| 1 | Sargent Drilling | 145 | 342 | 442 |
| 2 | Cascade Well Co. | 116 | 303 | 371 |
| 3 | All American Drilling Inc. | 109 | 109 | 144 |
| 4 | Taylor Drilling And Pump Inc. | 94 | 254 | 341 |
| 5 | Filipponi-Thompson Drilling Inc. | 49 | 542 | 2,133 |
| 6 | Coast Drilling Inc. | 38 | 75 | 278 |
| 7 | Sar Construction | 32 | 33 | 47 |
| 8 | Sierra Exploration Drilling Co. Inc. | 20 | 581 | 802 |
| 9 | Pacific Coast Well Drilling Inc. | 20 | 63 | 337 |
| 10 | Farwest Corrosion Control Company | 17 | 58 | 2,649 |
| 11 | D & D Pumps | 16 | 16 | 46 |
| 12 | Gregg Drilling & Testing Inc. | 14 | 17 | 4,828 |
| 13 | Cascade Drilling L P | 12 | 96 | 2,827 |
| 14 | National E W P Inc. | 10 | 12 | 431 |
| 15 | Cascade Drilling LP | 10 | 11 | 826 |
| 16 | Abundant Water Wells | 8 | 20 | 173 |
| 17 | Corrpro Companies Inc. | 8 | 8 | 737 |
| 18 | Business Midstate Drillers | 8 | 8 | 117 |
| 19 | Kleinfelder Inc. | 8 | 8 | 54 |
| 20 | Hansen-Welldo-Service Inc. | 7 | 11 | 138 |
| 21 | Farm Pump And Irrigation Company Inc. | 6 | 19 | 451 |
| 22 | Barbour Well Inc. | 6 | 6 | 32 |
| 23 | Bc2 Environmental LLC | 5 | 9 | 416 |
| 24 | Enloe Well Drilling | 4 | 90 | 279 |
| 25 | Miller Drilling Co. | 4 | 87 | 1,775 |
| 26 | Vics Well Drilling Inc. | 4 | 4 | 337 |
| 27 | American Construction And Supply Inc. | 3 | 6 | 1,685 |
| 28 | Camp S A Pump Company | 3 | 5 | 497 |
| 29 | A B C Liovin Drilling Inc. | 3 | 3 | 1,281 |
| 30 | South Valley Pump & Drilling | 3 | 3 | 69 |
| 31 | J & H Drilling Co. Inc. | 2 | 18 | 978 |
| 32 | Zim Industries Inc. Dba Bakersfield Well & Pump Co. | 2 | 17 | 1,716 |
| 33 | Maggiora Bros Drilling Inc. | 2 | 15 | 4,674 |
| 34 | Bertram Drilling Inc. | 2 | 4 | 1,171 |
| 35 | Well Industries Inc. | 2 | 2 | 558 |
| 36 | Eaton Drilling Co. LLC | 2 | 2 | 3,793 |
| 37 | Alexander Brothers | 1 | 897 | 903 |
| 38 | S/G Testing Laboratories Inc. | 1 | 123 | 187 |
| 39 | Beks Acquisition Inc. | 1 | 8 | 465 |
| 40 | Shipps For Water Well Drilling | 1 | 7 | 33 |
| 41 | D C A Drilling And Construction Inc. | 1 | 2 | 69 |
| 42 | Gregg Drilling LLC | 1 | 1 | 558 |
| 43 | Bradley & Sons Inc. | 1 | 1 | 3,627 |
| 44 | L O Lynch Quality Wells & Pumps Inc. | 1 | 1 | 3,373 |
| 45 | Arsenal Well Drilling Inc. | 1 | 1 | 234 |
| 46 | Arthur & Orum Well Drilling Inc. | 1 | 1 | 3,219 |
| 47 | Wildrose Drilling LLC | 1 | 1 | 102 |
| 48 | National Corrosion | 1 | 1 | 28 |
| 49 | Island Drilling | 1 | 1 | 221 |
| 50 | All Well Drilling And Pump Service | 1 | 1 | 31 |
| 51 | Floyd V Wells | — | 1,401 | 1,771 |
| 52 | Mel Meyer | — | 475 | 101,127 |
| 53 | C. J Longwell | — | 136 | 217 |
| 54 | E Stewart Johnston For Valley Pump | — | 129 | 135 |
| 55 | Longwell & Taylor | — | 107 | 129 |
| 56 | Filipponi & Thompson Drilling Company | — | 102 | 303 |
| 57 | Clark F Wells Corp | — | 70 | 83 |
| 58 | Chester A. Hollister | — | 70 | 70 |
| 59 | Southern Deep Well Drilling Co. | — | 66 | 69 |
| 60 | Santa Ynez Pump & Drilling | — | 60 | 60 |
| 61 | Old Creek Drilling | — | 59 | 94 |
| 62 | Pacific Geoscience Inc. | — | 52 | 84 |
| 63 | George Chamberlain | — | 49 | 256 |
| 64 | Gilbert Drilling | — | 45 | 107 |
| 65 | Santa Ynez Valley Well Service | — | 45 | 47 |
| 66 | Valley Pump & Supply | — | 36 | 36 |
| 67 | American Technological Drilling Service Inc. | — | 35 | 1,385 |
| 68 | Midway Drilling & Pump Company | — | 35 | 753 |
| 69 | Beylik Drilling & Pump Service | — | 33 | 1,267 |
| 70 | Cascade Drilling Inc. - California | — | 32 | 3,167 |
| 71 | M & W Pumps Inc. | — | 29 | 35 |
| 72 | Rottman Drilling Co. | — | 21 | 1,331 |
| 73 | Layne Christensen Company | — | 20 | 2,362 |
