kemp | 135 | — | 2 | 1966-03-19 |
| 612 | E Stewart Johnston For Valley Pump | 135 | — | 2 | 1981-06-22 |
| 613 | Allen's Drilling & Pump Service | 134 | — | 5 | 1986-10-21 |
| 614 | Soilprobe Inc. | 133 | — | 7 | 2018-12-14 |
| 615 | B & W Drilling | 132 | — | 8 | 1987-11-11 |
| 616 | Aqua Science Engineers Inc. | 131 | — | 7 | 1996-09-12 |
| 617 | Humboldt Drilling & Pump Co. | 131 | — | 17 | 2010-02-26 |
| 618 | Coastside Drilling & Pump Company | 131 | — | 3 | 1989-01-03 |
| 619 | Cowart Well Drilling | 131 | — | 4 | 2006-12-19 |
| 620 | Roscoe Moss Company | 130 | — | 17 | 2019-10-31 |
| 621 | Richardson Ernest Walker | 129 | — | 6 | 2000-08-10 |
| 622 | Turner Drilling | 129 | — | 3 | 2005-09-26 |
| 623 | Rettela & Pulliam | 129 | — | 2 | 1979-02-24 |
| 624 | Longwell & Taylor | 129 | — | 2 | 1978-11-09 |
| 625 | Capitola Pump & Supply Co. | 129 | — | 2 | 1974-03-06 |
| 626 | Thomas F Madsen | 128 | — | 4 | 1964-12-09 |
| 627 | Tide Tool & Engr. Co. | 128 | — | 5 | 1977-01-10 |
| 628 | Allison Sierra | 127 | — | 6 | 2020-08-03 |
| 629 | Ephraim Harris | 127 | — | 2 | 1970-09-23 |
| 630 | Joseph F. Leisek | 126 | — | 8 | 2006-08-24 |
| 631 | B & L Drilling Inc. | 126 | — | 1 | 1982-10-11 |
| 632 | Thayer Well Drilling | 125 | — | 3 | 2015-08-03 |
| 633 | Allen, Ken II Drilling | 125 | — | 3 | 2007-08-22 |
| 634 | M R Peck & Sons | 125 | — | 8 | 2006-06-07 |
| 635 | Nelson & Wilcox | 124 | — | 3 | 1969-10-21 |
| 636 | The Darrah Drilling Corp | 124 | — | 2 | 1980-10-25 |
| 637 | Modesto Well Drillers | 124 | — | 4 | 1969-03-11 |
| 638 | Jack Carrell Drilling Inc. | 123 | — | 5 | 1980-09-20 |
| 639 | Arthur F Loper | 123 | — | 4 | 1981-02-20 |
| 640 | Star Well Drilling & Pump Co. | 122 | — | 5 | 1962-01-15 |
| 641 | Central Coast Drilling | 122 | — | 3 | 2005-08-23 |
| 642 | Harich Construction | 122 | — | 3 | 2010-09-22 |
| 643 | Aquarius Well Drilling Inc. | 121 | — | 3 | 2019-10-25 |
| 644 | K F Guernsey | 119 | — | 4 | 1961-09-14 |
| 645 | Coastal Well Cleaning | 118 | — | 3 | 2003-01-26 |
| 646 | Aqua-Tek | 117 | — | 2 | 1992-03-20 |
| 647 | Mclean & Williams Well Drilling | 116 | — | 2 | 1978-11-14 |
| 648 | Portola Pump & Drilling | 116 | — | 4 | 1996-08-29 |
| 649 | Stockton Armature & Motor Works | 116 | — | 1 | 1961-04-10 |
| 650 | Gibson Well Drilling | 115 | — | 4 | 2016-10-30 |
| 651 | Dyna Drill International Inc. | 115 | — | 7 | 2010-03-14 |
| 652 | H C Steines | 115 | — | 3 | 1954-05-26 |
| 653 | L Van Winkle | 115 | — | 2 | 1958-07-01 |
| 654 | Schroeder Cary Contracting Inc. | 114 | — | 1 | 2000-06-25 |
| 655 | Ray Peterson Well Drilling | 114 | — | 1 | 1984-11-01 |
| 656 | Dodson Contracting Co. | 113 | — | 6 | 1980-08-18 |
| 657 | Montalvo Well & Pump Co. | 113 | — | 4 | 1990-10-10 |
| 658 | Xxx | 113 | — | 20 | 2002-08-26 |
| 659 | Clarence Woodbury | 113 | — | 2 | 1992-04-08 |
| 660 | Hunt Tom Drilling & Construction Co. | 112 | — | 5 | 1999-11-07 |
| 661 | Orsolini Well Drilling | 112 | — | 3 | 1980-04-19 |
| 662 | D L Rinker | 111 | — | 4 | 1961-12-27 |
| 663 | Carmel Valley Drilling & Engineering | 111 | — | 2 | 1986-05-01 |
| 664 | JC Drilling | 110 | — | 4 | 1992-11-12 |
| 665 | Coe Machine Works | 110 | — | 3 | 1957-02-26 |
| 666 | Jeffrey David Harra | 109 | — | 8 | 2019-04-16 |
| 667 | R Glick & Sons Water Wells | 109 | — | 2 | 1983-08-02 |
| 668 | C E Cates Well Drilling | 108 | — | 3 | 1993-04-09 |
| 669 | Evans Bros | 107 | — | 5 | 1970-07-11 |
| 670 | Tex Bassham Drilling | 107 | — | 4 | 1976-04-23 |
| 671 | Gilbert Drilling | 107 | — | 3 | 1991-12-24 |
| 672 | Howard Pump Company | 106 | — | 5 | 1995-02-07 |
| 673 | Agri-Cal Pump & Supply | 105 | — | 6 | 2003-05-06 |
| 674 | Hugh M Harris Drilling Company | 105 | — | 4 | 1996-02-17 |
