EPA radon zone by county

EPA Map of Radon Zones county zone 1, 2, or 3 for a US point or state and county. For testing or disclosure follow-up: Zone 1 carries a radon overhang watch item. County potential, not a building reading, health claim, or property safety finding. Use this when you can call Locus free tools (REST tools/call or MCP). Use locus-radon-zone instead when your client can only call paid x402 routes; it returns the same records. Direct flat-body route for this one free resource; no API key, payment, or catalog wrapper. Return only the cited bounded evidence described here; this route never produces a paid brief or full report.

post/api/locus_radon_zone

Request

Base URL: https://api.locus.report
URL: https://api.locus.report/api/locus_radon_zone
Auth: none required

Request body

addressstring

Optional US street address; used to derive county when state+county or lat/lng are not provided.

latitudenumber

Optional decimal latitude; provide with longitude to derive county from the point.

longitudenumber

Optional decimal longitude; provide with latitude to derive county from the point.

statestring

Optional two-letter state code; provide with county to skip point resolution.

countystring

Optional county name, e.g. Wake County; provide with state to skip point resolution.

Response

Free cited evidence response.

object required

Changes

No recorded changes to this operation across all 1 revision of this API.