Cheshire County, NH radon potential

EPA's own radon map rates Cheshire County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 58th percentile for radon potential — Cheshire County outranks 58% of every county EPA has rated.

Cheshire County by the numbers

Cheshire County, New Hampshire is home to about 78,078 people across 706.725 square miles. That works out to roughly 110 people per square mile. Within its own EPA zone, Cheshire County is bigger by population than 76% of the counties that share it. Cheshire County falls in EPA Radon Region 1, one of 59 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Cheshire County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Nothing about a Zone 2 label lowers the case for testing in Cheshire County — EPA recommends it in every zone, moderate included.

If Cheshire County tests above the action level

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 Hampshire's state radon program

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

Where Cheshire 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.