{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/water-quality/20850/","name":"Water quality for ZIP 20850 — Rockville, MD","description":"Water quality data for ZIP 20850 (Rockville, Maryland), 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":"20850","city":"Rockville","state":"MD","stateFull":"Maryland","county":"Montgomery County (MD)","countySlug":"montgomery-county","geo":{"latitude":39.084,"longitude":-77.1528}},"stateContext":{"topConcern":"Chesapeake flood, lead pipes","narrative":"Maryland has dense FEMA NFHL coverage along Chesapeake Bay tributaries. Baltimore City has extensive LCRR lead-service-line obligations and flagged EPA SDWIS compliance history. Radon Zone 1-2 across most counties."},"radonZone":null,"airQuality":null,"waterQuality":{"primary":null,"systemCount":0,"note":"zipradar has no EPA water-system record for this ZIP yet. That is a gap in our records, not a sign that the water is untested. Your water utility's annual water quality report (Consumer Confidence Report) has the results; if the home is on a private well, the owner or the county health department is the place to ask.","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/20850/","zipDashboardUrl":"https://zipradar.org/zip/20850/","zipDashboardApiUrl":"https://zipradar.org/api/zip/20850/","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/20850/"}}