| 1 | Hier Drilling Co. Inc. | 528 | 6,105 | 9,471 |
| 2 | Hamacher Well Works Inc. | 99 | 849 | 5,770 |
| 3 | Kunau Drilling LLC | 98 | 196 | 2,275 |
| 4 | Winegar Well Service | 55 | 63 | 126 |
| 5 | Can-America Drilling, Inc. | 51 | 253 | 2,631 |
| 6 | Parker Drilling/Pump Service Inc. | 50 | 852 | 2,520 |
| 7 | Dallas D. Werner | 41 | 54 | 317 |
| 8 | Trinity Water Solutions, LLC | 35 | 37 | 58 |
| 9 | Alpine Remediation, Inc. | 31 | 31 | 79 |
| 10 | Hydro Resources | 27 | 73 | 200 |
| 11 | Kelley Dewatering And Construction Company | 19 | 21 | 508 |
| 12 | Crandall Drilling & Pump Service | 11 | 21 | 3,573 |
| 13 | Authentic Drilling | 11 | 12 | 175 |
| 14 | Black Mountain Drilling | 9 | 13 | 533 |
| 15 | Layne, Christensen Co. | 7 | 129 | 1,492 |
| 16 | Ground Exploration LLC | 6 | 62 | 1,245 |
| 17 | James Drilling Company | 5 | 61 | 5,486 |
| 18 | Black Mountain Enterprises LLC | 3 | 43 | 1,461 |
| 19 | Holland/Mcmullen Water Well Drilling | 3 | 5 | 413 |
| 20 | Living Water Systems Inc. | 2 | 26 | 3,521 |
| 21 | Reaksecker Well Drilling | 1 | 779 | 1,369 |
| 22 | Grosch Irrigation Co. Inc. | 1 | 4 | 204 |
| 23 | Holland And Sons Water Well Drilling | 1 | 1 | 259 |
| 24 | Worosello Drilling Inc. | — | 551 | 937 |
| 25 | Fletcher Drilling | — | 254 | 1,471 |
| 26 | James E Leatherman | — | 163 | 266 |
| 27 | Eugene Wheeler | — | 161 | 333 |
| 28 | Henkle Drillng & Supply Co.inc | — | 133 | 231 |
| 29 | Fred Pearson Water Pump Svc. | — | 131 | 294 |
| 30 | Don W. Thompson Drillng & Pump | — | 95 | 191 |
| 31 | Roger Schocke Well Drlg. Inc. | — | 86 | 1,224 |
| 32 | Woods Drilling Inc. | — | 83 | 1,849 |
| 33 | Virginia Drilling Co. Inc. | — | 77 | 1,490 |
| 34 | Layne Western Company Inc. | — | 77 | 541 |
| 35 | Paul Fletcher & Sons Inc. | — | 64 | 316 |
| 36 | Ormsbee Development Co. | — | 62 | 117 |
| 37 | Paul Fletcher Drilling Co. | — | 51 | 76 |
| 38 | Hasz Energy & Development Co. | — | 38 | 298 |
| 39 | Clibon Drilling Co. | — | 36 | 75 |
| 40 | Atlas Drilling Company | — | 28 | 32 |
| 41 | Inter Mountain Drilling Ltd. | — | 25 | 1,204 |
| 42 | Townley Drilling | — | 25 | 258 |
| 43 | Aspen Drilling Company Inc. | — | 23 | 2,575 |
| 44 | Crandall Drlg. & Trenching Inc. | — | 22 | 304 |
| 45 | Colorado Water Well Pump Service & Supply Inc. | — | 22 | 39 |
| 46 | James Storm | — | 19 | 1,083 |
| 47 | Boyles Bros. Drilling Co. | — | 18 | 1,029 |
| 48 | John's Drilling Inc. | — | 17 | 1,452 |
| 49 | Walton, | — | 16 | 2,144 |
| 50 | Don Eastwood Drilling Inc. | — | 16 | 1,525 |
| 51 | Bomareto Pump And Equipment Company LLC | — | 16 | 223 |
| 52 | Howard C Bainbridge | — | 16 | 61 |
| 53 | United States Geological Survey | — | 16 | 48 |
| 54 | J. A. Price & Co. | — | 15 | 25 |
| 55 | Vine Laboratories, Inc. | — | 14 | 72 |
| 56 | Western Well Drilling Inc. | — | 14 | 99 |
| 57 | Arrow Drilling Co. | — | 13 | 1,009 |
| 58 | Bernard Storm | — | 13 | 461 |
