Pitkin County, CO radon potential

EPA's own radon map rates Pitkin County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Pitkin County in the 80th percentile nationally for radon potential — higher than 80% of the counties EPA has rated.

Pitkin County by the numbers

Pitkin County, Colorado is home to about 16,643 people across 970.701 square miles. Population density there runs about 17 people per square mile. Within its own EPA zone, Pitkin County is bigger by population than 41% of the counties that share it. Geologically, Pitkin County is grouped into EPA Region 8 alongside 290 other counties that share its rock and soil setting.

What this actually means for a house in Pitkin County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Pitkin County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Some Pitkin County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

If Pitkin 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 Colorado's state radon program

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

The methodology guide shows exactly which EPA and Census sources feed Pitkin County's numbers. Whatever zone Pitkin County carries, the zone explainer covers what it does and doesn't tell you about any one house.