⟁ California Well Data field records · 2026 survey

California Well Data › San Mateo County › San Mateo (94401)

San Mateo, CA (94401): well depth, water level & drilling cost

✓ 255 DWR records · San Mateo County

30 ftmedian well depth
25 ft–120 fttypical depth range
7 ftmedian static water level
15 gpmmedian yield (5 tests)

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How deep are wells in and around San Mateo (94401), California?

The median drilled well depth in and around San Mateo (94401) is 30 ft, based on 123 wells with recorded depths in the state DWR database. Half fall between 25 ft and 120 ft; 90% are shallower than 253 ft.

How much does it cost to drill a well in and around San Mateo (94401)?

Applying published per-foot rates to the local median depth of 30 ft: drilling and casing alone typically runs $750–$1,950; a complete system including pump, pressure tank, and hookup typically runs $1,800–$3,000. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around San Mateo (94401)?

The median static water level is 7 ft below ground surface (middle half of wells: 6 ft–17 ft), from 26 measurements.

Drilled depth distribution

0–50 ft 83 50–100 ft 4 100–150 ft 9 150–200 ft 3 200–300 ft 15 300–400 ft 8 400–600 ft 1 600+ ft 0
Looking at a specific property in San Mateo (94401)?

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Part of San Mateo 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.