EPA Radon Mitigation Standards (April 1994)

This document is provided only for historical, archival purposes. EPA recommends the ASTM E2121-09 Standard Practice for Radon Mitigation Systems in Existing Low-Rise Residential Buildings for residential radon mitigation. The Agency initially recognized this standard in 2003 as the most appropriate guide to reducing radon in homes as far as practicable below the national action level of 4 pCi/L in indoor air.