MADERA CO SA16 SUMNER HILL

Water Quality Snapshot: MADERA CO SA16 SUMNER HILL

MADERA CO SA16 SUMNER HILL is a local-owned community water system that delivers drinking water to 135 residents in MADERA, California (Madera County) through 43 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 113 total violations for this system , of which 95 (84%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 13 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Total Haloacetic Acids (HAA5), recorded in 51 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

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. MADERA CO SA16 SUMNER HILL's 113 violations sit above the California average. Statewide, 447 of 694 UCMR5-tested systems have reported PFAS detections (64.4%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.