Gwin Drilling Co.
Recorded as the driller on 477 water wells across 18 Illinois counties in the Illinois State Geological Survey water well records, most in Randolph County. Well-log records span 1920–1976.
Counties served
Wells drilled by Gwin Drilling Co., by county, across the full record.
| County | Wells drilled |
|---|---|
| Randolph County | 214 |
| Jackson County | 151 |
| Perry County | 24 |
| Monroe County | 23 |
| Washington County | 17 |
| Williamson County | 14 |
| Union County | 9 |
| Hardin County | 7 |
| Pope County | 4 |
| St. Clair County | 4 |
| Alexander County | 2 |
| Saline County | 2 |
…and 6 more Illinois counties.
Well characteristics
Across the wells Gwin Drilling Co. has drilled, the median depth is 180 ft (middle half 106 ft–260 ft), median tested yield 7 gpm, and median static water level — below ground surface. These summarize the company's own filed logs, not a marketing claim.
Original drilling logs
Recent well logs filed by Gwin Drilling Co., straight from the public ISGS record:
"Records span 1920–1976" refers to the earliest and latest well logs attributed to this company in the ISGS database — the state digitized older paper logs, so the first date is the oldest record on file, not necessarily the company's founding year.
Free for property owners. We route your request only to licensed drillers who actually file well logs in Randolph County — never sold elsewhere.
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