Dillan Well Drilling Inc.
Recorded as the driller on 2,861 water wells across 17 Ohio counties in the Ohio Department of Natural Resources (ODNR) Division of Geological Survey water-well log database, most in Columbiana County. Well-log records span 1981–2026.
Counties served
Wells drilled by Dillan Well Drilling Inc., by county, across the full record.
| County | Wells drilled |
|---|---|
| Columbiana County | 1,303 |
| Mahoning County | 1,181 |
| Trumbull County | 155 |
| Portage County | 77 |
| Carroll County | 47 |
| Jefferson County | 31 |
| Stark County | 21 |
| Belmont County | 16 |
| Harrison County | 9 |
| Ashtabula County | 6 |
| Geauga County | 5 |
| Tuscarawas County | 5 |
…and 5 more Ohio counties.
Well characteristics
Across the wells Dillan Well Drilling Inc. has drilled, the median depth is 160 ft (middle half 120 ft–220 ft), median tested yield 15 gpm, and median static water level 41 ft below ground surface. These summarize the company's own filed logs, not a marketing claim.
Original drilling logs
Recent well logs filed by Dillan Well Drilling Inc., straight from the public ODNR record:
"Records span 1981–2026" refers to the earliest and latest well logs attributed to this company in the ODNR database — the state digitized older paper logs, so the first date is the oldest record on file, not necessarily the company's founding year.
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