Blackford County, IN Radon Zone Data

Blackford County, IN radon potential

EPA places Blackford 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. Rank it against the rest of the country and Blackford County lands in the 77th percentile for radon potential.

How Blackford County compares

Blackford County, Indiana is home to about 11,816 people across 165.082 square miles. Averaged across its land area, Blackford County runs about 72 people per square mile. Within its own EPA zone, Blackford County is bigger by population than 32% of the counties that share it. Geologically, Blackford County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

Blackford 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. 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 Blackford County specifically.

Next steps for a home in Blackford 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 Indiana's state radon program

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

Where Blackford County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Blackford County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.