| 1 | Jones Well Drilling Co. Inc. | 666 | 1,816 | 2,721 |
| 2 | Nugent Drilling Co. | 595 | 2,230 | 2,552 |
| 3 | Steve Kaser | 110 | 110 | 1,241 |
| 4 | Mack Drilling Co. | 93 | 310 | 2,791 |
| 5 | Corvallis Drilling Co. Inc. | 79 | 244 | 2,745 |
| 6 | West Coast Well Drilling LLC | 56 | 56 | 333 |
| 7 | Glacier Drilling & Dewatering | 28 | 28 | 1,449 |
| 8 | Casey Jones Well Drilling | 25 | 150 | 5,361 |
| 9 | Ron Robinson Well Drilling | 25 | 65 | 646 |
| 10 | Hendrickson Well Drilling Inc. | 24 | 57 | 1,945 |
| 11 | Mid Valley Drilling, Inc. | 21 | 170 | 1,925 |
| 12 | Sippel Well Drilling Inc. | 15 | 73 | 2,102 |
| 13 | Lee Drilling | 15 | 15 | 268 |
| 14 | All Seasons Well Drilling | 14 | 45 | 525 |
| 15 | M & M Well Drilling | 12 | 33 | 297 |
| 16 | Bill Fielder Well Drilling & Pump | 11 | 41 | 933 |
| 17 | Westerberg Drilling | 9 | 36 | 1,937 |
| 18 | Robert D Miller Consulting | 6 | 6 | 92 |
| 19 | Bill Fielder Well Drilling | 4 | 4 | 80 |
| 20 | Dickerson Well Drilling | 3 | 13 | 1,647 |
| 21 | Stettler Supply Co. | 2 | 9 | 168 |
| 22 | White Water Well Drilling | 2 | 5 | 888 |
| 23 | West Coast Drilling | 2 | 5 | 474 |
| 24 | K Consulting | 2 | 2 | 88 |
| 25 | Prepared BY Owrd Staff | 1 | 22 | 1,283 |
| 26 | Land Owner | 1 | 20 | 1,454 |
| 27 | Aiken Well Drilling | 1 | 1 | 3,691 |
| 28 | Skyles Drilling Inc. | 1 | 1 | 5,397 |
| 29 | Schneider Water Services | 1 | 1 | 164 |
| 30 | Jones Drilling Co. Inc. | — | 443 | 678 |
| 31 | Merle Warren Well Drilling | — | 385 | 484 |
| 32 | Ridders Well Drilling | — | 276 | 380 |
| 33 | Gray Well Drilling Inc. | — | 182 | 795 |
| 34 | Well ID Application | — | 158 | 2,794 |
| 35 | Schoen Electric & Pump | — | 128 | 405 |
| 36 | H & H Drilling | — | 100 | 131 |
| 37 | Joneses Drilling Co. Inc. | — | 89 | 177 |
| 38 | Malcolm Drilling Co. Inc. | — | 76 | 945 |
| 39 | Christensen Well Drilling Co. | — | 66 | 1,129 |
| 40 | Bobs Well Drilling Inc. | — | 58 | 95 |
| 41 | Arms & Schilling | — | 38 | 43 |
| 42 | Pete Tolmasoff Well Drilling | — | 37 | 919 |
| 43 | Abco Drilling Co. | — | 37 | 37 |
| 44 | Scheler Well Drilling | — | 36 | 47 |
| 45 | Howard Arms | — | 35 | 35 |
| 46 | Bob Scheler Well Drilling | — | 31 | 91 |
| 47 | Willamette Drilling Co. | — | 29 | 3,018 |
| 48 | Hansen Drilling Co. Inc. | — | 29 | 378 |
| 49 | Arms & Schilling Well Drilling | — | 29 | 46 |
| 50 | N Klaus Drilling Co. | — | 29 | 38 |
| 51 | William R Long | — | 27 | 32 |
| 52 | Todd's Drilling Service | — | 26 | 319 |
| 53 | Harry A Robinson Well Drilling | — | 25 | 84 |
| 54 | Miller & West Well Drilling | — | 24 | 47 |
| 55 | Pyle & Salisbury | — | 24 | 38 |
| 56 | Ace Drilling Co. | — | 23 | 42 |
| 57 | Zander Drilling Co. | — | 20 | 153 |
| 58 | Frank Wagy Well Drilling | — | 20 | 34 |
| 59 | Long Drilling | — | 18 | 269 |
| 60 | Buds Well Drilling | — | 18 | 66 |
| 61 | Scheler Drilling | — | 17 | 27 |
| 62 | Studebaker Brothers | — | 15 | 340 |
| 63 | Schoen Electric Inc. | — | 15 | 88 |
| 64 | Valley Well Drillers | — | 15 | 26 |
| 65 | Melvin Search Well Drilling | — | 14 | 40 |
| 66 | Owrd Staff | — | 13 | 597 |
| 67 | R Stadeli & Sons Inc. | — | 13 | 1,766 |
| 68 | M & H Well Drilling | — | 13 | 472 |
| 69 | Schneider Equipment Co. | — | 13 | 470 |
| 70 | Ground Water Systems Inc. | — | 12 | 753 |
| 71 | L W Mutschler Well Drilling | — | 12 | 191 |
