Gray Summit, MO Radon Mitigation and Testing

Q: What EPA Radon Zone is Gray Summit in?

Gray Summit is in Franklin County, EPA Zone 2.

Q: How much does radon mitigation cost in Gray Summit?

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

Franklin County

EPA Zone 2

This Franklin County community within the St. Louis metropolitan area sits on Missouri's Ozark fringe, where limestone bedrock and karst features create conditions favorable for radon gas production and accumulation. Although testing data for zip code 63039 is currently limited, the area's geological characteristics suggest residents should test their homes for radon. Properties built over the region's extensive limestone formations may experience elevated radon levels through natural fractures and cave systems.

Gray Summit, MO Radon Mitigation

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

Gray Summit, MO Radon Testing

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

Gray Summit Radon Facts

Key details about the radon risk profile for Gray Summit and the 63039 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Franklin County, MO

Zip Code

63039

Predicted Screening Level

2–4 pCi/L (Zone 2)

Gray Summit and the 63039 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 Gray Summit, MO

What EPA Radon Zone is Gray Summit in?

Gray Summit and the 63039 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 Gray Summit?

Radon mitigation in Gray Summit 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 Gray Summit?

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