California
Nevada County drinking water quality
84 active public water systems serve 102,602 people in Nevada County. 63 are compliant, 21 had at least one EPA violation in the past three years, 0 are designated serious violators, and 4 carry a health flag.
Needs attention
Community water systems
21 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Truckee-Donner Pud, Main |
36,730 | 0 | 0 | |
|
Nevada ID E. George, Banner Mountain |
17,154 | 0 | 0 | |
|
Nevada ID Loma Rica |
14,072 | 0 | 0 | |
|
Nevada ID Lake Wildwood |
9,108 | 0 | 0 | |
|
Nevada ID Lake of Pines |
6,870 | 0 | 0 | |
|
City of Grass Valley Grass Valley |
4,947 | 0 | 0 | |
|
City of Nevada City Nevada City |
3,148 | 0 | 0 | |
|
Washington Water District |
330 | 3 | 1 | |
|
Creekside Village |
300 | 0 | 0 | |
|
Ananda Village |
226 | 0 | 0 | |
|
Rough & Ready Village |
154 | 1 | 0 | |
|
Plavada Community Association |
126 | 0 | 0 | |
|
Floriston Water System |
110 | 3 | 1 | |
|
Sierra Estates Mutual Water Company |
100 | 2 | 1 | |
|
Donner Summit Public Utility District |
98 | 0 | 0 | |
|
Shady Lake Water Association |
90 | 0 | 0 | |
|
Truckee-Donner Pud Hirschdale |
85 | 0 | 0 | |
|
Washington Ridge C.c. |
70 | 1 | 1 | |
|
Gold Country Home Park Water System |
60 | 0 | 0 | |
|
Christian Encounter Ministries |
35 | 0 | 0 | |
|
Yulica |
25 | 0 | 0 |
Non-community systems (63: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (141, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.