| 675 | Fred W Porter & Sons | 105 | — | 5 | 2004-04-23 |
| 676 | Beale R B Inc. | 105 | — | 2 | 2005-09-06 |
| 677 | Haddon Drilling | 105 | — | 2 | 2013-11-12 |
| 678 | Ira M Earp Well Drilling | 104 | — | 3 | 2017-05-13 |
| 679 | Layne Environmental Services Inc. | 104 | — | 9 | 1994-02-02 |
| 680 | Jeffrey L Gross | 103 | — | 6 | 2010-06-03 |
| 681 | Bloomer E | 102 | — | 3 | 1978-12-18 |
| 682 | Brown Brothers Drilling | 102 | — | 4 | 2000-12-02 |
| 683 | Warden Drilling Co. | 102 | — | 3 | 1998-12-12 |
| 684 | V F Bassett | 101 | — | 7 | 1999-04-16 |
| 685 | Well Drilling | 100 | — | 5 | 2008-04-10 |
| 686 | Environmental Investigation Services, Inc. | 100 | — | 4 | 2013-11-12 |
| 687 | Leroy Tyler | 100 | — | 3 | 1971-06-30 |
| 688 | Midway Drilling Xxx | 100 | — | 4 | 1958-04-01 |
| 689 | Sierra Drilling Co. | 99 | — | 3 | 1970-08-14 |
| 690 | Conde A B | 99 | — | 1 | 1990-12-31 |
| 691 | O Hardcastle | 98 | — | 2 | 1963-09-15 |
| 692 | David Engel | 98 | — | 2 | 1973-02-01 |
| 693 | Hidden Valley Pump Systems Inc. | 98 | — | 2 | 2002-06-06 |
| 694 | W L Kirchgater | 98 | — | 4 | 1958-01-17 |
| 695 | Hydro Resources - West Inc. | 97 | — | 13 | 2015-10-19 |
| 696 | F P I Well Drilling Inc. | 96 | — | 6 | 2000-02-29 |
| 697 | Dail Rhoads Well Drilling | 95 | — | 3 | 1991-08-04 |
| 698 | Kimzey- Lee Well & Pump Co. | 95 | — | 2 | 1997-12-02 |
| 699 | Old Creek Drilling | 94 | — | 6 | 1994-06-17 |
| 700 | Nelson Well Drilling | 94 | — | 2 | 1985-11-02 |
| 701 | L. Wade Inc. | 93 | — | 9 | 2006-06-30 |
| 702 | Melvin L Lukins | 93 | — | 3 | 1977-08-30 |
| 703 | Southern Sierra Drilling | 92 | — | 5 | 2013-09-28 |
| 704 | Howard H. Ley | 92 | — | 1 | 1969-09-13 |
| 705 | Council Harold Drilling & Pump Service | 91 | — | 3 | 2000-03-25 |
| 706 | Cornerstone Pump & Well Inc. | 90 | — | 11 | 2009-10-27 |
| 707 | Modoc Drilling | 90 | — | 6 | 1998-12-02 |
| 708 | Rasmussen Well & Pump | 88 | — | 3 | 1972-12-15 |
| 709 | A & S Pump Service | 88 | — | 3 | 2016-10-10 |
| 710 | Brand & Water Wells | 88 | — | 2 | 1993-09-23 |
| 711 | R H Forney | 88 | — | 4 | 1972-12-24 |
| 712 | Barbour Corporation | 88 | — | 4 | 2009-04-14 |
| 713 | Gateway Drilling | 87 | — | 2 | 1994-08-30 |
| 714 | James P Treadway | 87 | — | 2 | 1952-05-29 |
| 715 | Tri State Water Well Drilling & Pumps Inc. | 87 | — | 3 | 2018-07-06 |
| 716 | F Lahorgue | 87 | — | 3 | 1974-10-22 |
| 717 | B R Purviance | 86 | — | 5 | 1957-09-08 |
| 718 | James W Imbach Well Drilling | 86 | — | 4 | 1968-03-28 |
| 719 | A R S Fracturing And Drilling Service | 86 | — | 3 | 2016-02-18 |
| 720 | Barnes Core Drlg | 86 | — | 8 | 1981-05-29 |
| 721 | R P Seay | 86 | — | 3 | 2001-08-28 |
| 722 | Stump Drilling Corp | 84 | — | 3 | 1991-07-24 |
| 723 | Fortune Drilling | 84 | — | 3 | 2018-06-01 |
| 724 | Olson Well Drilling | 84 | — | 3 | 2009-03-18 |
| 725 | Beeman Well Drilling | 84 | — | 2 | 1994-02-02 |
| 726 | Pipeline Industries-Drill Line Division | 84 | — | 3 | 1991-05-10 |
| 727 | Pacific Geoscience Inc. | 84 | — | 6 | 2010-05-17 |
| 728 | D & S Well Drilling | 84 | — | 4 | 1996-11-23 |
| 729 | Viking Drillers Inc. | 83 | — | 6 | 2009-09-28 |
| 730 | Koenig Enterprises | 83 | — | 7 | 2018-02-16 |
| 731 | Clark F Wells Corp | 83 | — | 4 | 1956-04-23 |
| 732 | Ase Drilling Inc. | 82 | — | 14 | 2013-08-09 |
| 733 | W E Blain | 82 | — | 7 | 1974-09-03 |
| 734 | Gary Fox & Co. | 82 | — | 3 | 2000-06-25 |
| 735 | L. E. Melville & Son, Inc. | 80 | — | 3 | 1997-09-12 |
| 736 | Murrieta Water Well Drilling Company | 80 | — | 3 | 1981-08-11 |
| 737 | Valley Pump & Dairy Systems Inc. | 79 | — | 4 | 1996-01-10 |
| 738 | Carrell & Canepa Drilling | 79 | — | 5 | 1979-01-07 |
| 739 | Ray Parnell Drilling Contractor | 79 | — | 3 | 1990-09-20 |
