Les Petersen Drilling & Pump Inc.
Recorded as the driller on 4,098 water wells across 7 California counties in the California Department of Water Resources (DWR) Well Completion Reports database, most in Sonoma County. Well-log records span 1933–2026.
Counties served
Wells drilled by Les Petersen Drilling & Pump Inc., by county, across the full record.
| County | Wells drilled |
|---|---|
| Sonoma County | 3,898 |
| Napa County | 119 |
| Marin County | 55 |
| Mendocino County | 23 |
| San Mateo County | 1 |
| Nevada County | 1 |
| Sierra County | 1 |
Well characteristics
Across the wells Les Petersen Drilling & Pump Inc. has drilled, the median depth is 250 ft (middle half 167 ft–375 ft), median tested yield 40 gpm, and median static water level 40 ft below ground surface. These summarize the company's own filed logs, not a marketing claim.
Original drilling logs
Recent well logs filed by Les Petersen Drilling & Pump Inc., straight from the public DWR record:
"Records span 1933–2026" refers to the earliest and latest well logs attributed to this company in the DWR 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. Goes to licensed drillers working Sonoma County, including Les Petersen Drilling & Pump Inc..
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This page is built from the public DWR well-log record and helps property owners find a driller. Claim it (free) to confirm the details are right and give customers a way to reach you.
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