Jasper County, IA radon potential

EPA places Jasper 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. That puts Jasper County in the 87th percentile nationally for radon potential — higher than 87% of the counties EPA has rated.

How Jasper County compares

Jasper County, Iowa is home to about 38,107 people across 730.428 square miles. That works out to roughly 52 people per square mile. Within its own EPA zone, Jasper County is bigger by population than 63% of the counties that share it. EPA's geology-based Region 7 groups Jasper County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Jasper County

Jasper 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. Being in Zone 1 raises the odds Jasper 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.

Testing and mitigation in Jasper 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 Iowa's state radon program

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

Where Jasper County's figures come from

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