Natrona County, WY radon potential

EPA's own radon map rates Natrona County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Natrona County lands in the 93rd percentile for radon potential.

Where Natrona County sits nationally

Natrona County, Wyoming is home to about 80,410 people across 5,340.537 square miles. Population density there runs about 15 people per square mile. Within its own EPA zone, Natrona County is bigger by population than 79% of the counties that share it. EPA's geology-based Region 8 groups Natrona County with 290 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Natrona County 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. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Natrona County specifically.

Testing and mitigation in Natrona 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 Wyoming's state radon program

For Natrona County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Natrona 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 Natrona County's figures come from

Natrona County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.