{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/water-quality/52240/","name":"Water quality for ZIP 52240 — Iowa City (IA), IA","description":"Water quality data for ZIP 52240 (Iowa City (IA), Iowa), 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 CWS serving the address, any health-based violations in the last 3 years, most recent lead and copper sampling result, and a link to the primary SDWIS record.","limitations":"Where a ZIP is served by multiple water systems, zipradar shows the dominant CWS by population served and lists alternates. Private well water is not covered."},"place":{"zip":"52240","city":"Iowa City (IA)","state":"IA","stateFull":"Iowa","county":"Johnson County (IA)","countySlug":"johnson-county","geo":{"latitude":41.6611,"longitude":-91.5302}},"stateContext":{"topConcern":"Radon Zone 1, agricultural water nitrates","narrative":"Iowa is one of the highest-radon states in the US — uniformly Zone 1. Agricultural runoff drives EPA SDWIS nitrate violations in small rural systems and even Des Moines Water Works. Tornadoes peak April-June."},"radonZone":null,"airQuality":null,"datePublished":"2026-04-24","dateModified":"2026-09-07","canonicalUrl":"https://zipradar.org/topic/water-quality/52240/","zipDashboardUrl":"https://zipradar.org/zip/52240/","zipDashboardApiUrl":"https://zipradar.org/api/zip/52240/","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/52240/"}}