What EPA's radon map says about Manassas Park city

Manassas Park city 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 80th percentile for radon potential — Manassas Park city outranks 80% of every county EPA has rated.

Manassas Park city by the numbers

About 16,611 people live in Manassas Park city, Virginia, spread over 3.025 square miles. Population density there runs about 5,491 people per square mile. Among counties sharing Manassas Park city's EPA zone, it outranks 41% of them by population.

Why the zone isn't the answer by itself

Manassas Park city 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. Some Manassas Park city homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Next steps for a home in Manassas Park city

Mitigation cost doesn't depend on Manassas Park city's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Virginia's state radon program

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

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.