County · California
San Bernardino County, California: drinking water records
This overview covers 91 ZIP codes and 149 community water systems in San Bernardino 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 |
|---|---|---|---|---|---|
| East Valley Water District CA3610064 | 108,629 | 840 | 7 | 3 | 0 ppb |
| Yucaipa Valley Water District CA3610055 | 52,010 | 933 | 4 | 5 | 0 ppb |
| California Institution for Men CA3610850 | 10,667 | 60 | 0 | 5 | 2.5 ppb |
| Csa 70 W-3 Hacienda CA3600114 | 611 | 120 | 0 | 38 | 0 ppb |
| Bar-Len Mwc CA3600025 | 126 | 60 | 0 | 39 | 0 ppb |
| San Gabriel Valley Wc - Fontana CA3610041 | 237,700 | 770 | 0 | 0 | 0 ppb |
| San Bernardino City CA3610039 | 214,665 | 1,320 | 4 | 0 | 0 ppb |
| Cucamonga Valley Water District CA3610018 | 211,069 | 600 | 0 | 0 | 0 ppb |
| Ontario Municipal Utilities Company CA3610034 | 185,010 | 1,080 | 6 | 0 | 0.6 ppb |
| Victorville Water District CA3610052 | 135,983 | 864 | 0 | 0 | 0 ppb |
| West Valley Water District CA3610004 | 104,498 | 600 | 0 | 0 | 0 ppb |
| Hesperia WD CA3610024 | 100,744 | 900 | 7 | 0 | 0 ppb |
| Chino, City of CA3610012 | 86,435 | 720 | 0 | 0 | 1 ppb |
| Upland, City of CA3610050 | 78,376 | 990 | 3 | 0 | 0 ppb |
| Redlands City Mud-Water Div CA3610037 | 78,025 | 1,140 | 3 | 0 | 2.9 ppb |
| Chino Hills, City of CA3610036 | 76,414 | 180 | 0 | 0 | 0 ppb |
| Liberty Utilities (Av Ranchos) Corp. CA3610003 | 64,469 | 600 | 0 | 0 | 0.6 ppb |
| Monte Vista WD CA3610029 | 56,017 | 747 | 5 | 0 | 0 ppb |
| Rialto, City of CA3610038 | 54,453 | 570 | 7 | 0 | 0 ppb |
| Colton, City of CA3610014 | 46,525 | 446 | 6 | 0 | 0 ppb |
| Adelanto, City of CA3610001 | 39,930 | 118 | 2 | 0 | 0 ppb |
| Golden State Water Co - Barstow CA3610043 | 32,547 | 240 | 4 | 0 | 1.6 ppb |
| Hi Desert WD CA3610073 | 26,411 | 420 | 3 | 0 | 1.7 ppb |
| Big Bear Lake DWP - Big Bear System CA3610044 | 26,132 | 1,200 | 4 | 0 | 0 ppb |
| Loma Linda, City of CA3610013 | 25,129 | 300 | 0 | 0 | 0 ppb |
ZIP reports in San Bernardino 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: 92280, 92301, 92304, 92332, 92347.
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.