Dennison, IL Radon Levels

Q: What EPA Radon Zone is Dennison in?

Dennison is in Clark County, EPA Zone 2.

Q: How much does radon mitigation cost in Dennison?

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

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

Dennison, IL Radon Facts

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

County Clark County, IL

Zip Code 62423

This small community in Clark County sits within the central Illinois prairie region, where glacial deposits over limestone bedrock contribute to the state's moderate radon potential. Testing data for Dennison's 62423 zip code is currently limited, making individual home testing essential for residents to understand their specific radon exposure levels.

11.07

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 11.07 pCi/L, based on 14 tests from 7 nearby cities. No readings have been submitted for Dennison yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Dennison, IL 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 Dennison, IL

No homeowner tests have been submitted for Dennison 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
Paris	12.8 mi	9.67 pCi/L	3
Palestine	30.9 mi	18.50 pCi/L	2
Charleston	31.5 mi	8.00 pCi/L	1
Mattoon	42.2 mi	9.33 pCi/L	3
Tuscola	44.2 mi	17.00 pCi/L	1
Homer	45.1 mi	20.00 pCi/L	1
Danville	48.4 mi	5.33 pCi/L	3

Clark County Radon Profile

Clark 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. User-submitted readings are still sparse within Clark County itself, so the nearby measurements shown on this page provide the closest real-world picture of local radon conditions. 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 Clark County.

Radon FAQ for Dennison, IL

What EPA Radon Zone is Dennison in?

Dennison and the 62423 zip code are in Clark 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 Dennison?

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

Radon mitigation in Dennison 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 Dennison?

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.