{"@context":"https://schema.org","@type":"Dataset","@id":"https://zipradar.org/topic/radon/94920/","name":"Radon for ZIP 94920 — Tiburon (Marin), CA","description":"Radon data for ZIP 94920 (Tiburon (Marin), California), 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":"94920","city":"Tiburon (Marin)","state":"CA","stateFull":"California","county":"Marin County","countySlug":"marin-county","geo":{"latitude":37.8735,"longitude":-122.4574}},"stateContext":{"topConcern":"Wildfire (WUI), seismic, water-supply variability","narrative":"California carries the highest concentrated WUI wildfire risk in the US per USFS WHP, with FAIR Plan + non-renewal pressure intensifying since 2017 fires. FEMA NFHL coverage is strong; drinking-water systems vary from large urban (LADWP, EBMUD) to small disadvantaged community systems flagged in EPA SDWIS. Radon risk is mostly Zone 2-3."},"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/94920/","zipDashboardUrl":"https://zipradar.org/zip/94920/","zipDashboardApiUrl":"https://zipradar.org/api/zip/94920/","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/94920/"}}