Judith Basin County, MT radon potential

EPA places Judith Basin County 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. Nationally that's the 67th percentile for radon potential — Judith Basin County outranks 67% of every county EPA has rated.

Where Judith Basin County sits nationally

Judith Basin County, Montana is home to about 2,111 people across 1,869.687 square miles. Population density there runs about 1 people per square mile. Within its own EPA zone, Judith Basin County is bigger by population than 4% of the counties that share it. EPA's geology-based Region 8 groups Judith Basin County with 290 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Judith Basin County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. 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 Judith Basin County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Judith Basin 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 Montana's state radon program

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

Where Judith Basin County's figures come from

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