Louisville, KY Radon Mitigation and Testing

Q: What is the average radon level in Louisville, KY?

Based on 2 user-submitted tests, the average radon level is 5.50 pCi/L.

Q: What EPA Radon Zone is Louisville in?

Louisville is in Jefferson County, EPA Zone 1.

Q: How much does radon mitigation cost in Louisville?

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

Avg: 5.50 pCi/L

Jefferson County

EPA Zone 1

2 user tests

Kentucky's largest city in Jefferson County shows an average radon level of 5.5 pCi/L, which exceeds the EPA's action threshold of 4.0 pCi/L. Based on testing data showing readings between 4.0 and 7.0 pCi/L, Louisville homeowners should prioritize radon testing and mitigation when necessary. The city's diverse housing stock, from historic neighborhoods to modern suburbs, sits on limestone bedrock that contributes to elevated radon potential throughout the metro area.

5.50

pCi/L average

Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Louisville, KY. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Louisville, KY Radon Mitigation

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

Louisville, KY Radon Testing

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

Louisville, Kentucky Radon Levels

User-submitted radon test readings from homes in the Louisville area.

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	Louisville, KY	51-99 Years	Full Basement	Apr 2019
7 pCi/L	Louisville, KY	0-20 Years	Full Basement	Aug 2018

Have a radon test result for Louisville? Submit your reading to help other homeowners.

Louisville Radon Facts

Key details about the radon risk profile for Louisville and the 40202 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Jefferson County, KY

Zip Code

40202

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

5.50 pCi/L

User Tests Submitted

Louisville and the 40202 zip code are located in Jefferson County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Louisville, KY

What is the average radon level in Louisville, KY?

Based on 2 user-submitted tests, the average radon level in Louisville is 5.50 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Louisville in?

Louisville and the 40202 zip code are in Jefferson County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Louisville?

Radon mitigation in Louisville 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 Louisville?

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 Kentucky

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

City	Avg User Radon Level	Submissions
Bowling Green	15.80 pCi/L	5
Lexington	8.40 pCi/L	5
Frankfort	7.80 pCi/L	5
Florence	5.40 pCi/L	5
Owensboro	5.33 pCi/L	3
Union	4.67 pCi/L	3
Brandenburg	11.50 pCi/L	2
Harrodsburg	9.00 pCi/L	2
Louisville	5.50 pCi/L	2
Campbellsville	11.00 pCi/L	1