| 1 | Flinner Drilling Inc. | 691 | 5,533 | 8,459 |
| 2 | Jamison Well Drilling Inc. | 387 | 840 | 11,219 |
| 3 | J Miller & Sons Drilling | 251 | 302 | 1,124 |
| 4 | Keen Well And Pump | 95 | 251 | 10,231 |
| 5 | Yoder Drilling & Geothermal | 73 | 73 | 1,353 |
| 6 | Central Soft Water | 43 | 45 | 1,489 |
| 7 | A W Smith Well Drilling | 34 | 96 | 1,041 |
| 8 | Harley Drilling & Pumps Ltd | 22 | 601 | 1,154 |
| 9 | Davidson Well Drilling | 21 | 22 | 3,177 |
| 10 | Domer Water Services LLC | 16 | 113 | 145 |
| 11 | Alexander W Smith Water Well Serv | 15 | 15 | 150 |
| 12 | Anderson Drilling & Pump Inc. | 11 | 26 | 2,933 |
| 13 | Landrum Drilling & Pump | 10 | 50 | 299 |
| 14 | Duncan Drilling Co. | 9 | 42 | 1,395 |
| 15 | Depew Well Drilling | 9 | 34 | 2,080 |
| 16 | Carroll's Well Drilling | 9 | 17 | 2,028 |
| 17 | R H Fowler Well Drilling LLC | 7 | 18 | 844 |
| 18 | Wayne Drilling | 5 | 31 | 40 |
| 19 | Aqua Ace Well Drilling | 4 | 6 | 93 |
| 20 | Had Inc. | 3 | 167 | 783 |
| 21 | Patriot Drilling | 3 | 19 | 470 |
| 22 | K & B Well Drilling Co. | 3 | 6 | 1,837 |
| 23 | Griffith Drilling Co. | 3 | 5 | 854 |
| 24 | Jackson Well Services Inc. | 3 | 3 | 93 |
| 25 | Hardman Drilling | 2 | 62 | 1,288 |
| 26 | Donamarc Water Systems Co. | 2 | 49 | 2,417 |
| 27 | Seismic Drilling Co. Inc. | 2 | 3 | 5,783 |
| 28 | Beinhower Bros Drilling Co. | 2 | 2 | 3,766 |
| 29 | Williams Drilling Co. | 2 | 2 | 65 |
| 30 | Crowner Drilling Inc. | 1 | 979 | 1,190 |
| 31 | Jackson & Sons Drilling & Pump Co. | 1 | 228 | 3,154 |
| 32 | Robert E Smith Drilling | 1 | 144 | 2,483 |
| 33 | Rex Drilling Co. | 1 | 38 | 478 |
| 34 | Pugh (L E) | 1 | 28 | 1,908 |
| 35 | Valley Well & Pump Service Inc. | 1 | 26 | 1,409 |
| 36 | Pugh Well Drilling | 1 | 26 | 2,961 |
| 37 | Williams (Nick) Drilling | 1 | 15 | 320 |
| 38 | Cooper Water Well Drilling | 1 | 12 | 2,153 |
| 39 | American Drilling & Pump Service | 1 | 7 | 357 |
| 40 | Bjaam Environmental Inc. | 1 | 2 | 156 |
| 41 | Dillan Well Drilling Inc. | 1 | 1 | 2,861 |
| 42 | Southwind Drilling Company | 1 | 1 | 4,282 |
| 43 | Robert E Burrows Well Drilling | 1 | 1 | 1,615 |
| 44 | Adams & Sons Pump Service Inc. | 1 | 1 | 169 |
| 45 | Johnson Hardware Co. | — | 1,003 | 1,334 |
| 46 | Hofacker (Roy) | — | 725 | 814 |
| 47 | Marion Kornhaus Well Drilling | — | 498 | 565 |
| 48 | R G Stockert Drilling Co. | — | 484 | 3,130 |
| 49 | Bieri (K E) | — | 367 | 576 |
| 50 | Mullet Drilling Company Inc. | — | 315 | 2,605 |
| 51 | Moravy Drilling Inc. | — | 277 | 875 |
| 52 | A-1 Water Service | — | 244 | 252 |
| 53 | West Salem Drilling Co. | — | 205 | 530 |
| 54 | Slanker Well Drilling | — | 192 | 794 |
| 55 | Frost Drilling | — | 129 | 386 |
| 56 | Hatfield (R A) & Son Inc. | — | 122 | 243 |
| 57 | Tracy (Hershel) | — | 87 | 197 |
| 58 | Reynolds (B A) | — | 85 | 88 |
| 59 | Smith (Gerald) Well Drilling | — | 75 | 456 |
| 60 | Roberts (Willard) Well Drilling | — | 62 | 635 |
| 61 | Hottel (Glenn D) | — | 60 | 71 |
