| 1 | Hier Drilling Co. Inc. | 528 | 6,108 | 9,664 |
| 2 | Hamacher Well Works Inc. | 99 | 849 | 10,447 |
| 3 | Kunau Drilling LLC | 98 | 196 | 7,197 |
| 4 | Winegar Well Service | 55 | 63 | 169 |
| 5 | Can-America Drilling, Inc. | 51 | 253 | 5,159 |
| 6 | Parker Drilling/Pump Service Inc. | 50 | 852 | 2,530 |
| 7 | Dallas D. Werner | 41 | 54 | 437 |
| 8 | Trinity Water Solutions, LLC | 35 | 37 | 61 |
| 9 | Alpine Remediation, Inc. | 31 | 31 | 84 |
| 10 | Hydro Resources | 27 | 73 | 307 |
| 11 | Kelley Dewatering And Construction Company | 19 | 21 | 538 |
| 12 | Crandall Drilling & Pump Service | 11 | 21 | 3,578 |
| 13 | Authentic Drilling | 11 | 12 | 281 |
| 14 | Black Mountain Drilling | 9 | 13 | 996 |
| 15 | Layne, Christensen Co. | 7 | 129 | 1,963 |
| 16 | Ground Exploration LLC | 6 | 62 | 1,454 |
| 17 | James Drilling Company | 5 | 61 | 6,736 |
| 18 | Layne A Granite Company | 5 | 5 | 35 |
| 19 | Black Mountain Enterprises LLC | 3 | 43 | 3,016 |
| 20 | Holland/Mcmullen Water Well Drilling | 3 | 5 | 427 |
| 21 | Living Water Systems Inc. | 2 | 26 | 3,572 |
| 22 | Aqua Tec Systems, Inc. | 2 | 2 | 25 |
| 23 | Reaksecker Well Drilling | 1 | 779 | 1,435 |
| 24 | Grosch Irrigation Co. Inc. | 1 | 4 | 210 |
| 25 | Valley Pump Company | 1 | 1 | 2,578 |
| 26 | Holland And Sons Water Well Drilling | 1 | 1 | 275 |
| 27 | Twin Peaks Drilling | 1 | 1 | 475 |
| 28 | Worosello Drilling Inc. | — | 553 | 945 |
| 29 | Fletcher Drilling | — | 254 | 3,523 |
| 30 | James E Leatherman | — | 163 | 278 |
| 31 | Eugene Wheeler | — | 162 | 334 |
| 32 | Henkle Drillng & Supply Co.inc | — | 133 | 384 |
| 33 | Fred Pearson Water Pump Svc. | — | 131 | 294 |
| 34 | Don W. Thompson Drillng & Pump | — | 95 | 191 |
| 35 | Roger Schocke Well Drlg. Inc. | — | 86 | 1,230 |
| 36 | Woods Drilling Inc. | — | 83 | 3,293 |
| 37 | Virginia Drilling Co. Inc. | — | 77 | 2,167 |
| 38 | Layne Western Company Inc. | — | 77 | 659 |
| 39 | Paul Fletcher & Sons Inc. | — | 65 | 965 |
| 40 | Ormsbee Development Co. | — | 62 | 120 |
| 41 | Paul Fletcher Drilling Co. | — | 51 | 179 |
| 42 | Hasz Energy & Development Co. | — | 38 | 329 |
| 43 | Clibon Drilling Co. | — | 36 | 77 |
| 44 | Atlas Drilling Company | — | 28 | 34 |
| 45 | Inter Mountain Drilling Ltd. | — | 25 | 1,946 |
| 46 | Townley Drilling | — | 25 | 755 |
| 47 | Aspen Drilling Company Inc. | — | 23 | 2,648 |
| 48 | Crandall Drlg. & Trenching Inc. | — | 22 | 325 |
| 49 | Colorado Water Well Pump Service & Supply Inc. | — | 22 | 113 |
| 50 | James Storm | — | 19 | 1,117 |
| 51 | Boyles Bros. Drilling Co. | — | 18 | 1,088 |
| 52 | John's Drilling Inc. | — | 17 | 1,460 |
| 53 | Walton, | — | 16 | 2,156 |
| 54 | Don Eastwood Drilling Inc. | — | 16 | 1,672 |
| 55 | Bomareto Pump And Equipment Company LLC | — | 16 | 234 |
| 56 | United States Geological Survey | — | 16 | 96 |
| 57 | Baski Drilling Inc. | — | 16 | 65 |
| 58 | Howard C Bainbridge | — | 16 | 64 |
| 59 | J. A. Price & Co. | — | 15 | 29 |
| 60 | Vine Laboratories, Inc. | — | 14 | 167 |
| 61 | Western Well Drilling Inc. | — | 14 | 113 |
| 62 | Arrow Drilling | — | 13 | 2,709 |
| 63 | V. J. Stewart Drilling Co. | — | 13 | 1,156 |
| 64 | Bernard Storm | — | 13 | 536 |
| 65 | O.k. Hamacher Well Works | — | 13 | 393 |
| 66 | Wesley Runyon Drilling Co. | — | 13 | 378 |
| 67 | M & B Drilling Co. | — | 12 | 2,291 |
| 68 | W. V. Harding & Sons | — | 11 | 1,161 |
| 69 | Oliver Well Works | — | 11 | 465 |
| 70 | Hackworth Drilling Inc. | — | 11 | 188 |
| 71 | Peavler Drilling | — | 11 | 38 |
| 72 | Aragon Drilling Co. | — | 10 | 205 |
