County · California
Trinity County, California: drinking water records
This overview covers 13 ZIP codes and 17 community water systems in Trinity County. It also stands in for 5 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 |
|---|---|---|---|---|---|
| Weaverville C.S.D. CA5310001 | 3,975 | 360 | 2 | 1 | 11.7 ppb |
| Lewiston Community Services District CA5301002 | 677 | 0 | 0 | 1 | 2.7 ppb |
| Trinity Knolls Mutual Water Company CA5301102 | 338 | 0 | 0 | 1 | 1.4 ppb |
| Trinity Village Mutual Water CA5304102 | 332 | 0 | 0 | 1 | 2 ppb |
| Salyer Mutual Wc (Formerly Riverview Ac) CA5304501 | 231 | 0 | 0 | 1 | 0 ppb |
| Salyer Heights W.S., INC CA5304502 | 130 | 0 | 0 | 6 | 0 ppb |
| Burnt Ranch Estates CA5304109 | 115 | 0 | 0 | 2 | 0.6 ppb |
| Covington Mill Mwc-Division B CA5301104 | 99 | 0 | 0 | 1 | 0 ppb |
| Indian Creek Trailer Park CA5303002 | 43 | 0 | 0 | 3 | 0 ppb |
| Bucktail Mutual Water Company CA5301001 | 42 | 0 | 0 | 1 | 5.6 ppb |
| Seymour'S Mutual Water System CA5301201 | 40 | 0 | 0 | 1 | 21.5 ppb |
| Trinity Co. W.W. Dist #1 CA5310002 | 2,324 | 0 | 0 | 0 | 0 ppb |
| Trinity Center M.W.C. CA5310003 | 729 | 0 | 0 | 0 | 1.8 ppb |
| Treasure Creek Woods Mwc CA5301101 | 131 | 0 | 0 | 0 | 0 ppb |
| Rush Creek Mutual Water System CA5301017 | 102 | 0 | 0 | 0 | 0 ppb |
| Covington Mill - a CA5301103 | 60 | 0 | 0 | 0 | 0.6 ppb |
| Minerva MHP, LLC FL3531198 | 45 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Trinity 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: 95552, 95595, 96010, 96046, 96048.
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.