Wilmington, OH Radon Mitigation and Testing

Q: What is the average radon level in Wilmington, OH?

Based on 4 user-submitted tests, the average radon level is 5.30 pCi/L.

Q: What EPA Radon Zone is Wilmington in?

Wilmington is in Clinton County, EPA Zone 1.

Q: How much does radon mitigation cost in Wilmington?

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

Avg: 5.30 pCi/L

Clinton County

EPA Zone 1

4 user tests

Wilmington is located in Clinton County, Ohio. With 4 user-submitted readings averaging 5.30 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 45177 zip code.

5.30

pCi/L average

Above EPA Action Level

Based on 4 user-submitted radon tests for homes in Wilmington, OH. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Wilmington, OH Radon Mitigation

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

Wilmington, OH Radon Testing

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

Wilmington, Ohio Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
5 pCi/L	Wilmington, OH	21-50 Years	Full Basement	Jul 2025
4 pCi/L	Wilmington, OH	51-99 Years	Full Basement	May 2022
7 pCi/L	Wilmington, OH	21-50 Years	No Basement/All Slab	Nov 2017

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

Wilmington Radon Facts

Key details about the radon risk profile for Wilmington and the 45177 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Clinton County, OH

Zip Code

45177

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

5.30 pCi/L

User Tests Submitted

Wilmington and the 45177 zip code are located in Clinton 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 Wilmington, OH

What is the average radon level in Wilmington, OH?

Based on 4 user-submitted tests, the average radon level in Wilmington is 5.30 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 Wilmington in?

Wilmington and the 45177 zip code are in Clinton 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 Wilmington?

Radon mitigation in Wilmington 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 Wilmington?

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 Ohio

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

City	Avg User Radon Level	Submissions
Marietta	8.00 pCi/L	5
Cincinnati	5.20 pCi/L	5
Hilliard	11.75 pCi/L	4
Wilmington	5.25 pCi/L	4
Newark	15.00 pCi/L	3
Athens	11.33 pCi/L	3
Findlay	10.33 pCi/L	3
Perrysburg	9.67 pCi/L	3
Powell	8.33 pCi/L	3
Columbus	6.00 pCi/L	3
Chagrin Falls	4.67 pCi/L	3
Hamilton	10.00 pCi/L	2
Chardon	5.50 pCi/L	2
Strongsville	4.50 pCi/L	2
Maineville	10.00 pCi/L	1
Lancaster	9.00 pCi/L	1
West Chester	9.00 pCi/L	1
Amherst	6.00 pCi/L	1
Chillicothe	6.00 pCi/L	1
Lima	5.00 pCi/L	1