Is Dinwiddie County, VA a radon risk area?

Dinwiddie County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally that's the 85th percentile for radon potential — Dinwiddie County outranks 85% of every county EPA has rated.

Dinwiddie County by the numbers

About 28,576 people live in Dinwiddie County, Virginia, spread over 503.826 square miles. Population density there runs about 57 people per square mile. Rank 481 by population within its EPA zone puts Dinwiddie County at the 55th percentile among zone peers. Geologically, Dinwiddie 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 Dinwiddie County

Where the national indoor average runs about 1.3 pCi/L, Dinwiddie County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Being in Zone 1 raises the odds Dinwiddie County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Testing and mitigation in Dinwiddie County

Nothing about Dinwiddie County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Virginia's state radon program

Dinwiddie County's test kit answers today; a Airthings radon monitor keeps answering for Dinwiddie County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

Dinwiddie County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.