| 59 | Wesley Runyon Drilling Co. | — | 13 | 375 |
| 60 | V. J. Stewart Drilling Co. | — | 13 | 348 |
| 61 | O.k. Hamacher Well Works | — | 13 | 180 |
| 62 | M & B Drilling Co. | — | 12 | 161 |
| 63 | Oliver Well Works | — | 11 | 453 |
| 64 | W. V. Harding & Sons | — | 11 | 257 |
| 65 | Hackworth Drilling Inc. | — | 11 | 174 |
| 66 | Peavler Drilling | — | 11 | 38 |
| 67 | Aragon Drilling Co. | — | 10 | 199 |
| 68 | Goodson & Associates | — | 10 | 73 |
| 69 | Clibon Well Drilling Co. | — | 10 | 34 |
| 70 | Western Well & Pump Inc. | — | 9 | 78 |
| 71 | Quality Well & Pump LLC | — | 8 | 700 |
| 72 | Schocke Drilling | — | 7 | 233 |
| 73 | Timberline Drilling | — | 7 | 177 |
| 74 | Bert D Downey | — | 7 | 71 |
| 75 | Denver Pump Company | — | 7 | 61 |
| 76 | Marc Haes | — | 7 | 42 |
| 77 | Crandall Bros. | — | 7 | 36 |
| 78 | Rmpd, Ltd Dba Rocky Mtn Pump & Drilling | — | 6 | 700 |
| 79 | Joe Coniff Elec. Co. | — | 6 | 87 |
| 80 | Ernie's Mountain Drilling Inc. | — | 5 | 3,106 |
| 81 | Bernard Drilling Co. | — | 5 | 678 |
| 82 | Drilling Engineers Inc. | — | 5 | 505 |
| 83 | Rupp Drilling Co., Inc. | — | 5 | 225 |
| 84 | Terracon Consultants Inc. | — | 4 | 324 |
| 85 | Holden & Holden | — | 4 | 986 |
| 86 | Dreiling Drilling Co. Inc. | — | 3 | 1,035 |
| 87 | Schmitt Drilling Co. | — | 3 | 609 |
| 88 | Crandall's Look-N-Good Drilling | — | 3 | 287 |
| 89 | Crabtree Well & Pump | — | 2 | 320 |
| 90 | Olin J Thompson | — | 2 | 176 |
| 91 | Ivan Spath | — | 2 | 102 |
| 92 | Boone Service | — | 2 | 97 |
| 93 | Domestic Water Consultants Inc. | — | 2 | 94 |
| 94 | Downey & Jaramio Well Drlg. | — | 2 | 88 |
| 95 | Allen Drilling & Excavating Co., Inc. | — | 1 | 3,520 |
| 96 | Schaal Drilling Co. | — | 1 | 1,922 |
| 97 | C. R. Smith Drilling | — | 1 | 2,011 |
| 98 | Eastwood Drilling LLC | — | 1 | 811 |
| 99 | Shelton Drilling Corporation | — | 1 | 42 |
| 100 | Ground Water Systems Inc. | — | 1 | 3,478 |
| 101 | Lesh Drilling Inc. | — | 1 | 2,445 |
| 102 | Leslie George Canfield | — | 1 | 2,164 |
| 103 | Norris & Sons | — | 1 | 1,572 |
| 104 | R & R Well & Pump Inc. | — | 1 | 629 |
| 105 | K. L. Rutt Company | — | 1 | 519 |
| 106 | Living Water Well & Pump Inc. | — | 1 | 411 |
| 107 | Rocky Mountain Pump & Drilling | — | 1 | 336 |
| 108 | Robert A. Jackson | — | 1 | 281 |
| 109 | C R Koogle | — | 1 | 257 |
| 110 | Adams City Mfg. Co. | — | 1 | 253 |
| 111 | Air West Drilling | — | 1 | 229 |
| 112 | Meredith Drilling Co. | — | 1 | 160 |
| 113 | Rudolph Pump & Equipment Co. | — | 1 | 115 |
| 114 | William D Glenn | — | 1 | 110 |
| 115 | Alpine Drilling & Pump Co. | — | 1 | 72 |
| 116 | Glen Cole | — | 1 | 67 |
| 117 | Milburn W Schoene | — | 1 | 61 |
| 118 | Rumberg Inc. | — | 1 | 53 |
| 119 | Dean's Well Service | — | 1 | 46 |
| 120 | Joe Felton & Son Drilling | — | 1 | 38 |
| 121 | Schmitt & Francis Drilling | — | 1 | 37 |
| 122 | Golden Drilling Inc. | — | 1 | 35 |
| 123 | Gary M. Vallas | — | 1 | 32 |