{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/water-quality/21401/","name":"Water quality for ZIP 21401 — Annapolis, MD","description":"Water quality data for ZIP 21401 (Annapolis, 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":"21401","city":"Annapolis","state":"MD","stateFull":"Maryland","county":"Anne Arundel County","countySlug":"anne-arundel-county","geo":{"latitude":38.9784,"longitude":-76.4922}},"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":{"pwsid":"MD0020001","name":"CITY OF ANNAPOLIS","populationServed":35000,"waterSource":"GW","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/21401/","zipDashboardUrl":"https://zipradar.org/zip/21401/","zipDashboardApiUrl":"https://zipradar.org/api/zip/21401/","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/21401/"}}