{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/radon/29403/","name":"Radon for ZIP 29403 — North Charleston (SC), SC","description":"Radon data for ZIP 29403 (North Charleston (SC), South Carolina), 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":"29403","city":"North Charleston (SC)","state":"SC","stateFull":"South Carolina","county":"Charleston County","countySlug":"charleston-county","geo":{"latitude":32.8546,"longitude":-79.9748}},"stateContext":{"topConcern":"Hurricanes (coastal), inland flood","narrative":"South Carolina's coastline (Hilton Head, Charleston, Myrtle Beach) carries dense FEMA VE/AE zones. Inland AE zones along the Pee Dee, Santee, Saluda rivers. EPA SDWIS small-system compliance variability."},"radonZone":{"zone":3,"label":"Zone 3 — lowest potential","potential":"predicted average indoor radon screening level less than 2 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,"datePublished":"2026-04-24","dateModified":"2026-09-07","canonicalUrl":"https://zipradar.org/topic/radon/29403/","zipDashboardUrl":"https://zipradar.org/zip/29403/","zipDashboardApiUrl":"https://zipradar.org/api/zip/29403/","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/29403/"}}