Cavalier County, ND radon potential

Cavalier 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 69th percentile for radon potential — Cavalier County outranks 69% of every county EPA has rated.

Cavalier County by the numbers

Cavalier County, North Dakota is home to about 3,567 people across 1,489.125 square miles. That works out to roughly 2 people per square mile. Within its own EPA zone, Cavalier County is bigger by population than 9% of the counties that share it. Cavalier County falls in EPA Radon Region 8, one of 291 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Cavalier County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. Being in Zone 1 raises the odds Cavalier 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.

Next steps for a home in Cavalier 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 North Dakota's state radon program

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

Where Cavalier County's figures come from

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