County · California
San Benito County, California: drinking water records
This overview covers 4 ZIP codes and 31 community water systems in San Benito County. It also stands in for 1 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 |
|---|---|---|---|---|---|
| Hollister, City of CA3510001 | 26,017 | 660 | 0 | 3 | 2.3 ppb |
| Thousand Trails San Benito Preserve CA3500505 | 1,017 | 120 | 0 | 3 | 10.7 ppb |
| Sunnyslope County Water Dist CA3510003 | 24,954 | 540 | 4 | 0 | 0 ppb |
| San Juan Bautista, City of CA3510002 | 2,335 | 0 | 0 | 4 | 0 ppb |
| Rancho San Joaquin Mwc CA3500581 | 914 | 0 | 0 | 3 | 0 ppb |
| Csa No. 31 Stonegate Ws CA3500006 | 230 | 0 | 0 | 1 | 0 ppb |
| San Justo Mutual Water Company CA3500550 | 160 | 0 | 0 | 1 | 0 ppb |
| Hollister Ranch Estates CA3500904 | 150 | 0 | 0 | 4 | 0 ppb |
| Mission Farm R.V. Park CA3500556 | 110 | 0 | 0 | 1 | 0 ppb |
| Valenzuela Water System CA3500527 | 55 | 0 | 0 | 2 | 0 ppb |
| Betabel RV Resort CA3500836 | 49 | 0 | 0 | 1 | 0 ppb |
| Aromas Hills Mutual Water Association CA3500576 | 33 | 0 | 0 | 1 | 0 ppb |
| Aromas Water District CA3510004 | 2,988 | 0 | 0 | 0 | 1.4 ppb |
| Mission Oaks Mobile Home Park CA3510006 | 550 | 0 | 0 | 0 | 0 ppb |
| Tres Pinos Cwd CA3500509 | 350 | 0 | 0 | 0 | 0 ppb |
| Golden State Water Co - San Juan Oaks CA3510008 | 159 | 0 | 0 | 0 | 0 ppb |
| Rosa Morada Mutual Water Company CA3500549 | 138 | 0 | 0 | 0 | 0 ppb |
| Ashford Highlands Mwc CA3500900 | 132 | 0 | 0 | 0 | 0 ppb |
| Dunneville Estates Csa #50 CA3500910 | 120 | 0 | 0 | 0 | 0 ppb |
| Mcmahon Road Mutual Water Company CA3500510 | 102 | 0 | 0 | 0 | 2.9 ppb |
| Comstock Mutual Water Company CA3500912 | 100 | 0 | 0 | 0 | 0 ppb |
| Union Heights Mwc CA3500825 | 98 | 0 | 0 | 0 | 0 ppb |
| Vineyard Estates Mwc CA3500579 | 90 | 0 | 0 | 0 | 0 ppb |
| Fallon Road Labor Housing CA3500830 | 84 | 0 | 0 | 0 | 6.9 ppb |
| Creekbridge Mutual Water Company CA3500911 | 69 | 0 | 0 | 0 | 45.3 ppb |
ZIP reports in San Benito 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: 95075.
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.