| 740 | Shoup Burton C Well Drilling And Pumps | 79 | — | 3 | 1997-09-11 |
| 741 | Points West Drilling | 78 | — | 12 | 2019-10-07 |
| 742 | Sydney Geels IT Corporation | 78 | — | 6 | 2006-05-08 |
| 743 | Oberto's Plumbing & Well Drilling | 78 | — | 3 | 1956-11-07 |
| 744 | Boggs Drilling | 78 | — | 2 | 2007-11-12 |
| 745 | Westside Drilling & Development Co. | 77 | — | 4 | 1966-10-03 |
| 746 | Clovis Well Drilling | 77 | — | 5 | 2014-08-06 |
| 747 | Criswell Drilling Co. | 77 | — | 2 | 1979-04-09 |
| 748 | Santa Rosa Drilling Co. | 77 | — | 5 | 1973-10-15 |
| 749 | Williams Bros Well Drilling | 77 | — | 2 | 1983-06-07 |
| 750 | Chino Valley Water Well Supply Inc. | 77 | — | 3 | 1968-03-07 |
| 751 | Garcia Well Drilling | 77 | — | 1 | 1984-07-20 |
| 752 | Hurd, Clarence | 77 | — | 3 | 2000-08-03 |
| 753 | Clark & Sons | 76 | — | 3 | 1984-08-04 |
| 754 | Enprobe Environental Direct Push & Drilling Services | 76 | — | 9 | 2013-11-08 |
| 755 | L & L Well Drilling | 76 | — | 3 | 1995-07-31 |
| 756 | M S Seebeck & Son | 75 | — | 8 | 1993-07-19 |
| 757 | Myers And Summers | 75 | — | 7 | 1993-10-25 |
| 758 | C C Scott | 75 | — | 6 | 1974-07-01 |
| 759 | Interstate Soils Sampling Inc. | 75 | — | 6 | 1996-01-13 |
| 760 | Orin F Gaskin & Edward F Swiecki Drilling | 75 | — | 2 | 1980-03-04 |
| 761 | Morris And Nelson | 75 | — | 2 | 1960-07-12 |
| 762 | M & M Well Drilling | 74 | — | 13 | 2018-09-18 |
| 763 | Meridian Drilling & Well Supply | 74 | — | 3 | 1975-12-08 |
| 764 | Julian Pump | 74 | — | 2 | 1982-02-27 |
| 765 | Miles Mark Well Drilling | 73 | — | 1 | 2019-12-10 |
| 766 | Canada Pump Sales & Service Inc. | 73 | — | 3 | 1979-10-12 |
| 767 | Nuner Well Drilling | 73 | — | 2 | 1979-07-25 |
| 768 | Landino Well Drilling | 73 | — | 3 | 2019-08-23 |
| 769 | Joe Souza | 72 | — | 4 | 1971-11-23 |
| 770 | Klein Knight Drlg Co. | 72 | — | 5 | 1967-12-11 |
| 771 | Graves & Graves Drilling | 72 | — | 3 | 1971-05-28 |
| 772 | Precision Drilling Co. | 71 | — | 12 | 2011-08-23 |
| 773 | Big Dog Drilling Inc. | 70 | — | 4 | 2019-06-25 |
| 774 | Bushnell Enterprises | 70 | — | 3 | 2020-07-24 |
| 775 | Fisher Well Drilling Company | 70 | — | 1 | 1982-12-03 |
| 776 | Chester A. Hollister | 70 | — | 1 | 1955-02-21 |
| 777 | A C Waller | 69 | — | 2 | 1957-09-11 |
| 778 | D C A Drilling And Construction Inc. | 69 | — | 4 | 2020-01-14 |
| 779 | T. Carmack | 69 | — | 2 | 1957-09-16 |
| 780 | Southern Deep Well Drilling Co. | 69 | — | 2 | 1986-06-25 |
| 781 | Robertson Bros | 68 | — | 8 | 1979-04-03 |
| 782 | Trinity Source Group Inc. | 67 | — | 7 | 2020-12-30 |
| 783 | Valley Home Drilling Co. | 67 | — | 4 | 1979-10-09 |
| 784 | Radulovich Well Drilling | 67 | — | 3 | 1989-03-04 |
| 785 | Tom Seay | 67 | — | 2 | 1956-10-17 |
| 786 | Scoggin Drilling Company | 67 | — | 2 | 1978-09-01 |
| 787 | J. T. Robinett & Sons | 67 | — | 3 | 2007-10-20 |
| 788 | Mcdougall's Well Drilling | 67 | — | 1 | 2000-02-23 |
| 789 | William L Myers | 66 | — | 3 | 1982-02-09 |
| 790 | Goehring Well Drilling | 66 | — | 3 | 1972-07-07 |
| 791 | Sprague Pump Co. | 66 | — | 3 | 1994-05-09 |
| 792 | Graham & Son Drilling Co. | 66 | — | 4 | 1983-04-15 |
| 793 | General Development | 65 | — | 3 | 1981-11-05 |
| 794 | Barber-Bridge Drilling Corp Ltd | 64 | — | 6 | 1958-08-06 |
| 795 | Harvey Gehrke | 63 | — | 3 | 1983-06-30 |
| 796 | Agri-Mall Irrigation | 63 | — | 2 | 1977-12-21 |
| 797 | Allen's Drilling | 63 | — | 4 | 2017-01-30 |
| 798 | Virgil H Chase | 63 | — | 1 | 1964-09-12 |
| 799 | Peerless Welding & Machine Shop | 63 | — | 4 | 1977-05-30 |
| 800 | Atec Drilling Co. | 63 | — | 4 | 2006-11-02 |
| 801 | Mazzetti & Company | 63 | — | 2 | 1990-11-15 |
| 802 | Clark Well Drilling Co. | 63 | — | 2 | 1974-07-26 |
