Manassas city, VA radon potential

EPA places Manassas city 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. Rank it against the rest of the country and Manassas city lands in the 89th percentile for radon potential.

How Manassas city compares

Manassas city, Virginia is home to about 43,616 people across 9.843 square miles. Averaged across its land area, Manassas city runs about 4,431 people per square mile. Within its own EPA zone, Manassas city is bigger by population than 67% of the counties that share it.

Zone vs. an actual test

Manassas 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. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Manassas city will test well under the action level, and EPA's guidance is to test regardless of zone.

Next steps for a home in Manassas city

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

Where Manassas city's figures come from

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