California
Lassen County drinking water quality
56 active public water systems serve 23,250 people in Lassen County. 46 are compliant, 10 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
15 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
City of Susanville Susanville |
7,811 | 0 | 0 | |
|
Cdcr-High Desert State Prison |
3,857 | 0 | 0 | |
|
Westwood C.s.d. |
1,662 | 0 | 0 | |
|
Leavitt Lake Csd |
950 | 0 | 0 | |
|
Herlong Public Utility District |
831 | 0 | 0 | |
|
Lake Forest Mutual W.c. |
565 | 0 | 0 | |
|
Lassen County Water Works District #1 |
450 | 1 | 1 | |
|
Clear Creek Csd-Westwood |
400 | 0 | 0 | |
|
Susan Hills Estates WC |
252 | 0 | 0 | |
|
Susan River Park Water Co. |
140 | 0 | 0 | |
|
Pineview Mobile Home Park |
80 | 2 | 1 | |
|
Little Valley Csd |
70 | 2 | 1 | |
|
Lassen Mobile Home Park |
62 | 0 | 0 | |
|
Spaulding Eagle Lake Mwc |
36 | 0 | 0 | |
|
Honey Lake Campground |
25 | 0 | 0 |
Non-community systems (41: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (96, 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. Retrieved from ECHO on Oct 11, 2026.