| 1 | Keen Well And Pump | 156 | 364 | 10,231 |
| 2 | Mount Water Well Drilling | 137 | 241 | 3,547 |
| 3 | Hurley's Water Well Drilling | 81 | 142 | 802 |
| 4 | Ramsey Drilling | 54 | 476 | 614 |
| 5 | Yoder Drilling & Geothermal | 23 | 23 | 1,353 |
| 6 | K & B Well Drilling Co. | 16 | 31 | 1,837 |
| 7 | Gard's Water Well Drilling | 14 | 103 | 160 |
| 8 | Jamison Well Drilling Inc. | 9 | 10 | 11,219 |
| 9 | Warthman Drilling Inc. | 5 | 15 | 4,411 |
| 10 | Bapst Inc. | 5 | 14 | 5,348 |
| 11 | J Miller & Sons Drilling | 5 | 6 | 1,124 |
| 12 | Steve Nethers Drilling | 3 | 11 | 151 |
| 13 | A & H Bevard Water Well Service | 3 | 4 | 44 |
| 14 | Central Soft Water | 3 | 3 | 1,489 |
| 15 | Jackson Well Services Inc. | 3 | 3 | 93 |
| 16 | B Mowrey Drilling LLC | 3 | 3 | 89 |
| 17 | Smith's Well Drilling LLC | 2 | 10 | 1,966 |
| 18 | J R Wells Water Well Drilling | 1 | 153 | 520 |
| 19 | American Drilling & Pump Service | 1 | 3 | 357 |
| 20 | Nethers Tom Drilling Co. | 1 | 2 | 108 |
| 21 | National Water Services (Lanc) | 1 | 1 | 91 |
| 22 | Sarbaugh Drilling | — | 372 | 475 |
| 23 | Filkill Water Well Drilling | — | 231 | 318 |
| 24 | Jordan (Emmett M) | — | 192 | 204 |
| 25 | Bohn Bros Well Drilling | — | 185 | 221 |
| 26 | Swingle (Donald) Well Drilling | — | 178 | 364 |
| 27 | Suburban Drilling Co. | — | 171 | 246 |
| 28 | Mike's Water Well Drilling | — | 98 | 175 |
| 29 | Marsh II Drilling | — | 93 | 133 |
| 30 | Speedy Drilling Co. | — | 75 | 2,142 |
| 31 | Lupher Drilling | — | 61 | 295 |
| 32 | L & M Drilling | — | 58 | 240 |
| 33 | Anderson Water Well Drilling | — | 55 | 92 |
| 34 | Wheeler (Ray) | — | 51 | 254 |
| 35 | Dutro (M L) | — | 41 | 43 |
| 36 | Cameron (Berlin A) | — | 36 | 47 |
| 37 | B E Wright Drilling | — | 32 | 260 |
| 38 | Hunter Drilling Co. | — | 32 | 75 |
| 39 | James R Moran Drilling Co. | — | 27 | 82 |
| 40 | Glen T Speedy Drilling | — | 26 | 32 |
| 41 | Snider Drilling Co. | — | 26 | 31 |
| 42 | Alexander Well Drilling | — | 24 | 25 |
| 43 | Wilson (Jim) Well Drilling | — | 21 | 1,464 |
| 44 | Wheeler Drilling Co. | — | 21 | 122 |
| 45 | Northcoast Drilling Service Inc. | — | 19 | 32 |
| 46 | Wilson Plbg Htg & Cooling | — | 17 | 145 |
| 47 | Melick (W O) | — | 17 | 124 |
| 48 | Gone Deep Water Well (Bengi) | — | 16 | 26 |
| 49 | Beinhower Bros Drilling Co. | — | 14 | 3,766 |
| 50 | Mcgee Drilling | — | 13 | 56 |
| 51 | Harper (W H) | — | 13 | 27 |
| 52 | Mckee Well Drilling | — | 13 | 25 |
| 53 | Danny's Water Well Drilling | — | 12 | 379 |
| 54 | Flinner Drilling Inc. | — | 10 | 8,459 |
| 55 | Quinter Well Drilling LLC | — | 9 | 12,078 |
| 56 | Moran (John T) | — | 9 | 53 |
| 57 | Varner (Lloyd) | — | 9 | 33 |
| 58 | Sheets Machinery | — | 8 | 381 |
| 59 | Benjamin (C B) | — | 8 | 213 |
| 60 | Markle Drilling | — | 8 | 199 |
| 61 | Hoover Water Systems | — | 8 | 143 |
| 62 | Mullet Drilling Company Inc. | — | 7 | 2,605 |
| 63 | Gehrke Drilling & Supply Co. | — | 7 | 242 |
| 64 | Wilson (Vance) Well Drilling | — | 6 | 181 |
| 65 | N L Croup Drilling | — | 6 | 163 |
| 66 | Randles (Denver) | — | 6 | 71 |
| 67 | Marlatt Well Drilling | — | 6 | 51 |
| 68 | Sprowls Drilling Co. | — | 5 | 1,348 |
| 69 | Frost Drilling | — | 5 | 386 |
| 70 | B & B Well Drilling | — | 5 | 134 |
| 71 | Myers (Russell E) | — | 5 | 37 |
| 72 | Had Inc. | — | 4 | 783 |
| 73 | Cunningham Well Drilling | — | 4 | 755 |
