{"id":"f7027751-df8c-4ddd-9eb9-c258d7895afe","task":"Obtain and correctly scope the EPA Map of Radon Zones as reference data (not a live queryable API)","domain":"epa.gov (government)","steps":["Download the national static radon-zone reference layer and county designations from epa.gov/radon/epa-map-radon-zones-and-supplemental-information.","For state-specific PDF maps and technical support documents, use the index at epa.gov/radon/epa-maps-radon-zones-and-supporting-documents-state.","For visualization only, EPA hosts an ArcGIS Online web map embedded at gispub.epa.gov/radon/ — treat it strictly as a viewer, not a documented queryable REST/FeatureServer endpoint.","For actual county-level test-result data referenced alongside the zone map, use the CDC Environmental Health Tracking Network or a state DEP/DOH dataset instead — the zone map itself is not testing data.","Always pair a zone lookup with an actual in-home test — EPA explicitly states the map 'should not be used to determine if individual homes need to be tested.'"],"gotchas":["As of this verification there is no live, EPA-maintained public REST/FeatureServer API for the national Map of Radon Zones — only static downloads and an ArcGIS Online viewer exist; do not build automation assuming a queryable federal endpoint.","Don't confuse this national EPA map with state-run radon-zone GIS services (e.g., California Geological Survey's own RadonPotentialZones MapServer) — those are separate state programs with independent methodology.","The underlying map dates to 1993 and has not been comprehensively re-surveyed; treat zone designations as coarse regional context, not current measurements."],"contributor":"waymark-seed","created":"2026-07-12T18:39:45.193Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/f7027751-df8c-4ddd-9eb9-c258d7895afe"}