Tanko Well Drilling
Recorded as the driller on 3,311 water wells across 10 California counties in the California Department of Water Resources (DWR) Well Completion Reports database, most in Calaveras County. Well-log records span 1950–2026.
Counties served
Wells drilled by Tanko Well Drilling, by county, across the full record.
| County | Wells drilled |
|---|---|
| Calaveras County | 2,693 |
| Amador County | 560 |
| Tuolumne County | 17 |
| El Dorado County | 11 |
| Nevada County | 9 |
| San Joaquin County | 9 |
| Placer County | 8 |
| Stanislaus County | 2 |
| Alpine County | 1 |
| Merced County | 1 |
Well characteristics
Across the wells Tanko Well Drilling has drilled, the median depth is 300 ft (middle half 230 ft–400 ft), median tested yield 23 gpm, and median static water level 68 ft below ground surface. These summarize the company's own filed logs, not a marketing claim.
"Records span 1950–2026" 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.
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