Union, IL Radon Levels

Q: What EPA Radon Zone is Union in?

Union is in McHenry County, EPA Zone 2.

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

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

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

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

Union, IL Radon Facts

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

County McHenry County, IL

Zip Code 60180

Positioned in McHenry County's northwest suburban Chicago corridor, Union sits on glacial till deposits that create favorable conditions for radon gas production throughout northern Illinois. Testing data for this rural community is currently limited, making local radon pattern assessment challenging. Given the area's EPA Zone 2 classification and geological characteristics, homeowners in zip code 60180 should consider radon testing.

7.73

pCi/L area average

Above EPA Action Level

McHenry County average: 7.73 pCi/L, based on 33 user-submitted tests across 11 cities in the county. No homeowner readings have been submitted for Union 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+

Union, 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 Union, IL

No homeowner tests have been submitted for Union 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
Marengo	4.7 mi	5.50 pCi/L	2
Huntley	5.7 mi	5.75 pCi/L	4
Woodstock	8.6 mi	12.50 pCi/L	2
Lake In The Hills	10.3 mi	6.50 pCi/L	4
Crystal Lake	10.6 mi	7.25 pCi/L	8
Algonquin	11.8 mi	5.00 pCi/L	2
Kingston	14.3 mi	13.00 pCi/L	1
Dundee	14.5 mi	14.00 pCi/L	1

McHenry County Radon Profile

EPA mapping assigns McHenry 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 11 cities in McHenry County average 7.73 pCi/L across 33 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 McHenry County home regardless of zone or a neighbor's results.

Radon FAQ for Union, IL

What EPA Radon Zone is Union in?

Union and the 60180 zip code are in McHenry 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 Union?

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

Radon mitigation in Union 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 Union?

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.