Williamsburg, MO Radon Levels

Q: What EPA Radon Zone is Williamsburg in?

Williamsburg is in Callaway County, EPA Zone 2.

Q: How much does radon mitigation cost in Williamsburg?

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

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

Williamsburg, MO Radon Facts

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

County Callaway County, MO

Zip Code 63388

Situated in Callaway County within the Jefferson City Metro area, Williamsburg sits in EPA Zone 2 where Missouri River valley deposits over limestone bedrock create moderate radon conditions. Testing data for this 63388 community is unavailable, making home-specific assessment crucial. The area's combination of alluvial soils and underlying Paleozoic formations, typical of central Missouri, can produce variable radon levels that only direct testing can properly evaluate.

4.00

pCi/L area average

Above EPA Action Level

Callaway County average: 4.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Williamsburg 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+

Williamsburg, 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 Williamsburg, MO

No homeowner tests have been submitted for Williamsburg 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
Mexico	20.6 mi	4.00 pCi/L	1
Holts Summit	25.7 mi	4.00 pCi/L	1
Columbia	27.2 mi	3.00 pCi/L	2
Hallsville	28.7 mi	5.00 pCi/L	2
Jefferson City	32.3 mi	6.00 pCi/L	1
New Haven	36.3 mi	5.00 pCi/L	1
Troy	44.0 mi	8.50 pCi/L	4

Callaway County Radon Profile

EPA mapping assigns Callaway 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 Callaway County average 4.00 pCi/L across 1 test — 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 Callaway County home regardless of zone or a neighbor's results.

Radon FAQ for Williamsburg, MO

What EPA Radon Zone is Williamsburg in?

Williamsburg and the 63388 zip code are in Callaway 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 Williamsburg?

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

Radon mitigation in Williamsburg 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 Williamsburg?

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.