De Soto, MO Radon Levels

Q: What is the average radon level in De Soto, MO?

Based on 1 user-submitted tests, the average radon level is 11.00 pCi/L.

Q: What EPA Radon Zone is De Soto in?

De Soto is in Jefferson County, EPA Zone 2.

Q: How much does radon mitigation cost in De Soto?

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

Check local De Soto radon levels and find certified testing and mitigation professionals to keep your home safe

De Soto, MO Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Jefferson County, MO

Zip Code 63020

Avg. User Level 11.00 pCi/L

User Tests 1

Based on recent testing in Jefferson County, De Soto shows an average radon level of 11.0 pCi/L, which significantly exceeds the EPA action threshold of 4.0 pCi/L. This St. Louis Metro community sits atop Ordovician limestone formations that can contribute to elevated radon concentrations in homes with basements. Given this elevated reading in zip code 63020, all area homeowners should prioritize professional radon testing and mitigation if needed.

11.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

De Soto, MO Radon Mitigation

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

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De Soto, Missouri Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
11 pCi/L	De Soto, MO	0-20 Years	Full Basement	Aug 2024

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

Jefferson County Radon Profile

Jefferson County is mapped as EPA Radon Zone 2, where the local geology is predicted to produce moderate indoor screening levels between 2 and 4 pCi/L. Homeowner-submitted tests from 5 cities in Jefferson County average 8.86 pCi/L across 7 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 Jefferson County.

Radon FAQ for De Soto, MO

What is the average radon level in De Soto, MO?

Based on 1 user-submitted test, the average radon level in De Soto is 11.00 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 De Soto in?

De Soto and the 63020 zip code are in Jefferson County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

How much does radon mitigation cost in De Soto?

Radon mitigation in De Soto 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 De Soto?

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 De Soto, MO

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

City	Distance	Avg User Level	Submissions
Festus	8.3 mi	5.00 pCi/L	2
Bonne Terre	13.6 mi	4.50 pCi/L	2
House Springs	20.2 mi	7.00 pCi/L	1
Imperial	20.8 mi	13.00 pCi/L	1
Arnold	23.3 mi	10.50 pCi/L	2
Farmington	25.0 mi	9.50 pCi/L	2