{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/water-quality/19801/","name":"Water quality for ZIP 19801 — Wilmington (DE), DE","description":"Water quality data for ZIP 19801 (Wilmington (DE), Delaware), 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":"19801","city":"Wilmington (DE)","state":"DE","stateFull":"Delaware","county":"New Castle County","countySlug":"new-castle-county","geo":{"latitude":39.7459,"longitude":-75.5466}},"stateContext":{"topConcern":"Sea-level rise, agricultural runoff","narrative":"Delaware has the lowest mean elevation of any US state and FEMA NFHL coverage extends well inland in Sussex County. Agricultural runoff in poultry-heavy regions affects EPA SDWIS small-system nitrate readings. Lead-service-line inventories statewide are nearing 2024 LCRR baseline."},"radonZone":null,"airQuality":null,"waterQuality":{"primary":{"pwsid":"DE0000552","name":"ARTESIAN WATER COMPANY","populationServed":231114,"waterSource":"SW","violations":{"windowYears":3,"total":0,"healthBased":0,"latest":null}},"systemCount":30,"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/19801/","zipDashboardUrl":"https://zipradar.org/zip/19801/","zipDashboardApiUrl":"https://zipradar.org/api/zip/19801/","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/19801/"}}