| 72 | Northwest Well Drilling | — | 11 | 78 |
| 73 | Staco Well Services | — | 10 | 324 |
| 74 | Water Boys Well Drilling | — | 10 | 46 |
| 75 | Richardson Well Drilling | — | 9 | 43 |
| 76 | Bill Fields Well Drilling & Pump | — | 8 | 147 |
| 77 | Monders Drilling Inc. | — | 7 | 491 |
| 78 | Geo-Tech Explorations | — | 6 | 384 |
| 79 | Mike Waldroop Well Drilling | — | 6 | 101 |
| 80 | G A Pruitt Well Drilling | — | 6 | 33 |
| 81 | Search Drilling Inc. | — | 5 | 789 |
| 82 | Miller & West | — | 5 | 486 |
| 83 | Beier & Waldroop Well Services Inc. | — | 5 | 231 |
| 84 | Capitol Well Drilling Inc. | — | 5 | 50 |
| 85 | Schoens Electric & Pump | — | 5 | 34 |
| 86 | Pitcher Pump And Drilling | — | 4 | 248 |
| 87 | Gellatly & Witham | — | 4 | 81 |
| 88 | American Well Drilling Inc. | — | 3 | 532 |
| 89 | Eola Well Drilling | — | 3 | 341 |
| 90 | M-H Well Drilling Inc. | — | 3 | 129 |
| 91 | Lee Well Drilling & Pump Servi | — | 3 | 80 |
| 92 | Walter N White | — | 3 | 50 |
| 93 | Paul & Florence Stadeli Inc. | — | 3 | 36 |
| 94 | Earth & Water Works | — | 2 | 1,023 |
| 95 | Western Drilling Co. | — | 2 | 997 |
| 96 | Cascade Drilling LP | — | 2 | 325 |
| 97 | A M Jannsen Well Drilling Co. Inc. | — | 2 | 1,744 |
| 98 | J W Beck Well Drilling | — | 2 | 259 |
| 99 | Carters Drilling & Pump Service Inc. | — | 2 | 182 |
| 100 | Robinson Well Drilling | — | 2 | 170 |
| 101 | Western Well Drilling | — | 2 | 134 |
| 102 | Robinson Drilling Wells&pumps | — | 2 | 118 |
| 103 | Miller West Well Drilling | — | 2 | 116 |
| 104 | Stadeli Drilling Co. | — | 2 | 101 |
| 105 | Sneed Well Drilling Inc. | — | 2 | 82 |
| 106 | Environmental West Exploration | — | 2 | 56 |
| 107 | Henrickson Construction And WE | — | 2 | 56 |
| 108 | William Long Drilling | — | 2 | 53 |
| 109 | Lee Well Drilling & Pump Service | — | 2 | 30 |
| 110 | Floyd Sippel Well Drilling | — | 2 | 26 |
| 111 | R Stadeli & Sons Well & Pump Inc. | — | 1 | 161 |
| 112 | Western Water Development | — | 1 | 984 |
| 113 | Jensen Drilling Co. | — | 1 | 408 |
| 114 | J A Sneed & Sons | — | 1 | 1,087 |
| 115 | Becks Well Drilling | — | 1 | 774 |
| 116 | Troy Griffin Well Drilling | — | 1 | 562 |
| 117 | Miller-Robinson & West | — | 1 | 424 |
| 118 | R J Strasser Drilling Co. | — | 1 | 410 |
| 119 | Larry K Crawford | — | 1 | 396 |
| 120 | Robinson Eola Drilling | — | 1 | 346 |
| 121 | Miller & West Drilling | — | 1 | 283 |
| 122 | W W Drilling & Pump | — | 1 | 228 |
| 123 | Hayes & Page Well Drilling | — | 1 | 207 |
| 124 | Dell Page Well Drilling Inc. | — | 1 | 186 |
| 125 | Glen White Well Drilling | — | 1 | 150 |
| 126 | West Well Drilling | — | 1 | 135 |
| 127 | Frank Wilson Drilling | — | 1 | 116 |
| 128 | Art Clinton Well Drilling Co. | — | 1 | 109 |
| 129 | Stites Well Drilling | — | 1 | 89 |
| 130 | Mutschler Well Drilling | — | 1 | 81 |
| 131 | Clays Well Drilling | — | 1 | 67 |
| 132 | George Robinson Drilling | — | 1 | 64 |
| 133 | Eastwood Water Well Drilling | — | 1 | 53 |
| 134 | O C Tandy Well Drilling | — | 1 | 50 |
| 135 | Kulick Well Drilling | — | 1 | 42 |
| 136 | Howell Well Drilling | — | 1 | 40 |
| 137 | Deceased/R. J. Strasser Drilling Co. | — | 1 | 38 |
| 138 | Christensen Well Drilling Co./Deceased 12/2013 | — | 1 | 35 |
| 139 | Hoeck Well Drilling | — | 1 | 35 |
| 140 | Highland Drilling | — | 1 | 27 |