| 74 | Whitten Pumps Inc. | — | 17 | 874 |
| 75 | Terry Mccormick | — | 16 | 26 |
| 76 | Valley Well Drilling LP | — | 15 | 410 |
| 77 | Datum Exploration Inc. | — | 15 | 223 |
| 78 | West Hazmat Drilling Corp | — | 14 | 1,702 |
| 79 | W D C Exploration & Wells | — | 13 | 2,421 |
| 80 | Myers Brothers Inc. | — | 13 | 796 |
| 81 | Bakersfield Pump Co. | — | 13 | 303 |
| 82 | Ben Barrow Company | — | 13 | 49 |
| 83 | H-F Drilling, Inc. | — | 12 | 618 |
| 84 | Trunnell Wells & Pumps | — | 12 | 384 |
| 85 | Klein Knight Drlg Co. | — | 12 | 72 |
| 86 | Cruse Drilling Co. | — | 11 | 341 |
| 87 | Robert Haylock "RH" Well Drilling | — | 11 | 48 |
| 88 | Myers Reverse, Inc. | — | 10 | 2,389 |
| 89 | Myers Brothers Well Drilling Inc. | — | 9 | 2,865 |
| 90 | DE LA Grange & Sons Inc. | — | 9 | 263 |
| 91 | Rauch Drilling Company Inc. | — | 9 | 520 |
| 92 | Robertson Bros | — | 9 | 68 |
| 93 | Arrowhead Group | — | 7 | 244 |
| 94 | B & W Drilling | — | 7 | 132 |
| 95 | Council Harold Drilling & Pump Service | — | 7 | 91 |
| 96 | Barbour Corporation | — | 7 | 88 |
| 97 | Howard Pump Inc. A California Corporation | — | 6 | 1,650 |
| 98 | Moss Roscoe Company | — | 6 | 1,220 |
| 99 | C. Cruse Drilling | — | 6 | 301 |
| 100 | Teredon Company | — | 6 | 48 |
| 101 | Best Drilling And Pump Inc. | — | 5 | 248 |
| 102 | Trudell Drilling Co. | — | 5 | 707 |
| 103 | Beylik Drilling Inc. | — | 5 | 174 |
| 104 | Starr Drilling And Pump Co. | — | 4 | 875 |
| 105 | Corrosion Technology Inc. | — | 4 | 169 |
| 106 | D W Slocum Water Well Drilling | — | 3 | 217 |
| 107 | SO Cal Pump And Well Drilling | — | 3 | 158 |
| 108 | Roscoe Moss Company | — | 3 | 130 |
| 109 | John W. Nairn | — | 3 | 39 |
| 110 | Sixkiller Drilling | — | 2 | 26 |
| 111 | Boart Longyear Company | — | 2 | 172 |
| 112 | MC Dougall's Well Drilling Inc. | — | 2 | 1,345 |
| 113 | Jack Jones Wells & Pumps | — | 2 | 1,145 |
| 114 | Diversified Exploration Co. Inc. | — | 2 | 751 |
| 115 | Big Valley Drilling | — | 2 | 294 |
| 116 | Layne-Western Co. Inc. | — | 2 | 255 |
| 117 | Central Coast Drilling | — | 2 | 122 |
| 118 | Stang Hydronics Inc. | — | 2 | 56 |
| 119 | Reuben J Boe Water Well Drilling | — | 2 | 45 |
| 120 | H A Moore Drlng | — | 2 | 32 |
| 121 | Canepa And Sons Inc. | — | 1 | 3,173 |
| 122 | Johnson Drilling Co. | — | 1 | 11,865 |
| 123 | Fain Drilling & Pump Co. Inc. | — | 1 | 3,029 |
| 124 | Bryant Pump & Drilling Company | — | 1 | 1,000 |
| 125 | Bill Belknap | — | 1 | 2,758 |
| 126 | Pitcher Drilling Co. | — | 1 | 1,232 |
| 127 | Aqua Engineering | — | 1 | 641 |
| 128 | Boetsch Well Drilling And Pump Service | — | 1 | 522 |
| 129 | Bill Rambeau Pump & Well Drilling | — | 1 | 288 |
| 130 | Clark Well Inc. | — | 1 | 273 |
| 131 | Leonard A Anderson Company | — | 1 | 203 |
| 132 | D-R Water Well Drill | — | 1 | 196 |
| 133 | Don Redfeairn Drilling Co. | — | 1 | 186 |
| 134 | Ralph E Anderson | — | 1 | 171 |
| 135 | Golden Empire Drilling | — | 1 | 168 |
| 136 | Council Harold Drilling Co. | — | 1 | 154 |
| 137 | Soilprobe Inc. | — | 1 | 133 |
| 138 | Xxx | — | 1 | 113 |
| 139 | Layne Environmental Services Inc. | — | 1 | 104 |
| 140 | Barnes Core Drlg | — | 1 | 86 |
| 141 | Ray Parnell Drilling Contractor | — | 1 | 79 |
| 142 | A & R Drilling | — | 1 | 60 |
| 143 | Pierson Drilling | — | 1 | 59 |
| 144 | Hylton Drilling Co. | — | 1 | 57 |
| 145 | Shipps For Water Well | — | 1 | 54 |
| 146 | Environmental West Drilling | — | 1 | 38 |
| 147 | Arrowhead Water Well Drilling | — | 1 | 36 |
| 148 | L E Tomson | — | 1 | 35 |
| 149 | Gungle Drilling | — | 1 | 27 |
| 150 | Sixkiller Rufus Henry Drilling | — | 1 | 25 |