{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/radon/49503/","name":"Radon for ZIP 49503 — Grand Rapids, MI","description":"Radon data for ZIP 49503 (Grand Rapids, Michigan), sourced from EPA Radon Zones.","topic":{"slug":"radon","label":"Radon","source":"EPA Radon Zones","sourceUrl":"https://www.epa.gov/radon/find-information-about-local-radon-zones-and-state-contact-information","refreshCadence":"Static 1993 baseline plus state-level supplementary updates","summary":"Pages show the county zone, what the classification means for home testing recommendations, and state-level supplementary data where available.","limitations":"Radon is a regional indicator. Address-level radon measurement requires an at-home test kit (often free from state health departments)."},"place":{"zip":"49503","city":"Grand Rapids","state":"MI","stateFull":"Michigan","county":"Kent County (MI)","countySlug":"kent-county","geo":{"latitude":42.9634,"longitude":-85.6681}},"stateContext":{"topConcern":"Lead pipes (post-Flint), Great Lakes erosion","narrative":"Michigan's LCRR obligations are among the heaviest in the US — Detroit, Flint, Benton Harbor, Lansing all carry significant lead-service-line replacement commitments. Great Lakes shoreline erosion expands FEMA AE zones in some lakefront counties."},"radonZone":{"zone":2,"label":"Zone 2 — moderate potential","potential":"predicted average indoor radon screening level between 2 and 4 pCi/L","classification":"county-level, 1993 EPA baseline — not an address-level measurement","caveat":"The Map of Radon Zones should not be used to determine if individual homes need to be tested. No matter where you live, test your home for radon — it's easy and inexpensive."},"airQuality":null,"waterQuality":null,"datePublished":"2026-04-24","dateModified":"2026-09-24","canonicalUrl":"https://zipradar.org/topic/radon/49503/","zipDashboardUrl":"https://zipradar.org/zip/49503/","zipDashboardApiUrl":"https://zipradar.org/api/zip/49503/","primarySourceUrl":"https://www.epa.gov/radon/find-information-about-local-radon-zones-and-state-contact-information","license":{"content":"CC-BY-4.0","attribution":"zipradar.org — https://zipradar.org/topic/radon/49503/"}}