Herculaneum, MO Radon Levels

Q: What EPA Radon Zone is Herculaneum in?

Herculaneum is in Jefferson County, EPA Zone 2.

Q: How much does radon mitigation cost in Herculaneum?

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

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

Herculaneum, MO Radon Facts

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

County Jefferson County, MO

Zip Code 63048

Situated in Jefferson County along the Mississippi River south of St. Louis, Herculaneum rests on limestone bluffs that can produce elevated radon levels in some areas. Testing data for zip code 63048 remains limited, highlighting the importance of individual home testing. Properties in this historic St. Louis Metro community range from older homes with stone foundations to newer construction, each requiring radon evaluation.

8.86

pCi/L area average

Above EPA Action Level

Jefferson County average: 8.86 pCi/L, based on 7 user-submitted tests across 5 cities in the county. No homeowner readings have been submitted for Herculaneum 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+

Herculaneum, 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 Herculaneum, MO

No homeowner tests have been submitted for Herculaneum 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
Festus	5.6 mi	5.00 pCi/L	2
Imperial	10.3 mi	13.00 pCi/L	1
Arnold	11.6 mi	10.50 pCi/L	2
De Soto	13.3 mi	11.00 pCi/L	1
House Springs	13.8 mi	7.00 pCi/L	1
Fenton	17.1 mi	16.00 pCi/L	2
Ballwin	24.3 mi	4.00 pCi/L	1
Bonne Terre	25.1 mi	4.50 pCi/L	2

Jefferson County Radon Profile

Jefferson County is mapped as EPA Radon Zone 2, where the local geology is predicted to produce moderate indoor screening levels between 2 and 4 pCi/L. Homeowner-submitted tests from 5 cities in Jefferson County average 8.86 pCi/L across 7 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 Jefferson County.

Radon FAQ for Herculaneum, MO

What EPA Radon Zone is Herculaneum in?

Herculaneum and the 63048 zip code are in Jefferson 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 Herculaneum?

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

Radon mitigation in Herculaneum 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 Herculaneum?

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.