Tyrrell County, NC radon potential

EPA places Tyrrell County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Tyrrell County in the 2nd percentile nationally for radon potential — higher than 2% of the counties EPA has rated.

How Tyrrell County compares

Tyrrell County, North Carolina is home to about 3,517 people across 390.777 square miles. Population density there runs about 9 people per square mile. Within its own EPA zone, Tyrrell County is bigger by population than 6% of the counties that share it. Tyrrell County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Tyrrell County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 label describes Tyrrell County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

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

Where Tyrrell County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Tyrrell County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.