| 1 | Rumsey / Lang Well Drilling & Pumps Inc. | 479 | 683 | 729 |
| 2 | Gary C Tanko Well Drilling Inc. | 185 | 3,772 | 12,022 |
| 3 | Triangle Well Drilling | 174 | 2,848 | 2,894 |
| 4 | Diamond Well Drilling Company Inc. | 17 | 272 | 1,150 |
| 5 | Bruce Mackay Pump & Well Service Inc. | 11 | 20 | 260 |
| 6 | Top Hat Well Drilling | 10 | 10 | 31 |
| 7 | T S A Drilling Inc. Dba Penecore Drilling | 9 | 9 | 577 |
| 8 | American Well Drilling And Pump Service | 6 | 7 | 439 |
| 9 | Gulf Shore Construction Services Inc. | 5 | 5 | 28 |
| 10 | Jensen Kelin Drilling | 3 | 3 | 94 |
| 11 | Kleinfelder Inc. | 3 | 3 | 54 |
| 12 | Woodward Drilling Company Inc. | 2 | 49 | 1,542 |
| 13 | Peters Drilling And Pump Service | 2 | 4 | 11,563 |
| 14 | Cascade Drilling L P | 2 | 3 | 2,827 |
| 15 | Briski Well Drilling Co. | 1 | 159 | 2,747 |
| 16 | Hunt Drilling Company Inc. | 1 | 100 | 1,213 |
| 17 | Points West Drilling | 1 | 3 | 78 |
| 18 | Gregg Drilling LLC | 1 | 1 | 558 |
| 19 | American Construction And Supply Inc. | 1 | 1 | 1,685 |
| 20 | Well Industries Inc. | 1 | 1 | 558 |
| 21 | Dicken's Drilling | 1 | 1 | 490 |
| 22 | Castle Construction & Well Drilling Inc. | 1 | 1 | 142 |
| 23 | Robert Dawson Drilling & Pumps | — | 1,357 | 1,415 |
| 24 | Arrow Well Drilling | — | 1,199 | 1,202 |
| 25 | Peter Garicia | — | 651 | 695 |
| 26 | Water-Tech Well Drilling | — | 599 | 665 |
| 27 | Bfr Associates | — | 507 | 5,621 |
| 28 | Pambeau Pump & Well | — | 402 | 405 |
| 29 | Bill Rambeau Pump & Well Drilling | — | 262 | 288 |
| 30 | Kearns-Rivard Well Drilling | — | 241 | 291 |
| 31 | American River Well Drilling | — | 177 | 180 |
| 32 | White, Walter N. | — | 175 | 175 |
| 33 | Blain & Imbach Well Drilling | — | 158 | 168 |
| 34 | Kile's Well Drilling | — | 150 | 943 |
| 35 | Weston E Dawson | — | 126 | 147 |
| 36 | Tanko Gary C Well Drilling | — | 106 | 284 |
| 37 | Preston Well Drilling | — | 90 | 698 |
| 38 | Melvin L Lukins | — | 90 | 93 |
| 39 | Redhawk Drilling | — | 79 | 1,197 |
| 40 | James W Imbach Well Drilling | — | 76 | 86 |
| 41 | Signal Drilling Company | — | 55 | 8,301 |
| 42 | Wayne Drilling Co. | — | 53 | 1,113 |
| 43 | Lang Pump & Well Company | — | 52 | 60 |
| 44 | Tom Hunt Drilling Co. | — | 49 | 418 |
| 45 | W E Blain | — | 43 | 82 |
| 46 | Dunn Jack Inc. | — | 39 | 1,424 |
| 47 | Mel Meyer | — | 31 | 101,127 |
| 48 | Trihydro Corporation | — | 30 | 46 |
| 49 | Bertram Drilling Inc. | — | 23 | 1,171 |
| 50 | C & M Drilling Co. | — | 23 | 41 |
| 51 | J Field Drilling Co. | — | 22 | 275 |
| 52 | All Well Abandonment | — | 21 | 607 |
| 53 | R Wilder Gen Cont | — | 20 | 409 |
| 54 | Wayne Environmental Drilling Company Inc. | — | 17 | 664 |
| 55 | Humboldt Drilling & Pump Co. | — | 16 | 131 |
| 56 | Waters Backhoe & Dozer Service | — | 14 | 110 |
| 57 | W D C Exploration & Wells | — | 14 | 2,421 |
| 58 | Tanko Bros Inc. | — | 13 | 2,617 |
| 59 | Cascade Drilling Inc. - California | — | 12 | 3,167 |
| 60 | Resonantsonic International Inc. | — | 12 | 397 |
| 61 | Baker Scott | — | 12 | 33 |
| 62 | Tanko Well Drilling | — | 11 | 3,311 |
