⟁ California Well Data field records · 2026 survey

California Well Data › Contra Costa County

Contra Costa County, California: well depth, water level & drilling cost

✓ 11,321 DWR records · verified 2026-08-14

140 ftmedian well depth
61 ft–240 fttypical depth range
30 ftmedian static water level
20 gpmmedian yield (1,333 tests)

How deep are wells in Contra Costa County, California?

The median drilled well depth in Contra Costa County is 140 ft, based on 6,380 wells with recorded depths in the state DWR database. Half of all wells fall between 61 ft and 240 ft; 90% are shallower than 320 ft. Wells drilled since 2016 have a median depth of 150 ft.

How much does it cost to drill a well in Contra Costa County?

Applying published per-foot rates to the local median depth of 150 ft: drilling and casing alone typically runs $3,750–$9,750; a complete system including pump, pressure tank, and hookup typically runs $9,000–$15,000. Actual quotes depend on site access, geology, and casing requirements.

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What is the static water level in Contra Costa County?

The median static water level is 30 ft below ground surface (middle half of wells: 16 ft–48 ft), from 2,507 measurements.

How much water do wells in Contra Costa County produce?

The median tested yield is 20 gpm (middle half: 6 gpm–40 gpm), from 1,333 pump tests. A typical household needs 5–10 gpm.

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Drilled depth distribution

0–50 ft 1,301 50–100 ft 914 100–150 ft 1,150 150–200 ft 787 200–300 ft 1,190 300–400 ft 722 400–600 ft 248 600+ ft 68

Who drills wells in Contra Costa 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
CASCADE DRILLING L P96
MARTELL WATER SYSTEMS INC78
PACIFIC COAST WELL & PUMP INC52
CORRPRO COMPANIES INC52
AMERICAN CONSTRUCTION AND SUPPLY INC50
CASTLE WELL DRILLING INC44
HENNINGS BROS DRILLING CO INC34
GREGG DRILLING LLC30

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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.