| 803 | Matthew A. Bass | 62 | — | 4 | 2017-09-12 |
| 804 | A And V Pumps | 62 | — | 1 | 1977-10-21 |
| 805 | Reliance Drilling Co. | 62 | — | 2 | 1959-10-01 |
| 806 | Maxwell Drilling | 61 | — | 3 | 1995-10-12 |
| 807 | L R Hood | 61 | — | 2 | 1984-11-21 |
| 808 | Pioneer Drilling Inc. | 61 | — | 6 | 1989-08-22 |
| 809 | Robertson Drilling Co. | 61 | — | 3 | 1984-03-04 |
| 810 | Dan MC Mullen Well Drilling | 61 | — | 4 | 2015-11-16 |
| 811 | Lang Pump & Well Company | 60 | — | 4 | 2009-11-10 |
| 812 | ED Severin | 60 | — | 2 | 1971-04-27 |
| 813 | D P Well Drilling | 60 | — | 4 | 1985-05-24 |
| 814 | A & R Drilling | 60 | — | 8 | 2003-02-26 |
| 815 | Dell D Beck | 60 | — | 3 | 1956-11-30 |
| 816 | Santa Ynez Pump & Drilling | 60 | — | 1 | 2007-08-29 |
| 817 | Pierson Drilling | 59 | — | 5 | 1981-06-27 |
| 818 | Valley Water Well Drilling And Pump Co. | 59 | — | 3 | 1972-04-10 |
| 819 | Geo W Taylor Well Drlg Service | 58 | — | 4 | 1956-02-09 |
| 820 | Floyd's Well Drilling | 58 | — | 5 | 1981-01-23 |
| 821 | E & S Water Well Drilling | 58 | — | 2 | 1979-01-30 |
| 822 | Terry Well Drilling | 58 | — | 4 | 1972-12-18 |
| 823 | Wahl & Wood Drilling | 58 | — | 2 | 1988-10-23 |
| 824 | A J Kessel | 58 | — | 1 | 1969-05-07 |
| 825 | Mogle Brothers | 57 | — | 6 | 1957-01-08 |
| 826 | Hylton Drilling Co. | 57 | — | 4 | 1977-06-03 |
| 827 | Everett E. Mcbride Dba | 57 | — | 4 | 1984-08-17 |
| 828 | Patrick O Fortney | 57 | — | 3 | 1966-05-06 |
| 829 | Waldrop Drilling & Pump Co. Inc. | 57 | — | 2 | 1988-01-16 |
| 830 | A & B Water Well Drilling | 57 | — | 1 | 1991-02-09 |
| 831 | Stang Hydronics Inc. | 56 | — | 15 | 1984-08-01 |
| 832 | Carver Pump & Drilling Inc. | 56 | — | 3 | 1986-10-15 |
| 833 | Cates Lloyd Drilling | 56 | — | 2 | 1996-04-05 |
| 834 | Murray Well Drilling | 56 | — | 1 | 1979-11-30 |
| 835 | Ost-Air Drilling | 56 | — | 2 | 1983-07-15 |
| 836 | Robie Drilling Company | 56 | — | 1 | 1976-04-26 |
| 837 | H & L Drilling Company | 56 | — | 1 | 1979-04-15 |
| 838 | Mason Drilling | 56 | — | 1 | 1995-06-23 |
| 839 | Nero Ostenberg | 55 | — | 3 | 1961-08-19 |
| 840 | R Barrick For Great Sierra | 55 | — | 6 | 2011-08-25 |
| 841 | Charles Nyberg Well Drilling | 55 | — | 3 | 2005-05-10 |
| 842 | C W Drilling | 55 | — | 2 | 1991-04-10 |
| 843 | Rural Drilling Co. | 55 | — | 3 | 2020-04-01 |
| 844 | Bill Julian Pump | 55 | — | 2 | 1983-01-13 |
| 845 | Case Pacific Company | 55 | — | 2 | 2008-09-09 |
| 846 | Jack J Dunn | 54 | — | 3 | 1958-01-21 |
| 847 | Roche Well And Pump Company | 54 | — | 4 | 2016-05-24 |
| 848 | Martin & Son Water Well Drilling | 54 | — | 1 | 1979-07-27 |
| 849 | Shipps For Water Well | 54 | — | 3 | 1976-09-28 |
| 850 | Errin A Smith Drilling | 54 | — | 3 | 1997-10-25 |
| 851 | Delbert Wolfe | 54 | — | 1 | 1957-04-25 |
| 852 | Silva Bros | 53 | — | 1 | 1963-07-02 |
| 853 | Dexter Machinery | 53 | — | 6 | 1978-08-11 |
| 854 | Anderson G C Drilling & Pump | 53 | — | 8 | 2015-08-27 |
| 855 | Moffitt & Wells | 53 | — | 2 | 1963-12-02 |
| 856 | Mogle Drilling & Pump Company | 53 | — | 3 | 1960-04-22 |
| 857 | Bailey Drilling & Pump Inc. | 53 | — | 3 | 2009-07-08 |
| 858 | Peterson Drilling & Pump | 53 | — | 1 | 2002-12-30 |
| 859 | Leite Pump Sales | 52 | — | 1 | 1978-09-14 |
| 860 | Jvl Water Well Drilling | 52 | — | 3 | 2003-01-30 |
| 861 | J C Water Well Drilling | 52 | — | 5 | 2010-01-10 |
| 862 | Pipe Dreams Inc. | 52 | — | 2 | 1979-12-20 |
| 863 | Day, Sloan | 52 | — | 1 | 1987-09-23 |
| 864 | Welltest Inc. | 52 | — | 5 | 2014-04-21 |
| 865 | Mcrae K M Inc. | 51 | — | 2 | 2007-06-08 |
| 866 | Jack C Guernsey | 51 | — | 2 | 1967-02-17 |
| 867 | Paul Neville | 51 | — | 4 | 1962-08-10 |
| 868 | Great Basin Drilling | 51 | — | 2 | 2018-03-14 |
