⟁ California Well Data field records · 2026 survey

California Well Data › Napa County

Napa County, California: well depth, water level & drilling cost

✓ 9,860 DWR records · verified 2026-08-14

310 ftmedian well depth
200 ft–456 fttypical depth range
50 ftmedian static water level
35 gpmmedian yield (4,898 tests)

How deep are wells in Napa County, California?

The median drilled well depth in Napa County is 310 ft, based on 8,032 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.

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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 4,779 measurements.

How much water do wells in Napa County produce?

The median tested yield is 35 gpm (middle half: 15 gpm–80 gpm), from 4,898 pump tests. A typical household needs 5–10 gpm.

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Drilled depth distribution

0–50 ft 320 50–100 ft 355 100–150 ft 644 150–200 ft 664 200–300 ft 1,515 300–400 ft 1,670 400–600 ft 1,946 600+ ft 918

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).

DrillerWells since 2016
HUCKFELDT WELL DRILLING INC387
MC LEAN & WILLIAMS INC122
WEEKS DRILLING AND PUMP CO79
BESS D PUMP & WELL ELECT72
PULLIAM WELL EXPLORATION INC41
SLAGLE DRILLING CORP39
BILL PULLIAM36
LES PETERSEN DRILLING & PUMP INC28

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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.