⟁ California Well Data field records · 2026 survey

California Well Data › Napa County › Saint Helena (94574)

Saint Helena, CA (94574): well depth, water level & drilling cost

✓ 737 DWR records · Napa County

417 ftmedian well depth
300 ft–540 fttypical depth range
48 ftmedian static water level
35 gpmmedian yield (451 tests)

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How deep are wells in and around Saint Helena (94574), California?

The median drilled well depth in and around Saint Helena (94574) is 417 ft, based on 592 wells with recorded depths in the state DWR database. Half fall between 300 ft and 540 ft; 90% are shallower than 670 ft.

How much does it cost to drill a well in and around Saint Helena (94574)?

Applying published per-foot rates to the local median depth of 417 ft: drilling and casing alone typically runs $10,425–$27,105; a complete system including pump, pressure tank, and hookup typically runs $25,020–$41,700. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around Saint Helena (94574)?

The median static water level is 48 ft below ground surface (middle half of wells: 25 ft–100 ft), from 438 measurements.

Drilled depth distribution

0–50 ft 0 50–100 ft 5 100–150 ft 16 150–200 ft 30 200–300 ft 87 300–400 ft 120 400–600 ft 218 600+ ft 116
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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.