National City, MI Radon Levels

Q: What EPA Radon Zone is National City in?

National City is in Iosco County, EPA Zone 3.

Q: Why are radon readings shown from areas near National City?

No homeowner radon tests have been submitted for National City yet, so readings from the closest cities and the Iosco County average are used as the best available indicator of local conditions. The EPA recommends testing every individual home.

Q: How much does radon mitigation cost in National City?

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

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

National City, MI Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Iosco County, MI

Zip Code 48748

This National City in Iosco County sits within Michigan's northern Lower Peninsula, where glacial deposits and sandy soils over sedimentary bedrock create variable radon conditions. Testing data for zip code 48748 is currently limited, making individual home assessment important for understanding local radon exposure patterns. The area's mix of seasonal cottages and year-round homes with different foundation types suggests testing should be considered for comprehensive radon evaluation.

8.00

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 8.00 pCi/L, based on 1 test from 1 nearby city. No readings have been submitted for National City 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+

National City, MI Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Need Radon Mitigation or Testing in National City?

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Radon Readings Near National City, MI

No homeowner tests have been submitted for National City 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
Gladwin	44.8 mi	8.00 pCi/L	1

Iosco County Radon Profile

Iosco County is classified as EPA Radon Zone 3, the lowest predicted-risk tier, with modeled indoor screening averages below 2 pCi/L. User-submitted readings are still sparse within Iosco 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 Iosco County.

Radon FAQ for National City, MI

What EPA Radon Zone is National City in?

National City and the 48748 zip code are in Iosco County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

Why are radon readings shown from areas near National City?

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

Radon mitigation in National City 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 National City?

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.