Sullivan Drilling Inc.
Recorded as the driller on 1,387 water wells across 17 California counties in the California Department of Water Resources (DWR) Well Completion Reports database, most in Glenn County. Well-log records span 1952–2026.
Counties served
Wells drilled by Sullivan Drilling Inc., by county, across the full record.
| County | Wells drilled |
|---|---|
| Glenn County | 394 |
| Tehama County | 288 |
| Colusa County | 246 |
| Yolo County | 232 |
| Solano County | 85 |
| Sutter County | 56 |
| Butte County | 50 |
| Yuba County | 13 |
| Placer County | 6 |
| Shasta County | 5 |
| Sacramento County | 4 |
| Sonoma County | 2 |
…and 5 more California counties.
Well characteristics
Across the wells Sullivan Drilling Inc. has drilled, the median depth is 370 ft (middle half 250 ft–590 ft), median tested yield 150 gpm, and median static water level 66 ft below ground surface. These summarize the company's own filed logs, not a marketing claim.
"Records span 1952–2026" 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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