⟁ California Well Data field records · 2026 survey

California Well Data › San Mateo County

San Mateo County, California: well depth, water level & drilling cost

✓ 7,601 DWR records · verified 2026-08-14

120 ftmedian well depth
60 ft–240 fttypical depth range
27 ftmedian static water level
14 gpmmedian yield (1,155 tests)

How deep are wells in San Mateo County, California?

The median drilled well depth in San Mateo County is 120 ft, based on 4,503 wells with recorded depths in the state DWR database. Half of all wells fall between 60 ft and 240 ft; 90% are shallower than 365 ft. Wells drilled since 2016 have a median depth of 160 ft.

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

Applying published per-foot rates to the local median depth of 160 ft: drilling and casing alone typically runs $4,000–$10,400; a complete system including pump, pressure tank, and hookup typically runs $9,600–$16,000. Actual quotes depend on site access, geology, and casing requirements.

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What is the static water level in San Mateo County?

The median static water level is 27 ft below ground surface (middle half of wells: 14 ft–59 ft), from 1,218 measurements.

How much water do wells in San Mateo County produce?

The median tested yield is 14 gpm (middle half: 7 gpm–30 gpm), from 1,155 pump tests. A typical household needs 5–10 gpm.

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Drilled depth distribution

0–50 ft 940 50–100 ft 852 100–150 ft 660 150–200 ft 342 200–300 ft 910 300–400 ft 391 400–600 ft 319 600+ ft 89

Who drills wells in San Mateo 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
AMERICAN CONSTRUCTION AND SUPPLY INC144
EARTH FLOW DRILLING COMPANY93
GREGG DRILLING & TESTING INC65
NATIONAL E W P INC60
MAGGIORA BROS DRILLING INC56
CASCADE DRILLING L P49
PITCHER DRILLING CO48
GREGG DRILLING LLC36

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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.