{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/water-quality/55811/","name":"Water quality for ZIP 55811 — Duluth, MN","description":"Water quality data for ZIP 55811 (Duluth, Minnesota), 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":"55811","city":"Duluth","state":"MN","stateFull":"Minnesota","county":"St. Louis County (MN)","countySlug":"st-louis-county","geo":{"latitude":46.7867,"longitude":-92.1005}},"stateContext":{"topConcern":"Radon Zone 1, lead in older Twin Cities housing","narrative":"Minnesota is uniformly Zone 1 radon. Twin Cities + Duluth carry LCRR lead-service-line obligations. Spring snowmelt flooding affects FEMA AE zones along the Red River + Minnesota River."},"radonZone":null,"airQuality":null,"waterQuality":{"primary":{"pwsid":"MN1690011","name":"Duluth","populationServed":86859,"waterSource":"SW","violations":{"windowYears":3,"total":0,"healthBased":0,"latest":null}},"systemCount":1,"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/55811/","zipDashboardUrl":"https://zipradar.org/zip/55811/","zipDashboardApiUrl":"https://zipradar.org/api/zip/55811/","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/55811/"}}