Winfield, MO Radon Levels

Q: What EPA Radon Zone is Winfield in?

Winfield is in Lincoln County, EPA Zone 2.

Q: How much does radon mitigation cost in Winfield?

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

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

Winfield, MO Radon Facts

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

County Lincoln County, MO

Zip Code 63389

Situated in Lincoln County within the greater St. Louis Metro area, Winfield sits along the Missouri River corridor where alluvial soils overlay limestone formations. Testing data for the 63389 zip code is currently limited, making baseline testing crucial for area homeowners. The community's proximity to the river valley and underlying geology create variable radon conditions that can differ notably between individual properties.

8.50

pCi/L area average

Above EPA Action Level

Lincoln County average: 8.50 pCi/L, based on 4 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Winfield 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+

Winfield, 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 Winfield, MO

No homeowner tests have been submitted for Winfield 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
Troy	7.6 mi	8.50 pCi/L	4
Lake Saint Louis	13.7 mi	5.00 pCi/L	2
O Fallon	14.7 mi	7.75 pCi/L	4
Saint Peters	18.0 mi	7.00 pCi/L	1
Saint Charles	20.9 mi	5.00 pCi/L	1
Chesterfield	27.5 mi	5.00 pCi/L	1
Hazelwood	28.4 mi	20.00 pCi/L	1
Ballwin	31.2 mi	4.00 pCi/L	1

Lincoln County Radon Profile

EPA mapping assigns Lincoln 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 1 city in Lincoln County average 8.50 pCi/L across 4 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 Lincoln County home regardless of zone or a neighbor's results.

Radon FAQ for Winfield, MO

What EPA Radon Zone is Winfield in?

Winfield and the 63389 zip code are in Lincoln 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.

Why are radon readings shown from areas near Winfield?

No homeowner radon tests have been submitted for Winfield yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Lincoln County average—are the best available indicator of local conditions until Winfield 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 Winfield?

Radon mitigation in Winfield 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 Winfield?

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.