589 active public water systems serve 323,615 people in Waukesha County. 481 are compliant, 108 had at least one EPA violation in the past three years, 2 are designated serious violators, and 3 carry a health flag.
Active systems58973 community systems
People served324Kby public water systems
Systems with violations10818% of active systems, past 3 years
Serious violators23 systems carry a health flag
Needs attention
Pewaukee Village WaterworksWI2680229 · Pewaukee · Community water system · Serves 8,1662 rules violated in the past three years. Unresolved: Public Notice Rule and Revised PN Rule.
Norris INCWI2680246 · Mukwonago · Community water system · Serves 1415 rules violated in the past three years. Unresolved: Ground Water Rule, Lead and Copper Rule, Public Notice Rule and Revised PN Rule, and Consumer Confidence Rule.
Kiltie INCWI2680298 · Oconomowoc · Transient non-community system · Serves 2001 rule violated in the past three years. Unresolved: Ground Water Rule.
Carriage Hills CondominiumsWI2682406 · Elm Grove · Community water system · Serves 504 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions and Public Notice Rule and Revised PN Rule.
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Wisconsin records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.
Compliant
Compliant
No violations reported to EPA in the past three years.
At least one violation on record with EPA in the past three years. Many are monitoring or reporting lapses rather than contamination; the system page lists which rules were involved and whether each is still open.
EPA's designation, also called an enforcement priority, for a system with unresolved serious, multiple, or continuing violations. EPA expects the system and its state to act quickly to resolve them.
At least one open health-based violation: an exceedance of a maximum contaminant level or residual disinfectant level, or a treatment technique violation. Monitoring and reporting lapses do not raise this flag.