{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/water-quality/57101/","name":"Water quality for ZIP 57101 — Sioux Falls, SD","description":"Water quality data for ZIP 57101 (Sioux Falls, South Dakota), 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":"57101","city":"Sioux Falls","state":"SD","stateFull":"South Dakota","county":"Minnehaha County","countySlug":"minnehaha-county","geo":{"latitude":43.546,"longitude":-96.7313}},"stateContext":{"topConcern":"Radon Zone 1, agricultural water, tornadoes","narrative":"South Dakota is uniformly Zone 1 radon. Agricultural runoff drives EPA SDWIS nitrate compliance pressure in small rural systems. Tornado risk peaks April-June."},"radonZone":null,"airQuality":null,"waterQuality":{"primary":{"pwsid":"SD4600294","name":"SIOUX FALLS","populationServed":216462,"waterSource":"SW","violations":{"windowYears":3,"total":0,"healthBased":0,"latest":null}},"systemCount":14,"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/57101/","zipDashboardUrl":"https://zipradar.org/zip/57101/","zipDashboardApiUrl":"https://zipradar.org/api/zip/57101/","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/57101/"}}