| 63 | Harris A J Inc. A California Corporation | — | 11 | 416 |
| 64 | West Hazmat Drilling Corp | — | 10 | 1,702 |
| 65 | Allmon C T Development Co. | — | 10 | 153 |
| 66 | Richardson Ernest Walker | — | 10 | 129 |
| 67 | Aaa Pump | — | 10 | 28 |
| 68 | Fredrick Mark Pump & Supply Co. | — | 9 | 295 |
| 69 | Boart Longyear Company | — | 9 | 172 |
| 70 | Gregg Drilling & Testing Inc. | — | 9 | 4,828 |
| 71 | Starr Drilling And Pump Co. | — | 9 | 875 |
| 72 | A B C Liovin Drilling Inc. | — | 8 | 1,281 |
| 73 | Bc2 Environmental LLC | — | 7 | 416 |
| 74 | Harris A J Co. | — | 7 | 239 |
| 75 | Joseph F. Leisek | — | 7 | 126 |
| 76 | Enprobe Environental Direct Push & Drilling Services | — | 7 | 76 |
| 77 | Huckfeldt Well Drilling Inc. | — | 6 | 1,881 |
| 78 | Seebeck M E | — | 6 | 567 |
| 79 | Points West Inc. | — | 6 | 165 |
| 80 | Patten Well Drilling | — | 5 | 421 |
| 81 | Cornerstone Pump & Well Inc. | — | 5 | 90 |
| 82 | Keener Exploration Drilling Co. | — | 5 | 37 |
| 83 | Confluence Environmental Inc. | — | 4 | 65 |
| 84 | Roadrunner Drilling & Pump Company Inc. | — | 4 | 205 |
| 85 | Beylik Drilling & Pump Service | — | 4 | 1,267 |
| 86 | Tahoe Pump & Drilling Inc. | — | 4 | 358 |
| 87 | Paul Williams And Sons | — | 4 | 175 |
| 88 | Geo W Taylor Well Drlg Service | — | 4 | 58 |
| 89 | Westex | — | 4 | 40 |
| 90 | S D Drilling Inc. | — | 4 | 31 |
| 91 | Cascade Drilling LP | — | 3 | 826 |
| 92 | Zim Industries Inc. Dba Bakersfield Well & Pump Co. | — | 3 | 1,716 |
| 93 | Sargent Drilling | — | 3 | 442 |
| 94 | American Well Drilling | — | 3 | 307 |
| 95 | Island Drilling | — | 3 | 221 |
| 96 | Well Drilling | — | 3 | 100 |
| 97 | Alva E Morgan | — | 3 | 45 |
| 98 | Cofferdam Unwatering Corporation | — | 3 | 32 |
| 99 | Taber Consultants | — | 3 | 30 |
| 100 | Canepa And Sons Inc. | — | 2 | 3,173 |
| 101 | Wilder, R., Drilling Company | — | 2 | 1,089 |
| 102 | Baldwin & Son Well Drilling | — | 2 | 901 |
| 103 | ED Fields Water Well Drilling | — | 2 | 234 |
| 104 | D W Moore Well Drilling | — | 2 | 170 |
| 105 | Steve's Pumps & Well Drilling Inc. | — | 2 | 162 |
| 106 | Hunt Tom Drilling & Construction Co. | — | 2 | 112 |
| 107 | General Development | — | 2 | 65 |
| 108 | Aqua Drilling & Well Service Inc. | — | 2 | 37 |
| 109 | Johnson Drilling Co. | — | 1 | 11,865 |
| 110 | Eaton Drilling Co. LLC | — | 1 | 3,793 |
| 111 | Baldwin & Son Well Drillers | — | 1 | 319 |
| 112 | D Hedman & Co. | — | 1 | 1,305 |
| 113 | Diversified Exploration Co. Inc. | — | 1 | 751 |
| 114 | Testamerica Drilling Corp | — | 1 | 378 |
| 115 | V & W Drilling | — | 1 | 310 |
| 116 | Water Well Drilling Cont | — | 1 | 263 |
| 117 | Beylik Drilling Inc. | — | 1 | 174 |
| 118 | Ralph E Anderson | — | 1 | 171 |
| 119 | Scott Xxx PC Exploration Inc. | — | 1 | 154 |
| 120 | M R Peck & Sons | — | 1 | 125 |
| 121 | Orsolini Well Drilling | — | 1 | 112 |
| 122 | Modoc Drilling | — | 1 | 90 |
| 123 | Stang Hydronics Inc. | — | 1 | 56 |
| 124 | Jack J Dunn | — | 1 | 54 |
| 125 | Environmental West Drilling | — | 1 | 38 |