Radon Pros in New York

Last updated: March 2026

New York's radon risk varies dramatically across the state. The southeastern region — including the Hudson Valley, Westchester County, and Rockland County — sits on the Reading Prong geological formation, a uranium-rich belt that produces some of the highest indoor radon levels in the northeastern United States. These areas are EPA Zone 1. New York City and Long Island are generally Zone 2 to Zone 3, with lower average levels, though ground-floor and basement units can still test above 4.0 pCi/L. Upstate New York varies by county, with the Finger Lakes region and parts of the Southern Tier showing elevated readings. New York requires radon testers to be certified by the Department of Health, and mitigators should hold NRPP or NRSB credentials. In real estate transactions, radon testing is not state-mandated but is common practice in the Hudson Valley and upstate markets. New York's radon profile is distinctive because of the extreme variation within short distances — homes in the Hudson Valley can test above 20 pCi/L while properties in Manhattan typically test below 1.0 pCi/L. The EPA recommends all New York homes with ground contact be tested regardless of perceived regional risk.