Bonne Terre, MO Radon Levels

Q: What is the average radon level in Bonne Terre, MO?

Based on 2 user-submitted tests, the average radon level is 4.50 pCi/L.

Q: What EPA Radon Zone is Bonne Terre in?

Bonne Terre is in St Francois County, EPA Zone Unknown.

Q: How much does radon mitigation cost in Bonne Terre?

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

Check local Bonne Terre radon levels and find certified testing and mitigation professionals to keep your home safe

Bonne Terre, MO Radon Facts

EPA Radon Zone Unknown Unknown

County St Francois County, MO

Zip Code 63628

Avg. User Level 4.50 pCi/L

User Tests 2

Situated in St Francois County in the Missouri Lead Belt region, Bonne Terre shows an average radon level of 4.5 pCi/L based on limited testing data, which slightly exceeds the EPA action threshold. The area's mining history and underlying Cambrian dolomite formations create geological conditions that can contribute to elevated radon levels. Homes in this part of the St. Louis Metro typically feature full basements where radon can accumulate, making testing and potential mitigation important for resident safety.

4.50

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Bonne Terre, MO Radon Mitigation

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Bonne Terre, Missouri Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
6 pCi/L	Bonne Terre, MO	21-50 Years	—	Dec 2025
3 pCi/L	Bonne Terre, MO	0-20 Years	Full Basement	Jul 2024

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

St Francois County Radon Profile

St Francois County has not been assigned a definitive EPA radon zone, so the agency recommends that every home be tested regardless of predicted risk. Homeowner-submitted tests from 2 cities in St Francois County average 7.00 pCi/L across 4 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in St Francois County.

Radon FAQ for Bonne Terre, MO

What is the average radon level in Bonne Terre, MO?

Based on 2 user-submitted tests, the average radon level in Bonne Terre is 4.50 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 Bonne Terre in?

Bonne Terre and the 63628 zip code are in St Francois County, which has an EPA assigned Radon Zone of Unknown. A zone of Unknown does not have sufficient data for classification.

How much does radon mitigation cost in Bonne Terre?

Radon mitigation in Bonne Terre 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 Bonne Terre?

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.

Radon Levels Near Bonne Terre, MO

User-submitted radon levels from the cities closest to Bonne Terre with recorded test data. Explore nearby communities to compare local readings.

City	Distance	Avg User Level	Submissions
Farmington	12.8 mi	9.50 pCi/L	2
De Soto	13.6 mi	11.00 pCi/L	1
Festus	19.6 mi	5.00 pCi/L	2