Richmond County, NC radon potential

Richmond County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 20th percentile for radon potential — Richmond County outranks 20% of every county EPA has rated.

How Richmond County compares

Richmond County, North Carolina is home to about 41,990 people across 473.689 square miles. That works out to roughly 89 people per square mile. Within its own EPA zone, Richmond County is bigger by population than 62% of the counties that share it. Richmond County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

At Zone 3, Richmond 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. A Zone 3 label describes Richmond County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Richmond 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 North Carolina's state radon program

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

Where Richmond County's figures come from

Richmond County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Richmond County carries, the zone explainer covers what it does and doesn't tell you about any one house.