California Well Data › Colusa County
Colusa County, California: well depth, water level & drilling cost
✓ 3,595 DWR records · verified 2026-10-02
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How deep are wells in Colusa County, California?
The median drilled well depth in Colusa County is 244 ft, based on 3,585 wells with recorded depths in the state DWR database. Half of all wells fall between 132 ft and 480 ft; 90% are shallower than 724 ft. Wells drilled since 2016 have a median depth of 540 ft.
How much does it cost to drill a well in Colusa County?
Applying published per-foot rates to the local median depth of 540 ft: drilling and casing alone typically runs $13,500–$35,100; a complete system including pump, pressure tank, and hookup typically runs $32,400–$54,000. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Colusa County?
The median static water level is 51 ft below ground surface (middle half of wells: 22 ft–146 ft), from 375 measurements.
How much water do wells in Colusa County produce?
The median tested yield is 100 gpm (middle half: 40 gpm–1,000 gpm), from 846 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in Colusa County?
Companies by number of wells completed in this county since 2016, per filed well completion reports (California Department of Water Resources).
| Driller | Wells since 2016 |
|---|---|
| SULLIVAN DRILLING INC | 221 |
| EATON DRILLING CO LLC | 38 |
| PARKS WATER RESOURCES | 29 |
| WELL INDUSTRIES INC | 10 |
| NOR - CAL PUMP & WELL DRILLING INC | 9 |
| ROADRUNNER DRILLING & PUMP COMPANY INC | 7 |
| PARKS WATER RESOURCES LLC | 4 |
| CACHE CREEK DRILLING | 4 |
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Well records by ZIP code in Colusa County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Arbuckle (95912) — 1,006 wells, median 400 ft
- Colusa (95932) — 815 wells, median 190 ft
- Williams (95987) — 558 wells, median 230 ft
- Grimes (95950) — 495 wells, median 193 ft
- Stonyford (95979) — 293 wells, median 116 ft
- Maxwell (95955) — 230 wells, median 200 ft
Method: medians computed from DWR records (filed well completion reports, water-supply uses only (destruction, repair and monitoring wells excluded); depths 0–5,000 ft). Cost estimate applies published per-foot ranges (checked 2026-06-11) to the local median depth — full methodology & sources.