| 869 | Melvin A Mcfadden | 51 | — | 5 | 1970-08-08 |
| 870 | Gene Dyke | 51 | — | 2 | 1985-04-22 |
| 871 | Hacker's Pump Service | 51 | — | 5 | 1988-05-19 |
| 872 | George Chambers | 51 | — | 2 | 1976-03-28 |
| 873 | Vaughn Maynard & Sons | 51 | — | 2 | 1961-05-05 |
| 874 | Capitola Pump Inc. | 51 | — | 2 | 1988-11-04 |
| 875 | Bert Belknap | 50 | — | 3 | 1953-01-29 |
| 876 | Kennedy, Bryant, Drilling Co. | 50 | — | 2 | 1984-02-29 |
| 877 | Desert Oasis Drilling | 50 | — | 1 | 1989-08-30 |
| 878 | Ben Barrow Company | 49 | — | 8 | 1973-04-26 |
| 879 | Van Loon Jack | 49 | — | 3 | 2018-01-26 |
| 880 | Janco Pump & Equipment Co. | 49 | — | 1 | 1982-07-29 |
| 881 | Hall Construction Company | 49 | — | 2 | 1990-06-10 |
| 882 | Campbell Drilling | 49 | — | 1 | 2003-10-03 |
| 883 | Harvey Shoup | 49 | — | 1 | 1973-12-10 |
| 884 | Robert Haylock "RH" Well Drilling | 48 | — | 4 | 2017-03-20 |
| 885 | Howk Well & Equipment Co. | 48 | — | 5 | 1977-06-15 |
| 886 | Xxx Soils Exploration SV | 48 | — | 13 | 1997-02-01 |
| 887 | Joe W Baker | 48 | — | 3 | 1968-07-21 |
| 888 | CR Well Drilling | 48 | — | 2 | 2010-06-02 |
| 889 | ED Owens & Son Drilling Co. | 48 | — | 5 | 1968-12-11 |
| 890 | Teredon Company | 48 | — | 4 | 1976-03-08 |
| 891 | Murphys Well Drilling | 48 | — | 1 | 1989-05-03 |
| 892 | Steven E Foster | 48 | — | 2 | 2018-03-30 |
| 893 | J Lippi & Son | 47 | — | 3 | 1956-08-28 |
| 894 | H W Bence | 47 | — | 4 | 1968-08-20 |
| 895 | A J Oberto | 47 | — | 3 | 1954-03-05 |
| 896 | E Larsen | 47 | — | 3 | 1978-07-26 |
| 897 | Claude E Kelley | 47 | — | 2 | 1955-02-11 |
| 898 | J. R. Greenlee | 47 | — | 1 | 1967-10-19 |
| 899 | Santa Ynez Valley Well Service | 47 | — | 2 | 1988-05-21 |
| 900 | Moerlien's Plumbing & Electric Shop | 47 | — | 2 | 1993-10-06 |
| 901 | Groundwater Technology | 46 | — | 9 | 1994-04-13 |
| 902 | Rea Construction | 46 | — | 5 | 1989-04-11 |
| 903 | Trihydro Corporation | 46 | — | 6 | 2010-01-16 |
| 904 | Joey's Well Drilling & Construction | 46 | — | 3 | 2017-07-05 |
| 905 | Moore Twining Associates Inc. | 46 | — | 7 | 2019-10-03 |
| 906 | Lawand Drilling | 46 | — | 2 | 1985-04-12 |
| 907 | Melton Drilling Co. | 46 | — | 5 | 2000-06-03 |
| 908 | Dales Drilling | 46 | — | 2 | 1989-02-10 |
| 909 | Roy V Alsop | 46 | — | 2 | 1995-10-18 |
| 910 | Nunes Well Service | 46 | — | 2 | 1966-10-08 |
| 911 | Hiram G Smith | 46 | — | 2 | 1958-02-20 |
| 912 | Patrick O Fortney & Son | 46 | — | 2 | 1966-06-07 |
| 913 | Robert Garcia Well Drilling & Pump Co. | 46 | — | 2 | 1963-07-31 |
| 914 | William Porter Well Drilling | 46 | — | 3 | 1977-09-15 |
| 915 | Alva E Morgan | 45 | — | 4 | 2004-09-30 |
| 916 | Acton Well Drilling | 45 | — | 2 | 1963-05-28 |
| 917 | Reuben J Boe Water Well Drilling | 45 | — | 2 | 1969-04-15 |
| 918 | Herzog & Associates | 45 | — | 1 | 2007-04-15 |
| 919 | H Allen Herr Domestic Well Drilling | 45 | — | 3 | 1998-08-05 |
| 920 | Modern Technology Resources Inc. | 44 | — | 12 | 2018-09-11 |
| 921 | L M Quinn | 44 | — | 2 | 1958-06-15 |
| 922 | Saunders Brothers | 44 | — | 4 | 1970-12-09 |
| 923 | J W Evans & Sons | 44 | — | 3 | 2000-07-06 |
| 924 | Baliel Drilling | 44 | — | 1 | 1983-01-02 |
| 925 | George Stamp | 44 | — | 2 | 1960-10-11 |
| 926 | Premier Drilling Company | 43 | — | 3 | 2021-08-07 |
| 927 | S I Guardino | 43 | — | 9 | 1954-06-23 |
| 928 | Cobb Well Drilling | 43 | — | 1 | 1981-07-06 |
| 929 | Bishop Electric | 43 | — | 2 | 1989-05-04 |
| 930 | Universal Pump & Supply Inc. | 43 | — | 2 | 1992-02-10 |
| 931 | Stockton Pump & Machine Co. | 43 | — | 1 | 1986-10-31 |
| 932 | Ronald L Clark Clark Water Svc | 43 | — | 3 | 1993-05-30 |
| 933 | Gullord Arthur Water Well Drilling | 42 | — | 2 | 1992-04-10 |
| 934 | K & D Drilling | 42 | — | 2 | 1983-01-26 |
