Plymouth, IL Radon Levels

Q: What EPA Radon Zone is Plymouth in?

Plymouth is in McDonough County, EPA Zone 1.

Q: How much does radon mitigation cost in Plymouth?

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

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

Plymouth, IL Radon Facts

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

County McDonough County, IL

Zip Code 62367

Plymouth lies in western Illinois's McDonough County agricultural region (zip code 62367). Though local testing data remains limited, the area's prairie soils over limestone bedrock can contribute to radon accumulation in homes. Illinois residents should test their homes regularly, as geological conditions throughout the state often support elevated radon levels.

8.50

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 8.50 pCi/L, based on 8 tests from 6 nearby cities. No readings have been submitted for Plymouth 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+

Plymouth, 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 Plymouth, IL

No homeowner tests have been submitted for Plymouth 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	19.1 mi	9.00 pCi/L	1
Stronghurst	29.7 mi	13.00 pCi/L	2
Quincy	32.7 mi	7.50 pCi/L	2
Cuba	43.1 mi	6.00 pCi/L	1
Monmouth	43.9 mi	8.00 pCi/L	1
Griggsville	44.4 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 Plymouth, IL

What EPA Radon Zone is Plymouth in?

Plymouth and the 62367 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 Plymouth?

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

Radon mitigation in Plymouth 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 Plymouth?

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.