Chesterfield County, VA radon potential

EPA places Chesterfield County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Chesterfield County in the 98th percentile nationally for radon potential — higher than 98% of the counties EPA has rated.

Chesterfield County by the numbers

Chesterfield County, Virginia is home to about 389,793 people across 423.51 square miles. That works out to roughly 920 people per square mile. Within its own EPA zone, Chesterfield County is bigger by population than 95% of the counties that share it. Geologically, Chesterfield County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

What this actually means for a house in Chesterfield County

Chesterfield County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. That doesn't mean every Chesterfield County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Testing and mitigation in Chesterfield 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 Virginia's state radon program

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

Where Chesterfield County's figures come from

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