⟁ California Well Data field records · 2026 survey

California Well Data › San Mateo County › Atherton (94027)

Atherton, CA (94027): well depth, water level & drilling cost

✓ 447 DWR records · San Mateo County

213 ftmedian well depth
143 ft–373 fttypical depth range
40 ftmedian static water level
36 gpmmedian yield (118 tests)

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How deep are wells in and around Atherton (94027), California?

The median drilled well depth in and around Atherton (94027) is 213 ft, based on 400 wells with recorded depths in the state DWR database. Half fall between 143 ft and 373 ft; 90% are shallower than 450 ft.

How much does it cost to drill a well in and around Atherton (94027)?

Applying published per-foot rates to the local median depth of 213 ft: drilling and casing alone typically runs $5,325–$13,845; a complete system including pump, pressure tank, and hookup typically runs $12,780–$21,300. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around Atherton (94027)?

The median static water level is 40 ft below ground surface (middle half of wells: 32 ft–52 ft), from 117 measurements.

Drilled depth distribution

0–50 ft 51 50–100 ft 16 100–150 ft 35 150–200 ft 27 200–300 ft 156 300–400 ft 20 400–600 ft 92 600+ ft 3
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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.