Purissima Hills Water District

Water Quality Snapshot: Purissima Hills Water District

Purissima Hills Water District is a local-owned community water system that delivers drinking water to 6,245 residents in Los Altos Hills, California (Santa Clara County) through 2,146 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 17 total violations for this system , of which 12 (71%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 2 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 8 violations (TT, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across California, EPA tracks 7,249 public water systems serving 42,404,883 people, with 153,308 cumulative violations and 63,983 health-based violations on record. About 89% of systems in the state carry at least one violation, and state-wide the average per system is 21.1 violations. Statewide, 447 of 694 UCMR5-tested systems have reported PFAS detections (64.4%).

Purissima Hills Water District's 17 violations sit below the California average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.