Water quality in Oakley, California
Oakley is in Contra Costa County. 84 active public water systems serve the county; 21 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Contra Costa County
38 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Big Oak Mobile Home Park Water |
156 | 0 | 0.4 mi | |
| Knightsen Community Water System |
73 | 0 | 2.1 mi | |
| Dutch Slough Water Works |
49 | 1 | 2.5 mi | |
| Ccwd/brentwood Wtp |
0 | 0 | 2.5 mi | |
| Randall-Bold Water Treatment Plant |
1 | 0 | 2.6 mi | |
| Angler S Ranch #3 |
60 | 1 | 2.7 mi | |
| Anglers Subdivision 4 |
99 | 1 | 2.8 mi | |
| Bethel Island Mutual Water CO |
123 | 1 | 3.2 mi | |
| Farrar Park Property Owners |
140 | 0 | 3.2 mi | |
| Marina Mobile Manor |
75 | 0 | 3.3 mi | |
| Sandmound Mutual |
100 | 2 | 3.5 mi | |
| Willow Park Marina |
380 | 1 | 3.5 mi | |
| Sandy Point Mobile Home Park |
67 | 2 | 3.6 mi | |
| Delta Mutual Water Company |
333 | 1 | 3.6 mi | |
| Oakley Mutual Water Company |
170 | 2 | 3.8 mi | |
| Brentwood Brentwood |
64,513 | 0 | 4.4 mi | |
| Willow Mobile Home Park |
481 | 0 | 4.5 mi | |
| Riverview Water Association |
230 | 1 | 4.6 mi | |
| Bethel Island Estates |
200 | 0 | 4.6 mi | |
| Pleasantimes Mutual Water CO |
644 | 0 | 4.7 mi | |
| Russos Mobile Park |
110 | 2 | 4.7 mi | |
| Bethel Island MHC |
185 | 0 | 4.9 mi | |
| City of Antioch Antioch |
116,781 | 0 | 5.7 mi | |
| Orwood Resort |
350 | 2 | 6.0 mi | |
| Colonia Santa Maria |
32 | 2 | 6.5 mi |
Non-community systems in Contra Costa County (45: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Contra Costa County, nearest to Oakley first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.