| 935 | Kelley Mike | 42 | — | 1 | 1977-11-25 |
| 936 | Applied Hydrogeologic Consultants Inc. | 42 | — | 1 | 1992-09-02 |
| 937 | Zeno Strout | 42 | — | 1 | 1967-11-10 |
| 938 | C & M Drilling Co. | 41 | — | 6 | 2003-11-14 |
| 939 | Abajian Seth Well Drilling | 41 | — | 5 | 1994-07-28 |
| 940 | Arthur's Well Drilling | 41 | — | 7 | 1976-05-15 |
| 941 | Hoffman J F Well Driller | 41 | — | 3 | 1978-06-23 |
| 942 | Western Rentals & Sales | 41 | — | 1 | 1969-05-17 |
| 943 | John Panero And Carl Mcleister | 41 | — | 2 | 1965-11-03 |
| 944 | Cullum Drilling & Pump Service | 40 | — | 2 | 1972-10-13 |
| 945 | Machado Inc. | 40 | — | 2 | 1980-02-08 |
| 946 | Westex | 40 | — | 6 | 2005-12-04 |
| 947 | N A F F C O Pump And Well Inc. | 40 | — | 4 | 2020-01-08 |
| 948 | Gamoian & Reyes Enterprises Dba A & M Well Drilling | 40 | — | 1 | 1978-05-16 |
| 949 | All American Water Supply OF California Inc. | 40 | — | 10 | 2012-08-20 |
| 950 | Atwater Well Drilling | 40 | — | 5 | 2021-04-06 |
| 951 | Beckett Drilling & Pump Service | 40 | — | 2 | 2018-02-05 |
| 952 | George Putman | 40 | — | 2 | 1958-11-25 |
| 953 | Suffdy Earl Ramey | 40 | — | 1 | 1960-06-11 |
| 954 | Pollock's Drilling & Pump Service | 39 | — | 6 | 1999-06-15 |
| 955 | Andy Noblin | 39 | — | 4 | 1967-05-21 |
| 956 | John W. Nairn | 39 | — | 3 | 1979-03-01 |
| 957 | C D Thompson | 39 | — | 1 | 1956-09-21 |
| 958 | Furlong Well Drilling | 39 | — | 1 | 1982-06-17 |
| 959 | Cal Drilling | 39 | — | 1 | 2016-10-20 |
| 960 | Louis A Wood Co. | 38 | — | 3 | 2009-06-25 |
| 961 | Lovejoy Sherwood JR | 38 | — | 3 | 2011-02-12 |
| 962 | Dudley Newton JR | 38 | — | 4 | 2007-09-21 |
| 963 | Environmental West Drilling | 38 | — | 7 | 2008-10-21 |
| 964 | Deer Creek Drilling Inc. | 38 | — | 3 | 2019-04-04 |
| 965 | FA Moves | 38 | — | 1 | 1956-08-11 |
| 966 | Hew Drilling Co. | 38 | — | 3 | 2010-09-03 |
| 967 | Tom's Well Drilling And Company | 38 | — | 1 | 2016-11-30 |
| 968 | Bsk Associates | 37 | — | 8 | 2000-04-19 |
| 969 | Dan's Water Well & Pump Service Inc. | 37 | — | 6 | 2017-08-28 |
| 970 | R E S N A | 37 | — | 4 | 2007-11-14 |
| 971 | Aqua Drilling & Well Service Inc. | 37 | — | 7 | 2002-04-03 |
| 972 | Delap & Sons | 37 | — | 2 | 1996-06-03 |
| 973 | Davis Machine Shop Inc. | 37 | — | 5 | 2020-03-03 |
| 974 | Keener Exploration Drilling Co. | 37 | — | 7 | 1973-03-25 |
| 975 | Arthur T Ball | 37 | — | 3 | 1958-07-22 |
| 976 | Collum Drilling Company | 37 | — | 6 | 1965-03-27 |
| 977 | William B Zuver | 37 | — | 2 | 1998-03-23 |
| 978 | James And Wilkerson Drilling | 37 | — | 3 | 1974-07-17 |
| 979 | Mclean & Williams Inc. | 37 | — | 1 | 2015-12-09 |
| 980 | Errol A Smith Drilling | 37 | — | 4 | 1990-03-30 |
| 981 | Carmack & Stephenson | 37 | — | 2 | 1951-12-13 |
| 982 | Alberts Pump & Well Service | 37 | — | 1 | 1982-08-16 |
| 983 | California Well Drilling & Pump Co. | 37 | — | 3 | 1978-02-28 |
| 984 | Harry Ross | 37 | — | 2 | 1978-10-06 |
| 985 | Great Western Company | 37 | — | 1 | 1978-06-19 |
| 986 | L Larson | 36 | — | 4 | 1969-04-18 |
| 987 | Peaker Paul | 36 | — | 3 | 1978-11-10 |
| 988 | Fugro Usa Land Inc. | 36 | — | 4 | 2018-05-23 |
| 989 | Jdk Drilling Inc. | 36 | — | 1 | 2013-07-12 |
| 990 | Geo S Bandy | 36 | — | 2 | 1964-10-04 |
| 991 | Valley Pump & Supply | 36 | — | 1 | 1957-10-14 |
| 992 | Arrowhead Water Well Drilling | 36 | — | 2 | 1992-08-03 |
| 993 | B & F Drilling | 35 | — | 10 | 1996-03-27 |
| 994 | E H Bradfield & Son | 35 | — | 1 | 1950-12-20 |
| 995 | Roy S Devoe | 35 | — | 1 | 1972-10-13 |
| 996 | L E Tomson | 35 | — | 3 | 1954-06-26 |
| 997 | T C B Well Drilling Co. | 35 | — | 2 | 1993-08-07 |
| 998 | Ralph A Johnson | 35 | — | 1 | 1967-09-10 |
| 999 | Levy Matthews & Son | 35 | — | 5 | 2007-04-29 |
