Water quality in Knightsen, California
Knightsen 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 |
|---|---|---|---|---|
| Knightsen Community Water System |
73 | 0 | 1.3 mi | |
| Oakley Mutual Water Company |
170 | 2 | 2.3 mi | |
| Orwood Resort |
350 | 2 | 2.6 mi | |
| Delta Mutual Water Company |
333 | 1 | 2.8 mi | |
| Sandy Point Mobile Home Park |
67 | 2 | 3.2 mi | |
| Diablo Water District |
47,158 | 0 | 3.3 mi | |
| Willow Park Marina |
380 | 1 | 3.3 mi | |
| Marina Mobile Manor |
75 | 0 | 3.4 mi | |
| Dutch Slough Water Works |
49 | 1 | 3.4 mi | |
| Big Oak Mobile Home Park Water |
156 | 0 | 3.4 mi | |
| Sandmound Mutual |
100 | 2 | 3.5 mi | |
| Farrar Park Property Owners |
140 | 0 | 3.6 mi | |
| Bethel Island Mutual Water CO |
123 | 1 | 3.6 mi | |
| Anglers Subdivision 4 |
99 | 1 | 3.9 mi | |
| Angler S Ranch #3 |
60 | 1 | 4.1 mi | |
| Brentwood Brentwood |
64,513 | 0 | 4.3 mi | |
| Bethel Island Estates |
200 | 0 | 4.4 mi | |
| Town of Discovery Bay |
16,790 | 0 | 4.4 mi | |
| Pleasantimes Mutual Water CO |
644 | 0 | 4.5 mi | |
| Bethel Island MHC |
185 | 0 | 4.6 mi | |
| Colonia Santa Maria |
32 | 2 | 4.7 mi | |
| Ccwd/brentwood Wtp |
0 | 0 | 4.8 mi | |
| Randall-Bold Water Treatment Plant |
1 | 0 | 4.9 mi | |
| Russos Mobile Park |
110 | 2 | 5.1 mi | |
| Riverview Water Association |
230 | 1 | 5.3 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 Knightsen 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.