California Well Data › Sonoma County
Sonoma County, California: well depth, water level & drilling cost
✓ 37,903 DWR records · verified 2026-10-02
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How deep are wells in Sonoma County, California?
The median drilled well depth in Sonoma County is 195 ft, based on 29,081 wells with recorded depths in the state DWR database. Half of all wells fall between 100 ft and 295 ft; 90% are shallower than 420 ft. Wells drilled since 2016 have a median depth of 290 ft.
How much does it cost to drill a well in Sonoma County?
Applying published per-foot rates to the local median depth of 290 ft: drilling and casing alone typically runs $7,250–$18,850; a complete system including pump, pressure tank, and hookup typically runs $17,400–$29,000. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Sonoma County?
The median static water level is 40 ft below ground surface (middle half of wells: 20 ft–72 ft), from 17,891 measurements.
How much water do wells in Sonoma County produce?
The median tested yield is 25 gpm (middle half: 15 gpm–50 gpm), from 19,539 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in Sonoma 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 |
|---|---|
| WEEKS DRILLING AND PUMP CO | 901 |
| FISCH BROS DRILLING | 728 |
| LES PETERSEN DRILLING & PUMP INC | 326 |
| IRWIN WELL DRILLING | 305 |
| MICKELSON ENTERPRISES INC | 135 |
| CLEAR HEART DRILLING INC | 127 |
| CASCADE DRILLING L P | 83 |
| NUTTING AND JENSEN DRILLING | 37 |
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Well records by ZIP code in Sonoma County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Healdsburg (95448) — 2,462 wells, median 172 ft
- Sebastopol (95472) — 2,093 wells, median 215 ft
- Graton (95444) — 1,686 wells, median 200 ft
- Windsor (95492) — 1,679 wells, median 177 ft
- Santa Rosa (95407) — 1,426 wells, median 114 ft
- Cotati (94931) — 1,281 wells, median 245 ft
- Geyserville (95441) — 1,265 wells, median 164 ft
- Santa Rosa (95403) — 1,243 wells, median 168 ft
- Sebastopol (95473) — 1,158 wells, median 190 ft
- Cloverdale (95425) — 1,128 wells, median 120 ft
- Petaluma (94952) — 1,065 wells, median 220 ft
- Vineburg (95487) — 1,061 wells, median 380 ft
- Fulton (95439) — 1,009 wells, median 160 ft
- Santa Rosa (95401) — 999 wells, median 116 ft
- Camp Meeker (95419) — 990 wells, median 99 ft
- Santa Rosa (95409) — 967 wells, median 252 ft
- Petaluma (94999) — 843 wells, median 230 ft
- Kenwood (95452) — 830 wells, median 308 ft
- Forestville (95436) — 785 wells, median 140 ft
- Rohnert Park (94928) — 687 wells, median 220 ft
- Penngrove (94951) — 680 wells, median 260 ft
- Glen Ellen (95442) — 555 wells, median 328 ft
- Santa Rosa (95405) — 536 wells, median 173 ft
- Sonoma (95476) — 507 wells, median 220 ft
- Santa Rosa (95404) — 449 wells, median 61 ft
- Santa Rosa (95402) — 409 wells, median 120 ft
- Occidental (95465) — 391 wells, median 100 ft
- Valley Ford (94972) — 390 wells, median 240 ft
- Petaluma (94953) — 384 wells, median 178 ft
- El Verano (95433) — 372 wells, median 330 ft
- Rohnert Park (94926) — 348 wells, median 213 ft
- Petaluma (94954) — 308 wells, median 300 ft
- Bodega (94922) — 301 wells, median 120 ft
- Boyes Hot Springs (95416) — 279 wells, median 338 ft
- Cazadero (95421) — 269 wells, median 190 ft
- Eldridge (95431) — 255 wells, median 360 ft
- Guerneville (95446) — 225 wells, median 96 ft
- Novato (94948) — 223 wells, median 228 ft
- Rio Nido (95471) — 218 wells, median 160 ft
- Jenner (95450) — 134 wells, median 190 ft
- Stewarts Point (95480) — 117 wells, median 200 ft
- Duncans Mills (95430) — 110 wells, median 70 ft
- Villa Grande (95486) — 100 wells, median 85 ft
- Annapolis (95412) — 96 wells, median 180 ft
- Bodega Bay (94923) — 82 wells, median 78 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.