London, OH Radon Mitigation and Testing

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

Based on 1 user-submitted tests, the average radon level is 9.00 pCi/L.

Q: What EPA Radon Zone is London in?

London is in Madison County, EPA Zone 1.

Q: How much does radon mitigation cost in London?

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

Avg: 9.00 pCi/L

Madison County

EPA Zone 1

1 user test

London in Madison County shows concerning radon levels with testing revealing a 9.0 pCi/L average, well above the EPA's recommended 4.0 threshold. Part of the Columbus Metro area, this 43140 community sits on glacial deposits over limestone bedrock that creates favorable conditions for radon accumulation. The area's predominantly full-basement construction provides enclosed spaces where radon can concentrate to dangerous levels.

9.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in London, OH. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

London, OH Radon Mitigation

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

London, OH Radon Testing

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

London, Ohio Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
9 pCi/L	London, OH	0-20 Years	Full Basement	Feb 2017

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

London Radon Facts

Key details about the radon risk profile for London and the 43140 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Madison County, OH

Zip Code

43140

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

9.00 pCi/L

User Tests Submitted

London and the 43140 zip code are located in Madison 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 London, OH

What is the average radon level in London, OH?

Based on 1 user-submitted test, the average radon level in London is 9.00 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 London in?

London and the 43140 zip code are in Madison 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 London?

Radon mitigation in London 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 London?

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