Harsens Island, MI Radon Levels

Q: What EPA Radon Zone is Harsens Island in?

Harsens Island is in St Clair County, EPA Zone Unknown.

Q: How much does radon mitigation cost in Harsens Island?

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

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

Harsens Island, MI Radon Facts

EPA Radon Zone Unknown Unknown

County St Clair County, MI

Zip Code 48028

This unique St. Clair River island community in St Clair County sits on sandy deltaic soils that typically limit radon accumulation. The Detroit metro area's mix of seasonal cottages and year-round homes often feature minimal basements or crawl spaces. Though comprehensive testing data is unavailable, the island's sandy soils and water-surrounded location generally create lower radon risk compared to mainland Michigan communities.

8.33

pCi/L area average

Above EPA Action Level

St Clair County average: 8.33 pCi/L, based on 3 user-submitted tests across 3 cities in the county. No homeowner readings have been submitted for Harsens Island 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+

Harsens Island, 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 Harsens Island, MI

No homeowner tests have been submitted for Harsens Island 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
East China	13.4 mi	10.50 pCi/L	2
Macomb	17.1 mi	3.00 pCi/L	1
Clinton Township	17.5 mi	6.50 pCi/L	2
Harper Woods	20.2 mi	5.00 pCi/L	1
Richmond	20.6 mi	2.00 pCi/L	1
Sterling Heights	22.4 mi	7.00 pCi/L	1
Warren	22.9 mi	5.67 pCi/L	3
Washington	25.3 mi	5.00 pCi/L	2

St Clair County Radon Profile

St Clair County has not been assigned a definitive EPA radon zone, so the agency recommends that every home be tested regardless of predicted risk. Homeowner-submitted tests from 3 cities in St Clair County average 8.33 pCi/L across 3 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 St Clair County.

Radon FAQ for Harsens Island, MI

What EPA Radon Zone is Harsens Island in?

Harsens Island and the 48028 zip code are in St Clair County, which has an EPA assigned Radon Zone of Unknown. A zone of Unknown does not have sufficient data for classification.

Why are radon readings shown from areas near Harsens Island?

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

Radon mitigation in Harsens Island 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 Harsens Island?

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.