⟁ California Well Data field records · 2026 survey

California Well Data › Marin County › Mill Valley (94942)

Mill Valley, CA (94942): well depth, water level & drilling cost

✓ 73 DWR records · Marin County

120 ftmedian well depth
39 ft–202 fttypical depth range
25 ftmedian static water level
16 gpmmedian yield (37 tests)

Pull every recorded well near a Mill Valley (94942) address — $49

How deep are wells in and around Mill Valley (94942), California?

The median drilled well depth in and around Mill Valley (94942) is 120 ft, based on 43 wells with recorded depths in the state DWR database. Half fall between 39 ft and 202 ft; 90% are shallower than 300 ft.

How much does it cost to drill a well in and around Mill Valley (94942)?

Applying published per-foot rates to the local median depth of 120 ft: drilling and casing alone typically runs $3,000–$7,800; a complete system including pump, pressure tank, and hookup typically runs $7,200–$12,000. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in and around Mill Valley (94942)?

The median static water level is 25 ft below ground surface (middle half of wells: 12 ft–50 ft), from 30 measurements.

Drilled depth distribution

0–50 ft 13 50–100 ft 7 100–150 ft 4 150–200 ft 6 200–300 ft 7 300–400 ft 4 400–600 ft 2 600+ ft 0
Looking at a specific property in Mill Valley (94942)?

See every recorded well near any address — depths, water levels, yields, original driller's logs — in a one-time report.

Free lookup Property report — $49
Get quotes from drillers who work in Mill Valley (94942)

Free. Goes to licensed drillers working Marin County.

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.