| 74 | Professional Water Well Systems | — | 4 | 624 |
| 75 | Leyden Management | — | 4 | 525 |
| 76 | S & N Berea Drilling Co. | — | 4 | 331 |
| 77 | G M Baker & Son | — | 4 | 259 |
| 78 | G & J Drilling | — | 4 | 254 |
| 79 | Central Ohio Drilling | — | 4 | 169 |
| 80 | H & D Drilling Company | — | 4 | 118 |
| 81 | Doug Frost Drilling | — | 4 | 118 |
| 82 | H & A Water Well Drlg & Pump Svc | — | 4 | 106 |
| 83 | Mcfarland Drilling Co. | — | 4 | 71 |
| 84 | Denman Water Well Drilling | — | 4 | 49 |
| 85 | T C Excavating | — | 3 | 198 |
| 86 | Ohio Drilling Company | — | 3 | 409 |
| 87 | Ruby (Stan) Well Drilling | — | 3 | 750 |
| 88 | Alliance Water Well Inc. | — | 3 | 458 |
| 89 | Mccoy Well Drilling Service | — | 3 | 253 |
| 90 | Larry Bevard Water Well Drilling | — | 3 | 187 |
| 91 | K & S Well Drilling | — | 3 | 161 |
| 92 | Mcnichols & Son Drilling | — | 3 | 38 |
| 93 | Adams Drilling | — | 3 | 30 |
| 94 | J R Riley Drilling | — | 3 | 27 |
| 95 | Triple J Drilling (Newark) | — | 3 | 27 |
| 96 | Depew Well Drilling | — | 2 | 2,080 |
| 97 | Dean's Drilling | — | 2 | 1,010 |
| 98 | Mason Well Drilling | — | 2 | 908 |
| 99 | Blair Drilling & Pump Serv LLC | — | 2 | 593 |
| 100 | Bell Well Drilling Inc. | — | 2 | 2,095 |
| 101 | Jenei Drilling Co. Inc. | — | 2 | 1,390 |
| 102 | Leindecker Well Drilling | — | 2 | 796 |
| 103 | Meyer Well Drilling | — | 2 | 758 |
| 104 | Agua Well Drilling Inc. | — | 2 | 449 |
| 105 | Peck (Carl) Well Drilling | — | 2 | 412 |
| 106 | Layne Ohio (Layne Christensen) | — | 2 | 346 |
| 107 | Parks Well Drilling | — | 2 | 283 |
| 108 | Hall's Water Well Drilling | — | 2 | 234 |
| 109 | Odnr (Water) | — | 2 | 185 |
| 110 | Price (Dwight E) | — | 2 | 161 |
| 111 | Halls Well Drilling | — | 2 | 149 |
| 112 | Ace Drilling | — | 2 | 88 |
| 113 | Scott A Welch Water Well Drilling | — | 2 | 85 |
| 114 | M & M Contractors | — | 2 | 79 |
| 115 | Bevard (Larry) Well Drilling | — | 2 | 43 |
| 116 | Bevard (Carl) Well Drilling | — | 2 | 40 |
| 117 | R & C Drilling Co. | — | 2 | 34 |
| 118 | Ranger Drilling | — | 2 | 31 |
| 119 | Hoffman's Water Well Service | — | 2 | 30 |
| 120 | Seismic Drilling Co. Inc. | — | 1 | 5,783 |
| 121 | Moody's OF Dayton Inc. | — | 1 | 361 |
| 122 | Civiello Drilling | — | 1 | 1,139 |
| 123 | A & G Well Drilling Inc. | — | 1 | 1,010 |
| 124 | Kimball Well Drilling | — | 1 | 2,594 |
| 125 | Jackson & Sons Drilling & Pump Co. | — | 1 | 3,154 |
| 126 | R C Barry Company | — | 1 | 3,818 |
| 127 | Saltzgaber Drilling Co. | — | 1 | 2,527 |
| 128 | Scott Well & Pump Co. | — | 1 | 604 |
| 129 | J & O Drilling | — | 1 | 399 |
| 130 | Flick's Drilling Inc. | — | 1 | 355 |
| 131 | Wright (Larry) Drilling | — | 1 | 293 |
| 132 | Harley (V J) And Son | — | 1 | 236 |
| 133 | Applegate (Glenn C) | — | 1 | 235 |
| 134 | Anders Drilling | — | 1 | 219 |
| 135 | Bowen Excavating And Drilling | — | 1 | 204 |
| 136 | Price Drilling | — | 1 | 184 |
| 137 | Mike Herr Well & Pump | — | 1 | 179 |
| 138 | Goodwin (R H) | — | 1 | 164 |
| 139 | Morgan Well Drilling | — | 1 | 147 |
| 140 | Helser & Sons Water Well Drilling | — | 1 | 121 |
| 141 | Parsons (Lovell M) | — | 1 | 118 |
| 142 | Applegate (G D) | — | 1 | 88 |
| 143 | Sprowls Drilling Co. (Groveport) | — | 1 | 84 |
| 144 | Jobes & Jobes Drilling | — | 1 | 64 |
| 145 | Belasco Drilling Inc. | — | 1 | 47 |
| 146 | Shoemaker Drilling Inc. | — | 1 | 46 |
| 147 | Stoffer Drilling | — | 1 | 34 |