| 62 | Kaser (V J) | — | 50 | 261 |
| 63 | FW Eikleberry & Son | — | 45 | 111 |
| 64 | Fowler Drilling Inc. | — | 44 | 2,496 |
| 65 | Quentin Neal Well Drilling | — | 43 | 491 |
| 66 | Turner (George L) | — | 41 | 184 |
| 67 | Ohio Drilling Company | — | 40 | 409 |
| 68 | Fearon & Feller Inc. | — | 36 | 1,028 |
| 69 | Stoltz Well Drilling | — | 34 | 685 |
| 70 | Shorts Water Well Drilling | — | 34 | 138 |
| 71 | D & L Drilling LLC (Old) | — | 34 | 88 |
| 72 | Bennett Drilling Co. | — | 32 | 1,074 |
| 73 | Jenei Drilling Co. Inc. | — | 31 | 1,390 |
| 74 | Shetler Well Drilling | — | 29 | 396 |
| 75 | Quinter Well Drilling LLC | — | 28 | 12,078 |
| 76 | Shorts (Russ) Well Drilling | — | 26 | 33 |
| 77 | Coventry Well & Pump Service | — | 24 | 519 |
| 78 | Marion Harvey & Co. | — | 24 | 376 |
| 79 | Lehman Well Drilling | — | 23 | 80 |
| 80 | Waltz Everett & Co. Inc. | — | 22 | 1,124 |
| 81 | Alchier Well Drilling | — | 22 | 849 |
| 82 | Saltzgaber Drilling Co. | — | 21 | 2,527 |
| 83 | Long (T D) Drilling Co. | — | 21 | 189 |
| 84 | Freed Water Well Drilling | — | 20 | 1,755 |
| 85 | Shetler Drilling | — | 20 | 32 |
| 86 | Ricketts & Co. | — | 18 | 83 |
| 87 | Donley (Walter) | — | 17 | 97 |
| 88 | Frantz Dawson Drilling Co. | — | 14 | 498 |
| 89 | Spencer (A C) | — | 14 | 386 |
| 90 | Garman Drilling | — | 14 | 155 |
| 91 | Kamph's Pump & Well Service | — | 14 | 119 |
| 92 | Rhoades (Paul) | — | 13 | 340 |
| 93 | Gene's Water Service Inc. | — | 13 | 176 |
| 94 | Stolzfus (Eli) | — | 13 | 47 |
| 95 | Waltz (D M) Drilling | — | 12 | 777 |
| 96 | Robison Drilling | — | 12 | 443 |
| 97 | Layne Ohio (Layne Christensen) | — | 12 | 346 |
| 98 | Reynolds Inc. | — | 12 | 186 |
| 99 | A-1 Well Drilling | — | 12 | 31 |
| 100 | F & S Well Drilling | — | 12 | 25 |
| 101 | Shafer Well Drilling | — | 11 | 862 |
| 102 | Stoltz (H L) & Son | — | 11 | 261 |
| 103 | Don Smith Well Drilling | — | 10 | 108 |
| 104 | Smith & Sons | — | 8 | 448 |
| 105 | Shorts (Wayne) Well Drilling | — | 8 | 54 |
| 106 | Wilson (Jim) Well Drilling | — | 7 | 1,464 |
| 107 | Sprowls Drilling Co. | — | 7 | 1,348 |
| 108 | Graham Water Services | — | 7 | 1,347 |
| 109 | Floyd's Water Well Drilling | — | 7 | 65 |
| 110 | Johnson Excavating | — | 7 | 27 |
| 111 | Arch's Well & Pump Service | — | 6 | 313 |
| 112 | Fowler (H C) | — | 6 | 823 |
| 113 | Wood Drilling | — | 6 | 112 |
| 114 | Johnson Well Drilling | — | 5 | 433 |
| 115 | Sugarcreek Drilling | — | 5 | 333 |
| 116 | H L Smith Well Drilling | — | 5 | 180 |
| 117 | Devore Drilling Co. | — | 5 | 36 |
| 118 | Ripley (S Glenn) | — | 5 | 32 |
| 119 | Murphy (R F) | — | 4 | 410 |
| 120 | T-Drilling | — | 4 | 210 |
| 121 | Phillips Water Well Drilling | — | 4 | 90 |
| 122 | K W Krock & Co. Inc. | — | 4 | 70 |
| 123 | Doug Adams Well Drilling | — | 3 | 2,323 |
| 124 | Culp Drilling Co. | — | 3 | 531 |
| 125 | Flick's Drilling Inc. | — | 3 | 355 |
| 126 | Nichols Well Drilling | — | 3 | 271 |
