Chelsea, MI Radon Levels

Q: What EPA Radon Zone is Chelsea in?

Chelsea is in Washtenaw County, EPA Zone 1.

Q: How much does radon mitigation cost in Chelsea?

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

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

Chelsea, MI Radon Facts

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

County Washtenaw County, MI

Zip Code 48118

Located in Washtenaw County within the Ann Arbor Metro area, Chelsea sits over glacial deposits that can influence radon levels throughout southeastern Michigan. Limited testing data exists for the 48118 zip code, making individual property testing crucial for homeowners. The community's mix of historic and modern homes, many with full basements, warrants professional radon assessment regardless of construction era.

6.29

pCi/L area average

Above EPA Action Level

Washtenaw County average: 6.29 pCi/L, based on 7 user-submitted tests across 4 cities in the county. No homeowner readings have been submitted for Chelsea 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+

Chelsea, MI 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 Chelsea, MI

No homeowner tests have been submitted for Chelsea 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
Dexter	7.3 mi	4.00 pCi/L	1
Grass Lake	8.9 mi	6.00 pCi/L	1
Pinckney	11.5 mi	7.33 pCi/L	3
Munith	11.5 mi	3.00 pCi/L	1
Ann Arbor	15.7 mi	5.00 pCi/L	1
Saline	16.4 mi	1.00 pCi/L	1
Pleasant Lake	16.5 mi	13.00 pCi/L	1
Clinton	18.3 mi	6.00 pCi/L	1

Washtenaw County Radon Profile

Because of its underlying geology, Washtenaw County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 4 cities in Washtenaw County average 6.29 pCi/L across 7 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Washtenaw County home regardless of zone or a neighbor's results.

Radon FAQ for Chelsea, MI

What EPA Radon Zone is Chelsea in?

Chelsea and the 48118 zip code are in Washtenaw 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 Chelsea?

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

Radon mitigation in Chelsea 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 Chelsea?

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.