Original compiled datasets and reference resources built from primary government sources. All files are freely downloadable with stated vintages, methods and limitations. This section publishes data context — it does not perform radon testing or mitigation.
EPA DATA · VERIFIED 2026-07-24
All 3,144 county and county-equivalent radon-potential records from EPA's September 2025 source file. Includes state summaries, an Iowa extract, a 2025 Census geography crosswalk audit, verified measured-data sources and nine freely downloadable files.
STANDARDS CROSSWALK · VERIFIED 2026-07-24
Ten labeled SVG diagrams paired with a 22-component specification crosswalk, a four-authority exhaust-clearance comparison (SGM-SF-2023 vs. CCAH vs. IRC vs. EPA), Iowa's 2026 Chapter 44 before-and-after table, and downloadable CSV/JSON datasets.
Cedar Rapids Radon Mitigation Research is the independent research and reference section of this website. It publishes original compilations of public data with sources, vintages, methods and limitations stated. It collects no radon measurements of its own.