MADISON SERVICE DIST

Water Quality Snapshot: MADISON SERVICE DIST

MADISON SERVICE DIST is a local-owned community water system that delivers drinking water to 876 residents in MADISON, California (Yolo County) through 149 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 53 total violations for this system , of which 20 (38%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 27 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 10 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. MADISON SERVICE DIST's 53 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.