California Well Data › Contra Costa County
Contra Costa County, California: well depth, water level & drilling cost
✓ 11,327 DWR records · verified 2026-10-02
Pull every recorded well near a Contra Costa County address — $49
How deep are wells in Contra Costa County, California?
The median drilled well depth in Contra Costa County is 140 ft, based on 6,386 wells with recorded depths in the state DWR database. Half of all wells fall between 60 ft and 240 ft; 90% are shallower than 320 ft. Wells drilled since 2016 have a median depth of 150 ft.
How much does it cost to drill a well in Contra Costa 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 Contra Costa County?
The median static water level is 30 ft below ground surface (middle half of wells: 16 ft–48 ft), from 2,508 measurements.
How much water do wells in Contra Costa County produce?
The median tested yield is 20 gpm (middle half: 6 gpm–40 gpm), from 1,333 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in Contra Costa County?
Companies by number of wells completed in this county since 2016, per filed well completion reports (California Department of Water Resources).
See every driller with wells on record in Contra Costa County, ranked →
Get quotes from local drillers
See every recorded well near any address — depths, water levels, yields, original driller's logs — in a one-time report.
Free lookup Property report — $49Free. Goes to licensed drillers working Contra Costa County.
Well records by ZIP code in Contra Costa County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Antioch (94509) — 714 wells, median 80 ft
- Brentwood (94513) — 688 wells, median 152 ft
- Martinez (94553) — 592 wells, median 175 ft
- Knightsen (94548) — 576 wells, median 180 ft
- Oakley (94561) — 576 wells, median 152 ft
- Richmond (94801) — 510 wells, median 21 ft
- Pittsburg (94565) — 478 wells, median 105 ft
- Discovery Bay (94505) — 410 wells, median 240 ft
- Pleasant Hill (94523) — 343 wells, median 51 ft
- Alamo (94507) — 325 wells, median 200 ft
- Concord (94520) — 325 wells, median 70 ft
- Antioch (94531) — 250 wells, median 139 ft
- Byron (94514) — 212 wells, median 160 ft
- Bethel Island (94511) — 206 wells, median 270 ft
- Walnut Creek (94598) — 185 wells, median 129 ft
- San Pablo (94806) — 164 wells, median 59 ft
- Walnut Creek (94596) — 162 wells, median 57 ft
- Richmond (94802) — 147 wells, median 16 ft
- Clayton (94517) — 142 wells, median 200 ft
- San Ramon (94582) — 140 wells, median 160 ft
- Walnut Creek (94597) — 133 wells, median 65 ft
- Danville (94506) — 130 wells, median 150 ft
- Concord (94519) — 124 wells, median 152 ft
- Diablo (94528) — 123 wells, median 220 ft
- Richmond (94805) — 118 wells, median 16 ft
- Orinda (94563) — 114 wells, median 178 ft
- Lafayette (94549) — 108 wells, median 200 ft
- Concord (94518) — 103 wells, median 51 ft
- Pinole (94564) — 100 wells, median 6 ft
- Danville (94526) — 95 wells, median 125 ft
- Concord (94521) — 94 wells, median 55 ft
- Richmond (94804) — 85 wells, median 13 ft
- Rodeo (94572) — 79 wells, median 27 ft
- Moraga (94570) — 77 wells, median 105 ft
- Concord (94527) — 77 wells, median 150 ft
- Walnut Creek (94595) — 71 wells, median 200 ft
- Moraga (94556) — 69 wells, median 173 ft
- El Cerrito (94530) — 67 wells, median 20 ft
- Concord (94522) — 64 wells, median 60 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.