| 1000 | M & W Pumps Inc. | 35 | — | 3 | 2011-06-01 |
| 1001 | Walter G Noack & Son Inc. | 35 | — | 1 | 1976-04-14 |
| 1002 | William A Duer | 35 | — | 1 | 1974-06-06 |
| 1003 | Mcgann | 34 | — | 5 | 1990-10-26 |
| 1004 | Hutton Drilling | 34 | — | 3 | 2015-10-21 |
| 1005 | Larry Herman Drilling | 34 | — | 4 | 2012-01-16 |
| 1006 | Gerald Foster | 34 | — | 2 | 1952-05-09 |
| 1007 | Solomon Excavation Inc. | 34 | — | 1 | 2010-08-15 |
| 1008 | Kenn Alexanderson | 33 | — | 1 | 1991-10-15 |
| 1009 | Baker Scott | 33 | — | 5 | 2010-09-03 |
| 1010 | Water Well Drilling Ernest E Bartell | 33 | — | 2 | 1974-01-30 |
| 1011 | Shipps For Water Well Drilling | 33 | — | 6 | 2021-04-12 |
| 1012 | The Pump Shop Inc. | 33 | — | 2 | 1971-04-14 |
| 1013 | H2o Producers | 33 | — | 2 | 1992-04-21 |
| 1014 | A A A Pump And Well Drilling | 33 | — | 1 | 2005-05-11 |
| 1015 | Thomas L Manos | 33 | — | 1 | 1976-01-30 |
| 1016 | Widner Arthur Grover | 33 | — | 1 | 2001-12-10 |
| 1017 | Geoloop Drilling/Tom Moreland | 32 | — | 8 | 2014-04-23 |
| 1018 | Cofferdam Unwatering Corporation | 32 | — | 13 | 1985-03-14 |
| 1019 | Sam J Lawand | 32 | — | 2 | 1951-07-09 |
| 1020 | John H. And Jack A. Correll | 32 | — | 3 | 1958-12-21 |
| 1021 | Hail Drlg | 32 | — | 1 | 1992-12-17 |
| 1022 | Lackey Bob Drilling | 32 | — | 2 | 2016-05-05 |
| 1023 | Tcb Well Drilling | 32 | — | 3 | 1991-10-09 |
| 1024 | H A Moore Drlng | 32 | — | 4 | 1978-12-08 |
| 1025 | Well Tech | 32 | — | 5 | 1989-02-05 |
| 1026 | Big Valley Drilling & Exploration Co. | 32 | — | 6 | 1980-08-15 |
| 1027 | E R Young | 32 | — | 1 | 1953-07-18 |
| 1028 | Pacific West Services | 32 | — | 1 | 2019-08-23 |
| 1029 | W T Page | 31 | — | 2 | 1956-05-06 |
| 1030 | Murphy Pump & Supply | 31 | — | 5 | 1994-03-18 |
| 1031 | S D Drilling Inc. | 31 | — | 5 | 2011-08-29 |
| 1032 | Staal, Gardner, & Dunne, Inc. | 31 | — | 3 | 1996-03-02 |
| 1033 | All Well Drilling And Pump Service | 31 | — | 2 | 2016-01-28 |
| 1034 | United Drilling & Exploration Co. | 31 | — | 2 | 2005-03-16 |
| 1035 | Cen Cal Drilling Inc. | 31 | — | 2 | 2016-11-22 |
| 1036 | Morris Drilling | 31 | — | 1 | 1973-05-02 |
| 1037 | Corder Drilling | 31 | — | 2 | 2007-04-26 |
| 1038 | Cliff Steele & Van Norman | 31 | — | 1 | 1953-08-28 |
| 1039 | J P Pilkens Water Well Drlg | 31 | — | 2 | 2005-10-10 |
| 1040 | Beeler Brothers | 31 | — | 2 | 1961-06-30 |
| 1041 | Bmt Well Drilling Co. | 31 | — | 1 | 1995-06-01 |
| 1042 | Bosearello Enterprises | 30 | — | 5 | 1979-11-20 |
| 1043 | Taber Consultants | 30 | — | 5 | 2014-06-04 |
| 1044 | U S Geological Survey | 30 | — | 16 | 2014-08-04 |
| 1045 | Whiting Well Drilling | 30 | — | 2 | 2006-11-10 |
| 1046 | DP Drilling | 30 | — | 5 | 1978-01-01 |
| 1047 | Keeler Drlg Co. | 30 | — | 6 | 1977-08-10 |
| 1048 | Scoggin Drilling & Dev Co. | 30 | — | 2 | 1955-10-01 |
| 1049 | Mclaren Environmental Engineering | 30 | — | 7 | 2006-06-30 |
| 1050 | Kechichian Well Drilling | 30 | — | 1 | 2010-06-04 |
| 1051 | North State Well & Pump | 30 | — | 5 | 1993-07-01 |
| 1052 | Daniel F Anderson | 30 | — | 2 | 1955-12-16 |
| 1053 | Roche Drilling Services Inc. | 29 | — | 3 | 2018-02-09 |
| 1054 | Riley W Rummans | 29 | — | 1 | 1969-04-02 |
| 1055 | Morris A Balderman | 29 | — | 3 | 1999-12-27 |
| 1056 | Modern Drilling | 29 | — | 3 | 2010-06-26 |
| 1057 | Directed Technologies Drilling Inc. | 29 | — | 4 | 2019-12-13 |
| 1058 | US Drilling | 29 | — | 2 | 2017-03-07 |
| 1059 | Castlio Drilling Co. | 29 | — | 3 | 1991-10-23 |
| 1060 | Ken Hickman Well Drilling | 29 | — | 3 | 1981-01-06 |
| 1061 | W L Watkins | 29 | — | 2 | 1972-06-15 |
| 1062 | Cardno Inc. | 28 | — | 2 | 2020-03-26 |
| 1063 | Vironex Technical Services LLC | 28 | — | 2 | 2017-04-20 |
