Robertsville, MO Radon Levels

Q: What EPA Radon Zone is Robertsville in?

Robertsville is in Franklin County, EPA Zone 2.

Q: How much does radon mitigation cost in Robertsville?

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

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

Robertsville, MO Radon Facts

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

County Franklin County, MO

Zip Code 63072

Located in Franklin County within the St. Louis metropolitan area, Robertsville sits where Ozark foothills meet Missouri River valley terrain. While radon testing data for this community remains limited, homeowners should consider testing given the county's mix of limestone bedrock and residential properties with varying foundation types. Testing is especially recommended for homes with basements or crawl spaces in zip code 63072.

7.33

pCi/L area average

Above EPA Action Level

Franklin County average: 7.33 pCi/L, based on 3 user-submitted tests across 3 cities in the county. No homeowner readings have been submitted for Robertsville 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+

Robertsville, 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 Robertsville, MO

No homeowner tests have been submitted for Robertsville 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
Labadie	10.4 mi	4.00 pCi/L	1
Union	12.7 mi	13.00 pCi/L	1
House Springs	13.4 mi	7.00 pCi/L	1
Imperial	19.8 mi	13.00 pCi/L	1
Fenton	19.8 mi	16.00 pCi/L	2
Ballwin	20.2 mi	4.00 pCi/L	1
Chesterfield	21.7 mi	5.00 pCi/L	1
De Soto	22.5 mi	11.00 pCi/L	1

Franklin County Radon Profile

EPA mapping assigns Franklin 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 3 cities in Franklin County average 7.33 pCi/L across 3 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 Franklin County home regardless of zone or a neighbor's results.

Radon FAQ for Robertsville, MO

What EPA Radon Zone is Robertsville in?

Robertsville and the 63072 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.

Why are radon readings shown from areas near Robertsville?

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

Radon mitigation in Robertsville 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 Robertsville?

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.