California Well Data › Napa County
Napa County, California: well depth, water level & drilling cost
✓ 9,864 DWR records · verified 2026-10-02
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How deep are wells in Napa County, California?
The median drilled well depth in Napa County is 310 ft, based on 8,036 wells with recorded depths in the state DWR database. Half of all wells fall between 200 ft and 456 ft; 90% are shallower than 600 ft. Wells drilled since 2016 have a median depth of 455 ft.
How much does it cost to drill a well in Napa County?
Applying published per-foot rates to the local median depth of 455 ft: drilling and casing alone typically runs $11,375–$29,575; a complete system including pump, pressure tank, and hookup typically runs $27,300–$45,500. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Napa County?
The median static water level is 50 ft below ground surface (middle half of wells: 22 ft–110 ft), from 4,783 measurements.
How much water do wells in Napa County produce?
The median tested yield is 35 gpm (middle half: 15 gpm–80 gpm), from 4,902 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in Napa County?
Companies by number of wells completed in this county since 2016, per filed well completion reports (California Department of Water Resources).
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Well records by ZIP code in Napa County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Napa (94581) — 1,728 wells, median 330 ft
- Calistoga (94515) — 1,421 wells, median 250 ft
- Yountville (94599) — 1,121 wells, median 320 ft
- Napa (94559) — 905 wells, median 240 ft
- Saint Helena (94574) — 737 wells, median 417 ft
- Rutherford (94573) — 620 wells, median 370 ft
- Deer Park (94576) — 619 wells, median 350 ft
- Napa (94558) — 553 wells, median 264 ft
- Oakville (94562) — 489 wells, median 360 ft
- Pope Valley (94567) — 318 wells, median 213 ft
- Angwin (94508) — 260 wells, median 400 ft
- American Canyon (94503) — 128 wells, median 150 ft
- Vallejo (94589) — 111 wells, median 242 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.