⟁ California Well Data field records · 2026 survey

California Well Data › Alameda County

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

✓ 13,241 DWR records · verified 2026-08-14

74 ftmedian well depth
25 ft–229 fttypical depth range
33 ftmedian static water level
25 gpmmedian yield (1,043 tests)

How deep are wells in Alameda County, California?

The median drilled well depth in Alameda County is 74 ft, based on 7,536 wells with recorded depths in the state DWR database. Half of all wells fall between 25 ft and 229 ft; 90% are shallower than 380 ft. Wells drilled since 2016 have a median depth of 50 ft.

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

Applying published per-foot rates to the local median depth of 50 ft: drilling and casing alone typically runs $1,250–$3,250; a complete system including pump, pressure tank, and hookup typically runs $3,000–$5,000. Actual quotes depend on site access, geology, and casing requirements.

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What is the static water level in Alameda County?

The median static water level is 33 ft below ground surface (middle half of wells: 12 ft–70 ft), from 1,668 measurements.

How much water do wells in Alameda County produce?

The median tested yield is 25 gpm (middle half: 10 gpm–60 gpm), from 1,043 pump tests. A typical household needs 5–10 gpm.

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Drilled depth distribution

0–50 ft 3,015 50–100 ft 1,071 100–150 ft 771 150–200 ft 399 200–300 ft 995 300–400 ft 580 400–600 ft 543 600+ ft 162

Who drills wells in Alameda 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
GREGG DRILLING LLC128
AMERICAN CONSTRUCTION AND SUPPLY INC119
T S A DRILLING INC DBA PENECORE DRILLING81
GREGG DRILLING & TESTING INC70
CASCADE DRILLING L P55
CASCADE DRILLING LP52
ALTAMONT WATER WELL AND PUMP46
PITCHER DRILLING CO33

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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.