Water quality for ZIP code 94513
ZIP 94513 covers Brentwood, Knightsen, Byron, Antioch, and Discovery Bay in Contra Costa County, California, one of 43 ZIP codes in the 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 |
|---|---|---|---|---|
| Colonia Santa Maria |
32 | 2 | 1.8 mi | |
| Brentwood Brentwood |
64,513 | 0 | 2.9 mi | |
| Orwood Resort |
350 | 2 | 3.3 mi | |
| Town of Discovery Bay |
16,790 | 0 | 3.5 mi | |
| Camino Mobilehome |
210 | 0 | 3.6 mi | |
| Knightsen Community Water System |
73 | 0 | 3.7 mi | |
| Big Oak Mobile Home Park Water |
156 | 0 | 5.1 mi | |
| Diablo Water District |
47,158 | 0 | 5.1 mi | |
| Oakley Mutual Water Company |
170 | 2 | 5.3 mi | |
| Ccwd/brentwood Wtp |
0 | 0 | 5.4 mi | |
| Randall-Bold Water Treatment Plant |
1 | 0 | 5.4 mi | |
| Delta Mutual Water Company |
333 | 1 | 5.8 mi | |
| Sandy Point Mobile Home Park |
67 | 2 | 6.2 mi | |
| Dutch Slough Water Works |
49 | 1 | 6.2 mi | |
| Willow Park Marina |
380 | 1 | 6.3 mi | |
| Marina Mobile Manor |
75 | 0 | 6.3 mi | |
| Sandmound Mutual |
100 | 2 | 6.5 mi | |
| Farrar Park Property Owners |
140 | 0 | 6.6 mi | |
| Bethel Island Mutual Water CO |
123 | 1 | 6.6 mi | |
| Anglers Subdivision 4 |
99 | 1 | 6.7 mi | |
| Angler S Ranch #3 |
60 | 1 | 6.9 mi | |
| Clayton Palms Water |
549 | 1 | 7.1 mi | |
| Bethel Island Estates |
200 | 0 | 7.4 mi | |
| Pleasantimes Mutual Water CO |
644 | 0 | 7.4 mi | |
| Bethel Island MHC |
185 | 0 | 7.6 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, the county this ZIP code lies in, nearest to the ZIP code's centre 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.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA 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.