Pewaukee City Water and Sewer Utility

Water Quality Snapshot: Pewaukee City Water and Sewer Utility

Pewaukee City Water and Sewer Utility is a local-owned community water system that delivers drinking water to 8,671 residents in Pewaukee, Wisconsin (Waukesha County) through 3,211 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 467 total violations for this system , of which 222 (48%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 224 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 Gross Alpha, Excl. Radon and U, recorded in 117 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 10 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 69 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Wisconsin, EPA tracks 10,988 public water systems serving 5,131,439 people, with 285,161 cumulative violations and 58,688 health-based violations on record. About 72% of systems in the state carry at least one violation, and state-wide the average per system is 26 violations. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%).

Pewaukee City Water and Sewer Utility's 467 violations sit above the Wisconsin average.

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