⟁ California Well Data field records · 2026 survey

California Well Data › San Mateo County › San Mateo (94402)

San Mateo, CA (94402): well depth, water level & drilling cost

✓ 98 DWR records · San Mateo County

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

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How deep are wells in and around San Mateo (94402), California?

The median drilled well depth in and around San Mateo (94402) is 39 ft, based on 65 wells with recorded depths in the state DWR database. Half fall between 30 ft and 120 ft; 90% are shallower than 200 ft.

How much does it cost to drill a well in and around San Mateo (94402)?

Applying published per-foot rates to the local median depth of 39 ft: drilling and casing alone typically runs $975–$2,535; a complete system including pump, pressure tank, and hookup typically runs $2,340–$3,900. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around San Mateo (94402)?

The median static water level is 15 ft below ground surface (middle half of wells: 15 ft–15 ft), from 34 measurements.

Drilled depth distribution

0–50 ft 39 50–100 ft 0 100–150 ft 15 150–200 ft 1 200–300 ft 8 300–400 ft 0 400–600 ft 2 600+ ft 0
Looking at a specific property in San Mateo (94402)?

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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.