{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/water-quality/53703/","name":"Water quality for ZIP 53703 — Madison, WI","description":"Water quality data for ZIP 53703 (Madison, Wisconsin), sourced from EPA SDWIS.","topic":{"slug":"water-quality","label":"Water quality","source":"EPA SDWIS","sourceUrl":"https://www.epa.gov/ground-water-and-drinking-water/safe-drinking-water-information-system-sdwis-federal-reporting","refreshCadence":"Quarterly (federal mandate)","summary":"Pages show the largest community water system on record for the ZIP's county, its PWSID and population served, and its health-based and total violations in the last 3 years. Lead and copper sampling results are not shown; your utility's annual water quality report (CCR) has them.","limitations":"Where a county has several water systems, zipradar shows the one serving the most people and says how many others are on record; yours may be a different one. Private well water is not covered."},"place":{"zip":"53703","city":"Madison","state":"WI","stateFull":"Wisconsin","county":"Dane County","countySlug":"dane-county","geo":{"latitude":43.0731,"longitude":-89.4012}},"stateContext":{"topConcern":"Lead pipes (Milwaukee), radon Zone 1","narrative":"Wisconsin is uniformly Zone 1 radon. LCRR lead-service-line obligations heaviest in Milwaukee, Madison, Green Bay. Lake Michigan shoreline erosion expands FEMA AE zones in some lakefront counties."},"radonZone":null,"airQuality":null,"waterQuality":{"primary":{"pwsid":"WI1130224","name":"MADISON WATER UTILITY","populationServed":272000,"waterSource":"GW","violations":{"windowYears":3,"total":2,"healthBased":1,"latest":{"date":"2024-10-17","healthBased":true,"category":"TT","contaminant":"5200"}}},"systemCount":46,"caveat":"This is federal SDWIS reporting data for the community water system serving this county, not an address-level test result. Private well water is never covered by SDWIS. Where a county is served by multiple systems, this shows the one serving the most people."},"datePublished":"2026-04-24","dateModified":"2026-09-24","canonicalUrl":"https://zipradar.org/topic/water-quality/53703/","zipDashboardUrl":"https://zipradar.org/zip/53703/","zipDashboardApiUrl":"https://zipradar.org/api/zip/53703/","primarySourceUrl":"https://www.epa.gov/ground-water-and-drinking-water/safe-drinking-water-information-system-sdwis-federal-reporting","license":{"content":"CC-BY-4.0","attribution":"zipradar.org — https://zipradar.org/topic/water-quality/53703/"}}