California Well Data › Marin County
Marin County, California: well depth, water level & drilling cost
✓ 3,929 DWR records · verified 2026-10-02
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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 150 ft: drilling and casing alone typically runs $3,750–$9,750; a complete system including pump, pressure tank, and hookup typically runs $9,000–$15,000. Actual quotes depend on site access, geology, and casing requirements.
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.
Drilled depth distribution
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).
| Driller | Wells since 2016 |
|---|---|
| WEEKS DRILLING AND PUMP CO | 32 |
| MICKELSON ENTERPRISES INC | 19 |
| CLEAR HEART DRILLING INC | 19 |
| CASCADE DRILLING LP | 16 |
| FISCH BROS DRILLING | 14 |
| AMERICAN CONSTRUCTION AND SUPPLY INC | 13 |
| GREGG DRILLING LLC | 13 |
| IRWIN WELL DRILLING | 11 |
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Well records by ZIP code in Marin County
Median depth, water level, and yield for each ZIP code with recorded wells.
- San Rafael (94901) — 347 wells, median 195 ft
- Ross (94957) — 189 wells, median 190 ft
- Tomales (94971) — 188 wells, median 143 ft
- Nicasio (94946) — 172 wells, median 150 ft
- San Rafael (94912) — 162 wells, median 150 ft
- Novato (94947) — 145 wells, median 52 ft
- Kentfield (94914) — 132 wells, median 200 ft
- Point Reyes Station (94956) — 131 wells, median 220 ft
- Bolinas (94924) — 124 wells, median 155 ft
- Belvedere Tiburon (94920) — 122 wells, median 175 ft
- Novato (94998) — 120 wells, median 160 ft
- Novato (94949) — 116 wells, median 74 ft
- San Geronimo (94963) — 112 wells, median 200 ft
- San Anselmo (94960) — 108 wells, median 48 ft
- Inverness (94937) — 96 wells, median 200 ft
- Marshall (94940) — 96 wells, median 120 ft
- Mill Valley (94941) — 93 wells, median 152 ft
- Mill Valley (94942) — 73 wells, median 120 ft
- Fairfax (94978) — 71 wells, median 100 ft
- San Anselmo (94979) — 62 wells, median 120 ft
- Corte Madera (94925) — 54 wells, median 244 ft
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.