Union, MO Radon Levels

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

Based on 1 user-submitted tests, the average radon level is 13.00 pCi/L.

Q: What EPA Radon Zone is Union in?

Union is in Franklin County, EPA Zone 2.

Q: How much does radon mitigation cost in Union?

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

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

Union, MO Radon Facts

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

County Franklin County, MO

Zip Code 63084

Avg. User Level 13.00 pCi/L

User Tests 1

Residents of Union in Franklin County should be aware that local testing has revealed an average radon level of 13.0 pCi/L, significantly exceeding the EPA's 4.0 pCi/L action threshold. This St. Louis Metro community's elevated readings reflect the area's limestone bedrock and soil conditions that facilitate radon gas migration into homes. Immediate radon mitigation is strongly recommended for homeowners in zip code 63084.

13.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Union, MO Radon Mitigation

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

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Union, Missouri Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
13 pCi/L	Union, MO	21-50 Years	Full Basement	Dec 2024

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

Franklin County Radon Profile

EPA mapping assigns Franklin County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 3 cities in Franklin County average 7.33 pCi/L across 3 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Franklin County home regardless of zone or a neighbor's results.

Radon FAQ for Union, MO

What is the average radon level in Union, MO?

Based on 1 user-submitted test, the average radon level in Union is 13.00 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 Union in?

Union and the 63084 zip code are in Franklin 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 Union?

Radon mitigation in Union 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 Union?

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 Union, MO

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

City	Distance	Avg User Level	Submissions
Labadie	9.3 mi	4.00 pCi/L	1
New Haven	14.3 mi	5.00 pCi/L	1
Bourbon	21.8 mi	6.00 pCi/L	1