Knoxville, AR Radon Mitigation and Testing

Q: What EPA Radon Zone is Knoxville in?

Knoxville is in Johnson County, EPA Zone 3.

Q: How much does radon mitigation cost in Knoxville?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Johnson County

EPA Zone 3

Situated in Johnson County in the Arkansas River Valley, Knoxville lies within the Ouachita Mountain foothills where sedimentary rock formations can influence indoor radon levels. With testing data currently limited for zip code 72845, residents should conduct home radon testing to understand their specific exposure levels in this mountainous region of west-central Arkansas.

Knoxville, AR Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Knoxville, AR Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Knoxville Radon Facts

Key details about the radon risk profile for Knoxville and the 72845 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Johnson County, AR

Zip Code

72845

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Knoxville and the 72845 zip code are located in Johnson County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Knoxville, AR

What EPA Radon Zone is Knoxville in?

Knoxville and the 72845 zip code are in Johnson County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Knoxville?

Radon mitigation in Knoxville typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Knoxville?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Most Active Radon Markets in Arkansas

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Hot Springs Village	11.60 pCi/L	5
Bentonville	4.00 pCi/L	4
Bella Vista	13.67 pCi/L	3
Little Rock	7.00 pCi/L	1