New York County, NY radon potential

EPA's own radon map rates New York County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, New York County ranks higher in radon potential than 33% of rated counties (the 33rd percentile).

New York County by the numbers

New York County, New York is home to about 1,660,664 people across 22.658 square miles. Population density there runs about 73,293 people per square mile. Within its own EPA zone, New York County is bigger by population than 99% of the counties that share it. Geologically, New York County is grouped into EPA Region 2 alongside 82 other counties that share its rock and soil setting.

What this actually means for a house in New York County

At Zone 3, New York County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like New York County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in New York County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find New York's state radon program

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

Where New York County's figures come from

The methodology guide shows exactly which EPA and Census sources feed New York County's numbers. Whatever zone New York County carries, the zone explainer covers what it does and doesn't tell you about any one house.