County · California
Riverside County, California: drinking water records
This overview covers 71 ZIP codes and 110 community water systems in Riverside County. It also stands in for 0 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 |
|---|---|---|---|---|---|
| Lake Hemet MWD CA3310022 | 52,913 | 570 | 0 | 1 | 0 ppb |
| Norco, City of CA3310025 | 25,068 | 420 | 7 | 1 | 0 ppb |
| Nuevo Water Company CA3310026 | 6,733 | 120 | 5 | 5 | 2.9 ppb |
| Eastern Municipal WD CA3310009 | 666,581 | 1,030 | 0 | 0 | 2.8 ppb |
| Riverside, City of CA3310031 | 298,398 | 120 | 3 | 0 | 1 ppb |
| Coachella Vwd: Cove Community CA3310001 | 270,000 | 1,200 | 0 | 0 | 0 ppb |
| Elsinore Valley MWD CA3310012 | 169,455 | 656 | 1 | 0 | 1.3 ppb |
| Corona, City of CA3310037 | 168,575 | 1,620 | 4 | 0 | 3.7 ppb |
| Rancho California Water District CA3310038 | 146,147 | 2,311 | 8 | 0 | 0 ppb |
| Jurupa Community Sd CA3310021 | 135,093 | 540 | 0 | 0 | 0 ppb |
| Western MWD CA3310049 | 86,062 | 360 | 3 | 0 | 1.3 ppb |
| Indio Water Authority CA3310020 | 84,757 | 780 | 0 | 0 | 0 ppb |
| Desert Water Agency CA3310005 | 74,807 | 660 | 0 | 0 | 0 ppb |
| Beaumont Cherry Valley WD CA3310002 | 66,841 | 600 | 0 | 0 | 7.8 ppb |
| Coachella Water Authority CA3310007 | 43,590 | 330 | 0 | 0 | 0 ppb |
| Mission Springs WD CA3310008 | 43,484 | 420 | 0 | 0 | 0 ppb |
| Rubidoux Community Sd CA3310044 | 36,827 | 120 | 3 | 0 | 1.6 ppb |
| Hemet, City of CA3310016 | 33,828 | 180 | 0 | 0 | 0 ppb |
| Banning, City of CA3310006 | 31,680 | 720 | 1 | 0 | 0 ppb |
| Temescal Valley Water District CA3310074 | 21,971 | 120 | 0 | 0 | 0 ppb |
| San Jacinto, City of CA3310032 | 18,950 | 180 | 0 | 0 | 1.2 ppb |
| Western MWD - Murrieta Division CA3310036 | 17,453 | 240 | 3 | 0 | 1.5 ppb |
| South Mesa Wc CA3310017 | 10,108 | 480 | 4 | 0 | 0 ppb |
| Blythe - City of CA3310003 | 9,798 | 180 | 0 | 0 | 5.5 ppb |
| Myoma Dunes Mutual Water Company CA3310051 | 9,445 | 300 | 0 | 0 | 0 ppb |
ZIP reports in Riverside County
No ZIP report in this county is published yet.
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.