Retzlaff & Gregorich
Recorded as the driller on 1,098 water wells across 8 Wisconsin counties in the Wisconsin Department of Natural Resources Groundwater Retrieval Network (GRN) well-construction records, most in Kewaunee County. Well-log records span 2007–2026.
Counties served
Wells drilled by Retzlaff & Gregorich, by county, across the full record.
| County | Wells drilled |
|---|---|
| Kewaunee County | 465 |
| Door County | 286 |
| Brown County | 271 |
| Manitowoc County | 64 |
| Oconto County | 7 |
| Shawano County | 3 |
| Marinette County | 1 |
| Sheboygan County | 1 |
Well characteristics
Across the wells Retzlaff & Gregorich has drilled, the median depth is 183 ft (middle half 140 ft–243 ft), median tested yield 25 gpm, and median static water level 30 ft below ground surface. These summarize the company's own filed logs, not a marketing claim.
Original drilling logs
Recent well logs filed by Retzlaff & Gregorich, straight from the public WI DNR record:
"Records span 2007–2026" refers to the earliest and latest well logs attributed to this company in the WI DNR 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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