| 73 | Goodson & Associates | — | 10 | 73 |
| 74 | Clibon Well Drilling Co. | — | 10 | 47 |
| 75 | Western Well & Pump Inc. | — | 9 | 85 |
| 76 | Quality Well & Pump LLC | — | 8 | 702 |
| 77 | Dak Drilling LLC | — | 7 | 1,696 |
| 78 | Timberline Drilling | — | 7 | 295 |
| 79 | Schocke Drilling | — | 7 | 233 |
| 80 | Marc Haes | — | 7 | 80 |
| 81 | Bert D Downey | — | 7 | 74 |
| 82 | Denver Pump Company | — | 7 | 62 |
| 83 | Crandall Bros. | — | 7 | 37 |
| 84 | Rmpd, Ltd Dba Rocky Mtn Pump & Drilling | — | 6 | 1,204 |
| 85 | Joe Coniff Elec. Co. | — | 6 | 179 |
| 86 | Nwp Drilling & Consulting | — | 5 | 634 |
| 87 | Ernie's Mountain Drilling Inc. | — | 5 | 3,118 |
| 88 | Bernard Drilling Co. | — | 5 | 696 |
| 89 | Drilling Engineers Inc. | — | 5 | 553 |
| 90 | Rupp Drilling Co., Inc. | — | 5 | 226 |
| 91 | Terracon Consultants Inc. | — | 4 | 391 |
| 92 | Holden & Holden | — | 4 | 1,000 |
| 93 | George Stewart | — | 4 | 488 |
| 94 | Norman Hill Drilling Co. | — | 4 | 39 |
| 95 | Dreiling Drilling Co. Inc. | — | 3 | 1,083 |
| 96 | Schmitt Drilling Co. | — | 3 | 621 |
| 97 | Crandall's Look-N-Good Drilling | — | 3 | 292 |
| 98 | E R Goodrich | — | 3 | 34 |
| 99 | American Drilling Service | — | 2 | 3,555 |
| 100 | Arkansas Valley Drilling | — | 2 | 3,041 |
| 101 | Mitchell Drilling Co. | — | 2 | 793 |
| 102 | H A Crandall | — | 2 | 436 |
| 103 | Crabtree Well & Pump | — | 2 | 377 |
| 104 | Gary Oberhansly | — | 2 | 257 |
| 105 | Olin J Thompson | — | 2 | 183 |
| 106 | Domestic Water Consultants Inc. | — | 2 | 129 |
| 107 | DA Smith Drilling Company | — | 2 | 108 |
| 108 | Rye Well Drilling Co. | — | 2 | 103 |
| 109 | Ivan Spath | — | 2 | 102 |
| 110 | Boone Service | — | 2 | 102 |
| 111 | Allison Drilling Co. Inc. | — | 2 | 99 |
| 112 | Downey & Jaramio Well Drlg. | — | 2 | 89 |
| 113 | Schmitt & Francis Drilling | — | 2 | 42 |
| 114 | Shelton Drilling Corporation | — | 1 | 6,161 |
| 115 | Allen Drilling & Excavating Co., Inc. | — | 1 | 3,788 |
| 116 | Schaal Drilling Co. | — | 1 | 2,203 |
| 117 | C. R. Smith Drilling | — | 1 | 2,039 |
| 118 | Mccoy Water Well/Precision Drilling | — | 1 | 88 |
| 119 | Eastwood Drilling | — | 1 | 1,739 |
| 120 | Valley Drilling Co. | — | 1 | 1,166 |
| 121 | Ground Water Systems Inc. | — | 1 | 3,481 |
| 122 | Lesh Drilling Inc. | — | 1 | 2,470 |
| 123 | Leslie George Canfield | — | 1 | 2,170 |
| 124 | Norris & Sons | — | 1 | 1,573 |
| 125 | Alpine Drilling & Pump Co. | — | 1 | 980 |
| 126 | R & R Well & Pump Inc. | — | 1 | 630 |
| 127 | K. L. Rutt Company | — | 1 | 520 |
| 128 | Rocky Mountain Pump & Drilling | — | 1 | 508 |
| 129 | Kunau Drilling & Excavation | — | 1 | 465 |
| 130 | D W Spencer | — | 1 | 417 |
| 131 | Living Water Well & Pump Inc. | — | 1 | 414 |
| 132 | Robert A. Jackson | — | 1 | 284 |
| 133 | C R Koogle | — | 1 | 257 |
| 134 | Adams City Mfg. Co. | — | 1 | 254 |
| 135 | Air West Drilling | — | 1 | 237 |
| 136 | Meredith Drilling Co. | — | 1 | 164 |
| 137 | Rudolph Pump & Equipment Co. | — | 1 | 116 |
| 138 | William D Glenn | — | 1 | 110 |
| 139 | Marco Exploration | — | 1 | 102 |
| 140 | Glen Cole | — | 1 | 84 |
| 141 | Milburn W Schoene | — | 1 | 62 |
| 142 | Rumberg Inc. | — | 1 | 54 |
| 143 | Dean's Well Service | — | 1 | 47 |
| 144 | Joe Felton & Son Drilling | — | 1 | 43 |
| 145 | Golden Drilling Inc. | — | 1 | 40 |
| 146 | Gary M. Vallas | — | 1 | 37 |
| 147 | Earl Crane | — | 1 | 31 |
| 148 | Johnson Well Drilling | — | 1 | 29 |
| 149 | Pikes Peak Drlg & Pump Corp. | — | 1 | 26 |
| 150 | Steele Drilling Company | — | 1 | 26 |
| 151 | H B Pixley | — | 1 | 25 |