⟁ California Well Data field records · 2026 survey

California Well Data › Napa County › Napa (94581)

Napa, CA (94581): well depth, water level & drilling cost

✓ 1,728 DWR records · Napa County

330 ftmedian well depth
195 ft–470 fttypical depth range
70 ftmedian static water level
40 gpmmedian yield (872 tests)

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How deep are wells in and around Napa (94581), California?

The median drilled well depth in and around Napa (94581) is 330 ft, based on 1,408 wells with recorded depths in the state DWR database. Half fall between 195 ft and 470 ft; 90% are shallower than 600 ft.

How much does it cost to drill a well in and around Napa (94581)?

Applying published per-foot rates to the local median depth of 330 ft: drilling and casing alone typically runs $8,250–$21,450; a complete system including pump, pressure tank, and hookup typically runs $19,800–$33,000. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around Napa (94581)?

The median static water level is 70 ft below ground surface (middle half of wells: 32 ft–141 ft), from 859 measurements.

Drilled depth distribution

0–50 ft 59 50–100 ft 55 100–150 ft 120 150–200 ft 125 200–300 ft 214 300–400 ft 297 400–600 ft 381 600+ ft 157
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Part of Napa County well records.

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), grouped by ZIP from the recorded address. Cost estimate applies published per-foot ranges to the local median depth — full methodology & sources.