Radon

State-by-State Radon Testing Compliance & Lender Guidance Downloadable Interactive Map: Download and save to use interactive features. Then, for more info, hover over states and definitions.

Partner provides this guide of which regulated and non-regulated states have oversight into Radon Testing to help you better understand each state’s oversight. [Download Full Document Here] (Updated June 2025)

In March 2025, the Federal Housing Finance Agency (FHFA) rescinded its 2022 directive that had imposed standardized radon testing requirements on all multifamily properties financed through Fannie Mae and Freddie Mac. The new radon policy was effective immediately; however, the agency guidance documents would be updated at a later date.

State and Local Regulations Will Continue to Drive Fannie Mae and Freddie Mac Radon Testing Practices By Pamela Horne, Environmental Technical Director of Agency Services, and Shavaun Cotter, Technical Director, […]