⟁ California Well Data field records · 2026 survey

California Well Data › Napa County › Napa (94558)

Napa, CA (94558): well depth, water level & drilling cost

✓ 553 DWR records · Napa County

264 ftmedian well depth
160 ft–410 fttypical depth range
60 ftmedian static water level
25 gpmmedian yield (235 tests)

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How deep are wells in and around Napa (94558), California?

The median drilled well depth in and around Napa (94558) is 264 ft, based on 481 wells with recorded depths in the state DWR database. Half fall between 160 ft and 410 ft; 90% are shallower than 580 ft.

How much does it cost to drill a well in and around Napa (94558)?

Applying published per-foot rates to the local median depth of 264 ft: drilling and casing alone typically runs $6,600–$17,160; a complete system including pump, pressure tank, and hookup typically runs $15,840–$26,400. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around Napa (94558)?

The median static water level is 60 ft below ground surface (middle half of wells: 25 ft–189 ft), from 219 measurements.

Drilled depth distribution

0–50 ft 5 50–100 ft 40 100–150 ft 58 150–200 ft 67 200–300 ft 96 300–400 ft 78 400–600 ft 91 600+ ft 46
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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.