California Well Data › San Mateo County
San Mateo County, California: well depth, water level & drilling cost
✓ 7,610 DWR records · verified 2026-10-02
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How deep are wells in San Mateo County, California?
The median drilled well depth in San Mateo County is 120 ft, based on 4,512 wells with recorded depths in the state DWR database. Half of all wells fall between 60 ft and 240 ft; 90% are shallower than 365 ft. Wells drilled since 2016 have a median depth of 155 ft.
How much does it cost to drill a well in San Mateo County?
Applying published per-foot rates to the local median depth of 155 ft: drilling and casing alone typically runs $3,875–$10,075; a complete system including pump, pressure tank, and hookup typically runs $9,300–$15,500. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in San Mateo County?
The median static water level is 27 ft below ground surface (middle half of wells: 14 ft–59 ft), from 1,218 measurements.
How much water do wells in San Mateo County produce?
The median tested yield is 14 gpm (middle half: 7 gpm–30 gpm), from 1,157 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in San Mateo County?
Companies by number of wells completed in this county since 2016, per filed well completion reports (California Department of Water Resources).
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Well records by ZIP code in San Mateo County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Half Moon Bay (94019) — 447 wells, median 87 ft
- Atherton (94027) — 447 wells, median 213 ft
- South San Francisco (94083) — 375 wells, median 20 ft
- Portola Valley (94028) — 362 wells, median 240 ft
- El Granada (94018) — 335 wells, median 140 ft
- Palo Alto (94303) — 294 wells, median 80 ft
- San Carlos (94070) — 293 wells, median 25 ft
- Pescadero (94060) — 275 wells, median 118 ft
- Redwood City (94062) — 266 wells, median 220 ft
- Redwood City (94063) — 257 wells, median 140 ft
- San Mateo (94401) — 255 wells, median 30 ft
- Redwood City (94061) — 248 wells, median 96 ft
- San Bruno (94066) — 242 wells, median 200 ft
- Burlingame (94011) — 209 wells, median 120 ft
- San Mateo (94403) — 190 wells, median 70 ft
- South San Francisco (94080) — 180 wells, median 49 ft
- La Honda (94020) — 173 wells, median 230 ft
- Daly City (94015) — 171 wells, median 40 ft
- Daly City (94016) — 162 wells, median 96 ft
- San Gregorio (94074) — 159 wells, median 160 ft
- Menlo Park (94026) — 151 wells, median 200 ft
- Palo Alto (94304) — 139 wells, median 40 ft
- Menlo Park (94025) — 136 wells, median 140 ft
- Loma Mar (94021) — 132 wells, median 160 ft
- Moss Beach (94038) — 129 wells, median 114 ft
- San Mateo (94497) — 123 wells, median 124 ft
- Millbrae (94030) — 115 wells, median 58 ft
- Belmont (94002) — 110 wells, median 120 ft
- Burlingame (94010) — 100 wells, median 224 ft
- San Mateo (94402) — 98 wells, median 39 ft
- Pacifica (94044) — 95 wells, median 85 ft
- Brisbane (94005) — 85 wells, median 30 ft
- San Francisco (94128) — 84 wells, median 22 ft
- Daly City (94014) — 76 wells, median 548 ft
- Montara (94037) — 73 wells, median 225 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.