County · California
Yolo County, California: drinking water records
This overview covers 18 ZIP codes and 18 community water systems in Yolo 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 |
|---|---|---|---|---|---|
| City of West Sacramento CA5710003 | 53,355 | 90 | 0 | 1 | 0 ppb |
| City of Davis CA5710001 | 67,457 | 540 | 0 | 0 | 0 ppb |
| City of Woodland CA5710006 | 61,462 | 720 | 0 | 0 | 0 ppb |
| Uc - Davis CA5710009 | 49,616 | 450 | 0 | 0 | 0 ppb |
| City of Winters CA5710005 | 7,115 | 300 | 1 | 0 | 0 ppb |
| Knights Landing Svc. Dist. CA5710004 | 944 | 0 | 0 | 1 | 0 ppb |
| Madison Service Dist CA5700571 | 876 | 0 | 0 | 1 | 0 ppb |
| Monroe/Leinberger Cntr - Waters CA5700797 | 800 | 0 | 0 | 1 | 0 ppb |
| North Davis Meadows CA5700788 | 314 | 0 | 0 | 28 | 0 ppb |
| Cacheville Service Dist CA5700700 | 239 | 0 | 0 | 1 | 0 ppb |
| Bonfire Village Hotel CA5700555 | 25 | 0 | 0 | 17 | 0 ppb |
| Esparto C.S.D. CA5710007 | 3,574 | 0 | 0 | 0 | 0 ppb |
| Wild Wings Golf Community CA5710011 | 1,115 | 0 | 0 | 0 | 0 ppb |
| Cal Am - Dunnigan CA5700712 | 602 | 0 | 0 | 0 | 0 ppb |
| Yolo Co Housing Authority-El Rio Villa CA5700615 | 432 | 0 | 0 | 0 | 7 ppb |
| Campers Inn - RV & Golf Course CA5700554 | 140 | 0 | 0 | 0 | 0 ppb |
| Rolling Acres Mutual Water Company CA5700707 | 40 | 0 | 0 | 0 | 0 ppb |
| Woodland-Davis Clean Water Agency CA5710012 | 0 | 0 | 0 | 0 | not reported |
ZIP reports in Yolo 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: 95607, 95612, 95637, 95679, 95698.
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.