Markham, IL Radon Mitigation and Testing

Q: What EPA Radon Zone is Markham in?

Markham is in Cook County, EPA Zone 2.

Q: How much does radon mitigation cost in Markham?

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

Cook County

EPA Zone 2

Located in Cook County along the southern suburban reaches of the Chicago metro, Markham sits on glacial till deposits from the Wisconsin glaciation that create soil conditions highly favorable for radon gas production. The community's housing stock consists predominantly of single-family homes built between the 1950s and 1990s, most with full poured-concrete or block basements where radon can accumulate. While radon testing data for zip code 60428 is currently limited, homeowners are strongly encouraged to test their properties given the area's geological characteristics.

Markham, IL Radon Mitigation

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

Markham, IL Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Markham Radon Facts

Key details about the radon risk profile for Markham and the 60428 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Cook County, IL

Zip Code

60428

Predicted Screening Level

2–4 pCi/L (Zone 2)

Markham and the 60428 zip code are located in Cook County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Markham, IL

What EPA Radon Zone is Markham in?

Markham and the 60428 zip code are in Cook 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.

How much does radon mitigation cost in Markham?

Radon mitigation in Markham 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 Markham?

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.

Most Active Radon Markets in Illinois

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Buffalo Grove	6.10 pCi/L	10
Crystal Lake	7.25 pCi/L	8
Lake Zurich	6.00 pCi/L	7
Grayslake	5.00 pCi/L	7
New Lenox	10.17 pCi/L	6
Park Ridge	7.00 pCi/L	6
Arlington Heights	6.17 pCi/L	6
Waterloo	9.20 pCi/L	5
Palatine	7.80 pCi/L	5
Round Lake	7.80 pCi/L	5
Northbrook	6.20 pCi/L	5
Mchenry	11.00 pCi/L	4
Dekalb	8.75 pCi/L	4
Columbia	8.00 pCi/L	4
Lisle	7.25 pCi/L	4
Normal	7.25 pCi/L	4
Antioch	7.00 pCi/L	4
Elk Grove Village	7.00 pCi/L	4
Aurora	6.75 pCi/L	4
Hoffman Estates	6.75 pCi/L	4