Sierra Exploration Drilling Co. Inc.
Recorded as the driller on 803 water wells across 6 California counties in the California Department of Water Resources (DWR) Well Completion Reports database, most in Santa Barbara County. Well-log records span 1976–2026.
Counties served
Wells drilled by Sierra Exploration Drilling Co. Inc., by county, across the full record.
| County | Wells drilled |
|---|---|
| Santa Barbara County | 582 |
| Ventura County | 180 |
| Los Angeles County | 29 |
| San Luis Obispo County | 9 |
| Yolo County | 2 |
| Kern County | 1 |
Well characteristics
Across the wells Sierra Exploration Drilling Co. Inc. has drilled, the median depth is 400 ft (middle half 270 ft–560 ft), median tested yield 40 gpm, and median static water level 95 ft below ground surface. These summarize the company's own filed logs, not a marketing claim.
Original drilling logs
Recent well logs filed by Sierra Exploration Drilling Co. Inc., straight from the public DWR record:
"Records span 1976–2026" 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 Santa Barbara County, including Sierra Exploration Drilling Co. Inc..
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