Cornerstone Pump & Well Inc.
Recorded as the driller on 90 water wells across 11 California counties in the California Department of Water Resources (DWR) Well Completion Reports database, most in Alameda County. Well-log records span 1964–2009.
Counties served
Wells drilled by Cornerstone Pump & Well Inc., by county, across the full record.
| County | Wells drilled |
|---|---|
| Alameda County | 37 |
| Contra Costa County | 13 |
| San Francisco County | 10 |
| Santa Clara County | 9 |
| El Dorado County | 5 |
| Tuolumne County | 4 |
| San Joaquin County | 3 |
| Sacramento County | 3 |
| Sonoma County | 3 |
| San Mateo County | 2 |
| Amador County | 1 |
Well characteristics
Across the wells Cornerstone Pump & Well Inc. has drilled, the median depth is 66 ft (middle half 24 ft–240 ft), median tested yield 20 gpm, and median static water level 65 ft below ground surface. These summarize the company's own filed logs, not a marketing claim.
Original drilling logs
Recent well logs filed by Cornerstone Pump & Well Inc., straight from the public DWR record:
"Records span 1964–2009" 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 Alameda County, including Cornerstone Pump & Well Inc..
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