| 127 | Spencer Drilling Inc. | — | 3 | 261 |
| 128 | Waltz (Kenneth) & Sons | — | 3 | 195 |
| 129 | Harley (R S) | — | 3 | 164 |
| 130 | Hensel Drilling | — | 3 | 110 |
| 131 | Rhodes Inc. | — | 3 | 61 |
| 132 | Shanker Well Drilling | — | 3 | 42 |
| 133 | Weekley Well Drilling | — | 3 | 29 |
| 134 | Streetsboro Sales & Service | — | 2 | 2,180 |
| 135 | Holman (Dwight) Drilling | — | 2 | 1,708 |
| 136 | Williams (Ronald) Drilling Co. | — | 2 | 540 |
| 137 | Kendall (Clyde) | — | 2 | 298 |
| 138 | Graham (W R) | — | 2 | 190 |
| 139 | Brown Drilling | — | 2 | 152 |
| 140 | Marsh II Drilling | — | 2 | 133 |
| 141 | Burgan Drilling | — | 2 | 129 |
| 142 | C & K Well Drilling | — | 2 | 113 |
| 143 | Charm Drilling | — | 2 | 63 |
| 144 | Larry's Well Drilling | — | 2 | 57 |
| 145 | Spencer Associates | — | 2 | 32 |
| 146 | J M Drilling | — | 2 | 32 |
| 147 | Beach Drilling | — | 2 | 30 |
| 148 | Crabtree Drilling | — | 1 | 4,742 |
| 149 | J E Wright Well Drilling | — | 1 | 1,126 |
| 150 | Hurley's Water Well Drilling | — | 1 | 802 |
| 151 | Smith's Well Drilling LLC | — | 1 | 1,966 |
| 152 | Burgess Drilling Inc. | — | 1 | 3,562 |
| 153 | Automatic Septic & Well | — | 1 | 1,160 |
| 154 | L M Kettler Inc. | — | 1 | 38 |
| 155 | Vernon Gregory Well Drilling | — | 1 | 1,201 |
| 156 | National Water Services (Lanc) | — | 1 | 91 |
| 157 | Phillips Drilling Co. | — | 1 | 141 |
| 158 | Short Drilling | — | 1 | 1,580 |
| 159 | Economy Well Drillers | — | 1 | 1,188 |
| 160 | Colwell Drilling | — | 1 | 1,014 |
| 161 | Shorts (John) Well Drilling | — | 1 | 927 |
| 162 | Westfall Well Drilling | — | 1 | 846 |
| 163 | Ruby (Stan) Well Drilling | — | 1 | 750 |
| 164 | Williams Water Well Drilling | — | 1 | 679 |
| 165 | Chenoweth Well Drilling | — | 1 | 610 |
| 166 | Givens Well Drilling | — | 1 | 576 |
| 167 | Lalonde Well Drilling | — | 1 | 547 |
| 168 | J & O Drilling | — | 1 | 399 |
| 169 | Fieldman (Herm) | — | 1 | 353 |
| 170 | Bates Water Well Drilling | — | 1 | 327 |
| 171 | Clinton Well Drillers | — | 1 | 256 |
| 172 | A & A Well Drilling | — | 1 | 237 |
| 173 | Anders Drilling | — | 1 | 219 |
| 174 | Bowen Excavating And Drilling | — | 1 | 204 |
| 175 | Jackson (C W) & Sons Inc. | — | 1 | 201 |
| 176 | Mcclelland (Harry) & Son | — | 1 | 198 |
| 177 | H & H Drilling (Alliance) | — | 1 | 136 |
| 178 | Mcgill Drilling & Pump | — | 1 | 129 |
| 179 | Dixie Drilling | — | 1 | 121 |
| 180 | Rowan Drilling Co. | — | 1 | 121 |
| 181 | Snyder (L E) | — | 1 | 88 |
| 182 | Sprowls Drilling Co. (Groveport) | — | 1 | 84 |
| 183 | Tincher (Hugh) Well Drilling | — | 1 | 83 |
| 184 | Wadsworth Supply Co. | — | 1 | 78 |
| 185 | Albert (D D) | — | 1 | 72 |
| 186 | Johns Bros Drilling | — | 1 | 72 |
| 187 | Lehman & Swartz | — | 1 | 70 |
| 188 | Hall Drilling | — | 1 | 63 |
| 189 | Lehman & Lynn | — | 1 | 59 |
| 190 | Likes Drilling & Trench | — | 1 | 50 |
| 191 | Acme Well Drilling Co. Inc. | — | 1 | 31 |
| 192 | Donelson (Allen) | — | 1 | 30 |