{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/water-quality/59101/","name":"Water quality for ZIP 59101 — Billings, MT","description":"Water quality data for ZIP 59101 (Billings, Montana), 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":"59101","city":"Billings","state":"MT","stateFull":"Montana","county":"Yellowstone County","countySlug":"yellowstone-county","geo":{"latitude":45.7833,"longitude":-108.5007}},"stateContext":{"topConcern":"Radon Zone 1, wildfire","narrative":"Montana is uniformly Zone 1 radon. Wildfire risk concentrates in the western mountains; the 2017 + 2021 + 2024 seasons all set records. EPA SDWIS shows compliance disparity between Helena/Missoula/Billings and small rural systems."},"radonZone":null,"airQuality":null,"waterQuality":{"primary":{"pwsid":"MT0000153","name":"BILLINGS  CITY OF","populationServed":114000,"waterSource":"SW","violations":{"windowYears":3,"total":0,"healthBased":0,"latest":null}},"systemCount":54,"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/59101/","zipDashboardUrl":"https://zipradar.org/zip/59101/","zipDashboardApiUrl":"https://zipradar.org/api/zip/59101/","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/59101/"}}