Indianapolis, IN Radon Mitigation and Testing

Q: What is the average radon level in Indianapolis, IN?

Based on 2 user-submitted tests, the average radon level is 4.00 pCi/L.

Q: What EPA Radon Zone is Indianapolis in?

Indianapolis is in Marion County, EPA Zone 1.

Q: How much does radon mitigation cost in Indianapolis?

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

Avg: 4.00 pCi/L

Marion County

EPA Zone 1

2 user tests

Indianapolis is located in Marion County, Indiana. With 2 user-submitted readings averaging 4.00 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 46201 zip code.

4.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Indianapolis, IN Radon Mitigation

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

Indianapolis, IN Radon Testing

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

Indianapolis, Indiana Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
1 pCi/L	Indianapolis, IN	51-99 Years	No Basement/All Slab	Oct 2025
7 pCi/L	Indianapolis , IN	51-99 Years	Full Basement	Sep 2016

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

Indianapolis Radon Facts

Key details about the radon risk profile for Indianapolis and the 46201 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Marion County, IN

Zip Code

46201

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

4.00 pCi/L

User Tests Submitted

Indianapolis and the 46201 zip code are located in Marion 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 Indianapolis, IN

What is the average radon level in Indianapolis, IN?

Based on 2 user-submitted tests, the average radon level in Indianapolis is 4.00 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 Indianapolis in?

Indianapolis and the 46201 zip code are in Marion 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 Indianapolis?

Radon mitigation in Indianapolis 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 Indianapolis?

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 Indiana

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

City	Avg User Radon Level	Submissions
Bloomington	8.14 pCi/L	7
Kokomo	7.40 pCi/L	5
Lafayette	15.00 pCi/L	3
Valparaiso	10.00 pCi/L	3
Avon	6.00 pCi/L	3
West Lafayette	10.50 pCi/L	2
Dyer	9.50 pCi/L	2
Columbus	7.50 pCi/L	2
Noblesville	7.00 pCi/L	2
Westfield	7.00 pCi/L	2
Fishers	6.50 pCi/L	2
Corydon	6.00 pCi/L	2
Warsaw	5.50 pCi/L	2
Indianapolis	4.00 pCi/L	2
Newburgh	8.00 pCi/L	1
Logansport	7.00 pCi/L	1
Terre Haute	5.00 pCi/L	1
Muncie	4.00 pCi/L	1
Brownsburg	No submissions	0