County · California
Lassen County, California: drinking water records
This overview covers 16 ZIP codes and 19 community water systems in Lassen County. It also stands in for 11 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| City of Susanville CA1810001 | 7,811 | 300 | 0 | 0 | 0 ppb |
| Cdcr-High Desert State Prison CA1805004 | 3,857 | 120 | 0 | 0 | 0 ppb |
| Wisemans Mobile Court OR4100431 | 114 | 0 | 0 | 1 | 0 ppb |
| Lakeside Mobile Home & RV Park OR4100450 | 110 | 0 | 0 | 1 | 1.3 ppb |
| Pineview Mobile Home Park CA1800523 | 80 | 0 | 0 | 1 | 0 ppb |
| Little Valley CSD CA1800516 | 70 | 0 | 0 | 1 | 0 ppb |
| Herlong Public Utility District CA1805007 | 2,114 | 0 | 0 | 0 | 1 ppb |
| Westwood C.S.D. CA1810002 | 1,662 | 0 | 0 | 0 | 0.9 ppb |
| Leavitt Lake CSD CA1810004 | 950 | 0 | 0 | 0 | 0 ppb |
| Lake Forest Mutual W.C. CA1800511 | 565 | 0 | 0 | 0 | 0 ppb |
| Lassen County Water Works District #1 CA1810003 | 450 | 0 | 0 | 0 | 0 ppb |
| Clear Creek Csd-Westwood CA1800512 | 400 | 0 | 0 | 0 | 2.9 ppb |
| Forest Glen Estates MHP GA0350004 | 367 | 0 | 0 | 0 | 5.1 ppb |
| Spaulding Eagle Lake Mwc CA1800534 | 317 | 0 | 0 | 0 | 0 ppb |
| Susan Hills Estates Wc CA1800529 | 252 | 0 | 0 | 0 | 0 ppb |
| Susanville Upper Rancheria 090605150 | 190 | 0 | 0 | 0 | 0.6 ppb |
| Susan River Park Water Co. CA1800503 | 140 | 0 | 0 | 0 | 0 ppb |
| Springbrook Mh S/D NC0118294 | 56 | 0 | 0 | 0 | 0 ppb |
| Honey Lake Campground CA1800522 | 25 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Lassen County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 96006, 96068, 96109, 96114, 96117, 96119, 96121, 96123, 96128, 96132, 96136.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.