{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/water-quality/60302/","name":"Water quality for ZIP 60302 — Oak Park, IL","description":"Water quality data for ZIP 60302 (Oak Park, Illinois), 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":"60302","city":"Oak Park","state":"IL","stateFull":"Illinois","county":"Cook County","countySlug":"cook-county","geo":{"latitude":41.8851,"longitude":-87.7845}},"stateContext":{"topConcern":"Lead service lines, flooding (Mississippi/Illinois)","narrative":"Illinois has the highest LCRR lead-service-line replacement obligations in the US (Chicago alone >400,000 LSLs). FEMA AE coverage extends along the Mississippi, Illinois, and Rock rivers. EPA SDWIS shows urban vs. downstate disparity."},"radonZone":null,"airQuality":null,"waterQuality":{"primary":{"pwsid":"IL0310510","name":"CICERO","populationServed":83000,"waterSource":"SW","violations":{"windowYears":3,"total":5,"healthBased":1,"latest":{"date":"2026-01-01","healthBased":false,"category":"MR","contaminant":"5000"}}},"systemCount":133,"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/60302/","zipDashboardUrl":"https://zipradar.org/zip/60302/","zipDashboardApiUrl":"https://zipradar.org/api/zip/60302/","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/60302/"}}