Rockland County, NY: EPA's radon zone, explained

EPA's own radon map rates Rockland County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rockland County sits at the 31st percentile nationally for radon potential — above 31 of every 100 rated counties.

Where Rockland County sits nationally

Rockland County, New York is home to about 348,144 people across 173.685 square miles. Averaged across its land area, Rockland County runs about 2,004 people per square mile. By population, Rockland County is the 77th largest of every county sharing its EPA zone — the 93rd percentile by population within that zone. Rockland County falls in EPA Radon Region 2, one of 83 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Rockland County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Even at Zone 3, Rockland County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Next steps for a home in Rockland County

For a Rockland County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find New York's state radon program

For Rockland County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Rockland County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Rockland County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.