Saint Ann, MO Radon Levels

Q: What EPA Radon Zone is Saint Ann in?

Saint Ann is in St Louis County, EPA Zone Unknown.

Q: How much does radon mitigation cost in Saint Ann?

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

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

Saint Ann, MO Radon Facts

EPA Radon Zone Unknown Unknown

County St Louis County, MO

Zip Code 63074

This St Louis County community in the St. Louis Metro area sits on Missouri's glacial till deposits over limestone bedrock, geological conditions that can support radon gas migration. Testing data for Saint Ann remains sparse, making individual home testing crucial for residents in zip code 63074. The area's predominantly mid-century housing stock with full basements provides ideal conditions for radon accumulation if present.

12.20

pCi/L area average

Above EPA Action Level

St Louis County average: 12.20 pCi/L, based on 5 user-submitted tests across 4 cities in the county. No homeowner readings have been submitted for Saint Ann itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Saint Ann, MO Radon Mitigation

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

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Radon Readings Near Saint Ann, MO

No homeowner tests have been submitted for Saint Ann yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Hazelwood	3.9 mi	20.00 pCi/L	1
Saint Charles	9.7 mi	5.00 pCi/L	1
Chesterfield	11.8 mi	5.00 pCi/L	1
Ballwin	12.5 mi	4.00 pCi/L	1
Saint Peters	13.3 mi	7.00 pCi/L	1
Fenton	16.1 mi	16.00 pCi/L	2
O Fallon	19.3 mi	7.75 pCi/L	4
Arnold	20.4 mi	10.50 pCi/L	2

St Louis County Radon Profile

St Louis 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 4 cities in St Louis County average 12.20 pCi/L across 5 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 Louis County.

Radon FAQ for Saint Ann, MO

What EPA Radon Zone is Saint Ann in?

Saint Ann and the 63074 zip code are in St Louis County, which has an EPA assigned Radon Zone of Unknown. A zone of Unknown does not have sufficient data for classification.

Why are radon readings shown from areas near Saint Ann?

No homeowner radon tests have been submitted for Saint Ann yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the St Louis County average—are the best available indicator of local conditions until Saint Ann homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

How much does radon mitigation cost in Saint Ann?

Radon mitigation in Saint Ann 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 Saint Ann?

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.