| 1064 | Aaa Pump | 28 | — | 8 | 2009-04-16 |
| 1065 | Don's Drilling Company | 28 | — | 2 | 2016-01-08 |
| 1066 | William W Tarbutton | 28 | — | 2 | 1953-06-15 |
| 1067 | Danville Well Drilling Co. | 27 | — | 2 | 1978-01-30 |
| 1068 | Waterwell Plus | 27 | — | 7 | 2015-12-31 |
| 1069 | Harrell's | 27 | — | 3 | 1980-12-06 |
| 1070 | W N (Bill) Stout | 27 | — | 3 | 1957-05-31 |
| 1071 | Gungle Drilling | 27 | — | 3 | 1993-07-17 |
| 1072 | Cowart & Dix | 27 | — | 2 | 1951-04-21 |
| 1073 | Garrison Bros | 27 | — | 3 | 1990-10-08 |
| 1074 | George Azevedo | 27 | — | 2 | 1976-09-15 |
| 1075 | Ace Drilling & Pump Co. | 27 | — | 3 | 1991-08-26 |
| 1076 | J R Gross Wells & Pumps | 27 | — | 1 | 2016-02-22 |
| 1077 | Teg - Northern California Inc. | 27 | — | 2 | 2013-01-16 |
| 1078 | F M Van Norman | 27 | — | 1 | 1978-08-12 |
| 1079 | Webb Drilling Company | 27 | — | 1 | 1984-04-26 |
| 1080 | Lively, L J, And M | 27 | — | 2 | 1948-07-01 |
| 1081 | Foothill Drilling | 26 | — | 6 | 2015-05-23 |
| 1082 | Quentin Y Thayer | 26 | — | 2 | 1967-06-23 |
| 1083 | Toxicological & Environmental Associates Inc. | 26 | — | 1 | 2014-09-20 |
| 1084 | Hill Drilling | 26 | — | 2 | 1975-04-04 |
| 1085 | Terry Mccormick | 26 | — | 3 | 1979-02-23 |
| 1086 | Nor-Cal Pump & Well Service | 26 | — | 10 | 2013-09-27 |
| 1087 | Butte Pump Service | 26 | — | 5 | 2003-12-30 |
| 1088 | Kulchin-Condon & Asso | 26 | — | 1 | 2000-02-08 |
| 1089 | Harry Crinklaw | 26 | — | 1 | 1961-10-30 |
| 1090 | Canada Bros | 25 | — | 2 | 2006-11-06 |
| 1091 | R & M Drilling | 25 | — | 2 | 2018-08-01 |
| 1092 | Affordable Waterwell Drilling & Pump Maintenance | 25 | — | 3 | 2017-01-19 |
| 1093 | R Cruse Drilling And Well Service | 25 | — | 3 | 2007-03-07 |
| 1094 | California Waterwell Serv | 25 | — | 1 | 1984-12-25 |
| 1095 | Miller & Johnson | 25 | — | 2 | 1966-08-13 |
| 1096 | Russ Ervin-Well Drilling | 25 | — | 2 | 1966-07-14 |
| 1097 | C Johnson Well Drilling & Pump | 25 | — | 2 | 1967-09-28 |
| 1098 | P/D Drilling Co. | 25 | — | 4 | 1984-06-23 |
| 1099 | Gary D Lowe | 25 | — | 2 | 1985-02-28 |
| 1100 | Sixkiller Rufus Henry Drilling | 25 | — | 2 | 2015-07-24 |
| 1101 | Runnels E L Well Drilling | 25 | — | 1 | 1986-10-09 |
| 1102 | Livermore Pump | 25 | — | 1 | 1993-03-26 |
Best well drillers by county
County-level rankings — who actually drills where, by wells on record.
- Alameda County (174)
- Alpine County (28)
- Amador County (78)
- Butte County (41)
- Calaveras County (82)
- Colusa County (30)
- Contra Costa County (147)
- Del Norte County (6)
- El Dorado County (125)
- Fresno County (274)
- Glenn County (28)
- Humboldt County (19)
- Imperial County (49)
- Inyo County (77)
- Kern County (228)
- Kings County (147)
- Lake County (25)
- Lassen County (18)
- Los Angeles County (192)
- Madera County (217)
- Marin County (78)
- Mariposa County (68)
- Mendocino County (104)
- Merced County (179)
- Modoc County (9)
- Mono County (69)
- Monterey County (147)
- Napa County (104)
- Nevada County (99)
- Orange County (108)
- Placer County (155)
- Plumas County (67)
- Riverside County (202)
- Sacramento County (203)
- San Benito County (94)
- San Bernardino County (250)
- San Diego County (151)
- San Francisco County (53)
- San Joaquin County (185)
- San Luis Obispo County (101)
- San Mateo County (116)
- Santa Barbara County (150)
- Santa Clara County (210)
- Santa Cruz County (111)
- Shasta County (30)
- Sierra County (64)
- Siskiyou County (19)
- Solano County (126)
- Sonoma County (152)
- Stanislaus County (134)
- Sutter County (94)
- Tehama County (32)
- Trinity County (16)
- Tulare County (233)
- Tuolumne County (52)
- Ventura County (147)
- Yolo County (133)
- Yuba County (121)
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