EPA public water records · 06081
San Mateo County, California
Find listed community water systems and their documented follow-up in federal fiscal 2026Q3.
- Systems with linked histories
- 13
- Systems with unresolved health-based records
- 1
- Of those, systems with a formally addressed health-based record
- 1
These counts cover the linked records shown here. A county listing can cover only part of the county or reflect a mailing location.
Find your water system
- BIANCHI FLOWERS INCCA4100583 · California · 1 violation records · 0 unresolved health-based in this snapshot
- BUTANO CANYON MUTUALCA4100503 · California · 5 violation records · 0 unresolved health-based in this snapshot
- CAMP LOMA MARCA4100529 · California · 2 violation records · 0 unresolved health-based in this snapshot
- CITY OF MILLBRAECA4110018 · California · 1 violation records · 0 unresolved health-based in this snapshot
- COUNTY SERVICE AREA 7CA4100509 · California · 2 violation records · 0 unresolved health-based in this snapshot
- CUESTA LA HONDA GUILD INCCA4110012 · California · 34 violation records · 0 unresolved health-based in this snapshot
- ESTERO MUNICIPAL IMPROVEMENT DISTRICTCA4110021 · California · 1 violation records · 0 unresolved health-based in this snapshot
- MARCHI CENTRAL FARMCA4100551 · California · 5 violation records · 0 unresolved health-based in this snapshot
- OKU INCORPORATEDCA4100540 · California · 41 violation records · 0 unresolved health-based in this snapshot
- PALO ALTO PARK MUTUAL WATER COMPANYCA4110020 · California · 1 violation records · 0 unresolved health-based in this snapshot
- PORTOLA IMPROVEMENT ASSOCIATION MWCCA4100555 · California · 1 violation records · 0 unresolved health-based in this snapshot
- PUENTE HOUSING SOLUTIONSCA4100610 · California · 1 violation records · 1 unresolved health-based in this snapshot
- REDWOOD TERRACE MUTUALCA4100510 · California · 2 violation records · 0 unresolved health-based in this snapshot
EPA data and scope
How to read the records
The enforcement snapshot is federal fiscal 2026Q3. The EPA archive labels its violation file October 13, 2026. EPA says federal reporting can lag by several months. For current advisories, check your utility or local drinking-water authority.
- We matched active community water systems by public water system ID between EPA’s system search and SDWIS inventory. We show violations with a recorded noncompliance, initial reporting or return-to-compliance date from 2021 onward, plus earlier records listed as Addressed or Unaddressed.
- EPA’s health-based flag identifies violations of contaminant or disinfectant limits or treatment requirements. Monitoring and reporting violations describe required tests or reports. Neither category measures household exposure.
- Addressed means EPA records formal enforcement on a violation that remains unresolved in the snapshot. Unaddressed means no formal action is recorded for an unresolved violation. Resolved can mean compliance was restored, the rule ceased to apply, or further action was unnecessary. Archived is a separate status.
- We count a violation once per water system and group its distinct linked actions. Conflicting records are set aside. Places are EPA-listed search locations and can include mailing locations. Use the provider name and system ID to identify your service.
EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility