Union, MO Radon Mitigation and Testing

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.

Avg: 13.00 pCi/L

Franklin County

EPA Zone 2

1 user test

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.

Union, MO Radon Testing

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

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.

Union Radon Facts

Key details about the radon risk profile for Union and the 63084 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Franklin County, MO

Zip Code

63084

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

13.00 pCi/L

User Tests Submitted

Union and the 63084 zip code are located in Franklin County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

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.

Most Active Radon Markets in Missouri

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

City	Avg User Radon Level	Submissions
Troy	8.50 pCi/L	4
Lees Summit	7.00 pCi/L	3
Columbia	3.00 pCi/L	2
House Springs	7.00 pCi/L	1
Kansas City	7.00 pCi/L	1
Springfield	7.00 pCi/L	1
Independence	5.00 pCi/L	1
Wentzville	No submissions	0