Signal Drilling Company
Recorded as the driller on 8,301 water wells across 37 California counties in the California Department of Water Resources (DWR) Well Completion Reports database, most in Sonoma County. Well-log records span 1930–2029.
Counties served
Wells drilled by Signal Drilling Company, by county, across the full record.
| County | Wells drilled |
|---|---|
| Sonoma County | 1,217 |
| Fresno County | 1,105 |
| Alameda County | 781 |
| Santa Clara County | 681 |
| Monterey County | 500 |
| Kern County | 454 |
| Yolo County | 392 |
| Napa County | 318 |
| Merced County | 314 |
| Mendocino County | 293 |
| Madera County | 276 |
| San Joaquin County | 275 |
…and 25 more California counties.
Well characteristics
Across the wells Signal Drilling Company has drilled, the median depth is 165 ft (middle half 95 ft–300 ft), median tested yield 25 gpm, and median static water level 42 ft below ground surface. These summarize the company's own filed logs, not a marketing claim.
"Records span 1930–2029" 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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