CGS Mineral Hazards: Indoor Radon Potential Zones

This digital layer contains polygons (vector format) of portions of California designated as having high, moderate, low, or unknown potential for homes to exceed the U.S. EPA recommended radon action level of 4.0 picocuries per liter in indoor air. Only a portion of California is covered by the studies included in this dataset.
Organization: State of California
Last updated: 2025-07-24T02:07:44.359474
Tags: california, california-department-of-conservation, california-geological-survey, california-geology, california-natural-resources-agency, caopendata, cgs, cnra, doc, geologic-hazards, land-use-planning, mineral-hazards, mineral-resources, minerals, radon