⟁ California Well Data field records · 2026 survey

California Well Data › Marin County

Marin County, California: well depth, water level & drilling cost

✓ 3,929 DWR records · verified 2026-08-14

150 ftmedian well depth
56 ft–250 fttypical depth range
30 ftmedian static water level
9 gpmmedian yield (1,482 tests)

How deep are wells in Marin County, California?

The median drilled well depth in Marin County is 150 ft, based on 2,321 wells with recorded depths in the state DWR database. Half of all wells fall between 56 ft and 250 ft; 90% are shallower than 340 ft. Wells drilled since 2016 have a median depth of 165 ft.

How much does it cost to drill a well in Marin County?

Applying published per-foot rates to the local median depth of 165 ft: drilling and casing alone typically runs $4,125–$10,725; a complete system including pump, pressure tank, and hookup typically runs $9,900–$16,500. Actual quotes depend on site access, geology, and casing requirements.

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What is the static water level in Marin County?

The median static water level is 30 ft below ground surface (middle half of wells: 15 ft–62 ft), from 1,178 measurements.

How much water do wells in Marin County produce?

The median tested yield is 9 gpm (middle half: 4 gpm–20 gpm), from 1,482 pump tests. A typical household needs 5–10 gpm.

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Drilled depth distribution

0–50 ft 491 50–100 ft 325 100–150 ft 307 150–200 ft 270 200–300 ft 508 300–400 ft 281 400–600 ft 127 600+ ft 12

Who drills wells in Marin County?

Companies by number of wells completed in this county since 2016, per filed well completion reports (California Department of Water Resources).

DrillerWells since 2016
WEEKS DRILLING AND PUMP CO32
MICKELSON ENTERPRISES INC19
CLEAR HEART DRILLING INC19
CASCADE DRILLING LP16
FISCH BROS DRILLING14
AMERICAN CONSTRUCTION AND SUPPLY INC13
GREGG DRILLING LLC13
IRWIN WELL DRILLING11

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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). Cost estimate applies published per-foot ranges (checked 2026-06-11) to the local median depth — full methodology & sources.