⟁ California Well Data field records · 2026 survey

California Well Data › Napa County › Napa (94559)

Napa, CA (94559): well depth, water level & drilling cost

✓ 905 DWR records · Napa County

240 ftmedian well depth
149 ft–370 fttypical depth range
52 ftmedian static water level
32 gpmmedian yield (392 tests)

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How deep are wells in and around Napa (94559), California?

The median drilled well depth in and around Napa (94559) is 240 ft, based on 707 wells with recorded depths in the state DWR database. Half fall between 149 ft and 370 ft; 90% are shallower than 507 ft.

How much does it cost to drill a well in and around Napa (94559)?

Applying published per-foot rates to the local median depth of 240 ft: drilling and casing alone typically runs $6,000–$15,600; a complete system including pump, pressure tank, and hookup typically runs $14,400–$24,000. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around Napa (94559)?

The median static water level is 52 ft below ground surface (middle half of wells: 26 ft–90 ft), from 393 measurements.

Drilled depth distribution

0–50 ft 87 50–100 ft 31 100–150 ft 59 150–200 ft 71 200–300 ft 190 300–400 ft 111 400–600 ft 121 600+ ft 37
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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.