Ionia, MI Radon Levels

Q: What EPA Radon Zone is Ionia in?

Ionia is in Ionia County, EPA Zone 2.

Q: Why are radon readings shown from areas near Ionia?

No homeowner radon tests have been submitted for Ionia yet, so readings from the closest cities and the Ionia 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 Ionia?

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

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

Ionia, MI Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Ionia County, MI

Zip Code 48846

West Michigan's Ionia, county seat of Ionia County, sits on glacial outwash deposits and sandy soils typical of the Grand River valley region. Testing data for zip code 48846 within the Grand Rapids metro area remains limited. While Michigan's glacial deposits can produce variable radon levels, homeowners should test their properties, especially older homes with full basements common in this established agricultural community.

4.00

pCi/L area average

Above EPA Action Level

Ionia County average: 4.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Ionia 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+

Ionia, 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 Ionia, MI

No homeowner tests have been submitted for Ionia yet, so the closest user-submitted readings from neighboring communities are shown below. Radon varies by home — testing is the only way to know your level.

Radon Level	City	Distance	Home Age	Foundation	Submitted
4 pCi/L	Saranac, MI	7.5 mi	21-50 Years	Full Basement	Apr 2023
6 pCi/L	Sunfield, MI	15.6 mi	100+ Years	Full Basement	Dec 2025
9 pCi/L	Grand Ledge, MI	23.3 mi	100+ Years	Partial Basement	Aug 2019
5 pCi/L	Grand Ledge, MI	23.3 mi	0-20 Years	Full Basement	Sep 2016
5 pCi/L	Rockford, MI	24.1 mi	21-50 Years	—	Apr 2024
20 pCi/L	Dewitt, MI	26.8 mi	0-20 Years	Full Basement	Mar 2022
3 pCi/L	Grand Rapids, MI	29.1 mi	100+ Years	Full Basement	Jan 2020

Readings are drawn from the nearest cities with submitted data. Have a result for Ionia? Submit your reading to help your neighbors.

Ionia County Radon Profile

EPA mapping assigns Ionia County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 1 city in Ionia County average 4.00 pCi/L across 1 test — 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 Ionia County home regardless of zone or a neighbor's results.

Radon FAQ for Ionia, MI

What EPA Radon Zone is Ionia in?

Ionia and the 48846 zip code are in Ionia County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Ionia?

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

Radon mitigation in Ionia 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 Ionia?

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.

Radon Levels Near Ionia, MI

User-submitted radon levels from the cities closest to Ionia with recorded test data. Explore nearby communities to compare local readings.

City	Distance	Avg User Level	Submissions
Saranac	7.5 mi	4.00 pCi/L	1
Sunfield	15.6 mi	6.00 pCi/L	1
Grand Ledge	23.3 mi	7.00 pCi/L	2
Rockford	24.1 mi	5.00 pCi/L	1