Hillsboro, MO Radon Levels

Q: What EPA Radon Zone is Hillsboro in?

Hillsboro is in Jefferson County, EPA Zone 2.

Q: How much does radon mitigation cost in Hillsboro?

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

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

Hillsboro, MO Radon Facts

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

County Jefferson County, MO

Zip Code 63050

Located in Jefferson County within the St. Louis Metro area, Hillsboro sits over Mississippian limestone and dolomite bedrock that can contribute to radon accumulation throughout the region. The community in zip code 63050 features a mix of older rural homes and newer suburban development, many with full basements typical of Missouri construction. Testing data remains limited, making baseline radon measurement advisable for area homeowners.

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 Hillsboro 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+

Hillsboro, 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 Hillsboro, MO

No homeowner tests have been submitted for Hillsboro 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	9.5 mi	5.00 pCi/L	2
De Soto	9.6 mi	11.00 pCi/L	1
House Springs	10.7 mi	7.00 pCi/L	1
Imperial	12.8 mi	13.00 pCi/L	1
Arnold	15.8 mi	10.50 pCi/L	2
Fenton	17.8 mi	16.00 pCi/L	2
Ballwin	23.2 mi	4.00 pCi/L	1
Bonne Terre	23.2 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 Hillsboro, MO

What EPA Radon Zone is Hillsboro in?

Hillsboro and the 63050 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 Hillsboro?

No homeowner radon tests have been submitted for Hillsboro 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 Hillsboro 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 Hillsboro?

Radon mitigation in Hillsboro 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 Hillsboro?

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.