⟁ California Well Data field records · 2026 survey

California Well Data › San Mateo County › Portola Valley (94028)

Portola Valley, CA (94028): well depth, water level & drilling cost

✓ 362 DWR records · San Mateo County

240 ftmedian well depth
157 ft–293 fttypical depth range
53 ftmedian static water level
12 gpmmedian yield (124 tests)

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How deep are wells in and around Portola Valley (94028), California?

The median drilled well depth in and around Portola Valley (94028) is 240 ft, based on 256 wells with recorded depths in the state DWR database. Half fall between 157 ft and 293 ft; 90% are shallower than 400 ft.

How much does it cost to drill a well in and around Portola Valley (94028)?

Applying published per-foot rates to the local median depth of 240 ft: drilling and casing alone typically runs $6,000–$15,600; a complete system including pump, pressure tank, and hookup typically runs $14,400–$24,000. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around Portola Valley (94028)?

The median static water level is 53 ft below ground surface (middle half of wells: 30 ft–95 ft), from 102 measurements.

Drilled depth distribution

0–50 ft 8 50–100 ft 10 100–150 ft 33 150–200 ft 25 200–300 ft 116 300–400 ft 37 400–600 ft 21 600+ ft 6
Looking at a specific property in Portola Valley (94028)?

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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.