⟁ California Well Data field records · 2026 survey

California Well Data › Marin County › Mill Valley (94941)

Mill Valley, CA (94941): well depth, water level & drilling cost

✓ 93 DWR records · Marin County

152 ftmedian well depth
71 ft–260 fttypical depth range
40 ftmedian static water level
7 gpmmedian yield (38 tests)

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How deep are wells in and around Mill Valley (94941), California?

The median drilled well depth in and around Mill Valley (94941) is 152 ft, based on 36 wells with recorded depths in the state DWR database. Half fall between 71 ft and 260 ft; 90% are shallower than 300 ft.

How much does it cost to drill a well in and around Mill Valley (94941)?

Applying published per-foot rates to the local median depth of 152 ft: drilling and casing alone typically runs $3,800–$9,880; a complete system including pump, pressure tank, and hookup typically runs $9,120–$15,200. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around Mill Valley (94941)?

The median static water level is 40 ft below ground surface (middle half of wells: 22 ft–76 ft), from 27 measurements.

Drilled depth distribution

0–50 ft 7 50–100 ft 5 100–150 ft 4 150–200 ft 7 200–300 ft 7 300–400 ft 5 400–600 ft 1 600+ ft 0
Looking at a specific property in Mill Valley (94941)?

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Part of Marin 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.