Fountain County, IN radon potential

EPA's own radon map rates Fountain County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally that's the 80th percentile for radon potential — Fountain County outranks 80% of every county EPA has rated.

Where Fountain County sits nationally

Fountain County, Indiana is home to about 16,833 people across 395.661 square miles. Population density there runs about 43 people per square mile. Within its own EPA zone, Fountain County is bigger by population than 42% of the counties that share it. Geologically, Fountain County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

Fountain 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. 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 Fountain County will test well under the action level, and EPA's guidance is to test regardless of zone.

If Fountain 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 Indiana's state radon program

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

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