Colchester, IL Radon Levels

Q: What EPA Radon Zone is Colchester in?

Colchester is in McDonough County, EPA Zone 1.

Q: How much does radon mitigation cost in Colchester?

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

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

Colchester, IL Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County McDonough County, IL

Zip Code 62326

Found in western Illinois's McDonough County, Colchester sits on glacial drift over Pennsylvanian bedrock within EPA Zone 1, indicating elevated radon potential across the region. The community around 62326 features rural residential properties and historic homes with varied foundation types common to western Illinois farming areas. While specific testing data isn't available, the geological conditions suggest homeowners should conduct professional radon assessments to determine if levels warrant mitigation measures.

8.44

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 8.44 pCi/L, based on 9 tests from 7 nearby cities. No readings have been submitted for Colchester 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+

Colchester, 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 Colchester, IL

No homeowner tests have been submitted for Colchester 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
Dallas City	20.9 mi	9.00 pCi/L	1
Stronghurst	24.4 mi	13.00 pCi/L	2
Cuba	32.3 mi	6.00 pCi/L	1
Monmouth	35.0 mi	8.00 pCi/L	1
Knoxville	43.0 mi	8.00 pCi/L	1
Quincy	43.7 mi	7.50 pCi/L	2
Griggsville	49.0 mi	4.00 pCi/L	1

McDonough County Radon Profile

Because of its underlying geology, McDonough County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Direct test data for McDonough County remains limited, so the closest neighboring readings are used here to represent the radon conditions homeowners are likely to encounter. As the second leading cause of lung cancer in the U.S., radon warrants testing in every McDonough County home regardless of zone or a neighbor's results.

Radon FAQ for Colchester, IL

What EPA Radon Zone is Colchester in?

Colchester and the 62326 zip code are in McDonough County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

Why are radon readings shown from areas near Colchester?

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

Radon mitigation in Colchester 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 Colchester?

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.