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Chicago Metro, IL Radon Information

The Chicago Metro metropolitan area in Illinois has a regional average radon level of 7.3 pCi/L based on 280 user-submitted tests. This exceeds the EPA’s recommended action level of 4.0 pCi/L, meaning radon testing and professional mitigation should be a priority for homeowners across the region.

Radon is a naturally occurring radioactive gas produced by the decay of uranium in soil and bedrock. In the Chicago Metro area, local geology and common residential construction—particularly homes with basements and crawlspaces—allow radon to seep indoors and accumulate to dangerous concentrations. Particularly high readings have been recorded in communities like Buffalo Grove, Crystal Lake, New Lenox, where professional radon testing and mitigation services are strongly recommended.

Whether you are buying a home, selling a property, or simply want to protect your family, a professional radon test is the only way to know your home’s levels. If elevated radon is found, a licensed mitigation contractor can install a sub-slab depressurization system—typically in one day—to reduce levels by up to 99%. Request a free radon mitigation quote

The regional average is 7.3 pCi/L — above the EPA action level of 4.0 pCi/L. Testing and mitigation are strongly recommended.
7.3
Avg. pCi/L
120
Cities
280
User Tests
Zone 1
EPA Rating
Above EPA Action Level
Below EPA Action Level

Top 5 Radon Hotspots in the Chicago Metro Area

Cities with the highest average user-submitted radon readings in the Chicago Metro metropolitan area.

Rank City Avg. Radon Level Tests
1 Buffalo Grove
6.10 pCi/L
10
2 Crystal Lake
7.30 pCi/L
8
3 New Lenox
10.10 pCi/L
7
4 Park Ridge
6.60 pCi/L
7
5 Lake Zurich
6.00 pCi/L
7

Other Metro Areas in Illinois

Explore radon data for other metropolitan regions across the state.

Bloomington Metro
View radon data
Champaign Metro
View radon data
Davenport Metro
View radon data
Peoria Metro
View radon data
Rockford Metro
View radon data
Springfield Metro
View radon data
St. Louis Metro
View radon data

Cities in the Chicago Metro Area

120 cities and towns in the Chicago Metro metropolitan area with user-submitted radon data.

120 cities
Saint Charles Zone 1
18.0 pCi/L
Above EPA action level
Sycamore Zone 1
16.0 pCi/L
Above EPA action level
Lemont Zone 1
16.0 pCi/L
Above EPA action level
Crete Zone 1
15.0 pCi/L
Above EPA action level
Matteson Zone 1
15.0 pCi/L
Above EPA action level
Romeoville Zone 1
15.0 pCi/L
Above EPA action level
Downers Grove Zone 1
14.0 pCi/L
Above EPA action level
Dundee Zone 1
14.0 pCi/L
Above EPA action level
Spring Grove Zone 1
14.0 pCi/L
Above EPA action level
Kingston Zone 1
13.0 pCi/L
Above EPA action level
Rochelle Zone 1
13.0 pCi/L
Above EPA action level
Lockport Zone 1
12.5 pCi/L
Above EPA action level
Villa Park Zone 1
12.5 pCi/L
Above EPA action level
Woodstock Zone 1
12.5 pCi/L
Above EPA action level
Manteno Zone 1
11.7 pCi/L
Above EPA action level
Elgin Zone 1
11.5 pCi/L
Above EPA action level
Mchenry Zone 1
11.0 pCi/L
Above EPA action level
Chicago Zone 1
11.0 pCi/L
Above EPA action level
Earlville Zone 1
11.0 pCi/L
Above EPA action level
Glendale Heights Zone 1
11.0 pCi/L
Above EPA action level
Minooka Zone 1
11.0 pCi/L
Above EPA action level
Newark Zone 1
11.0 pCi/L
Above EPA action level
Warrenville Zone 1
10.5 pCi/L
Above EPA action level
New Lenox Zone 1
10.1 pCi/L
Above EPA action level
Highland Park Zone 1
10.0 pCi/L
Above EPA action level
Fox River Grove Zone 1
10.0 pCi/L
Above EPA action level
Lake Forest Zone 1
10.0 pCi/L
Above EPA action level
Oak Brook Zone 1
10.0 pCi/L
Above EPA action level
Plano Zone 1
10.0 pCi/L
Above EPA action level
Prospect Heights Zone 1
10.0 pCi/L
Above EPA action level
Wadsworth Zone 1
9.5 pCi/L
Above EPA action level
Libertyville Zone 1
9.3 pCi/L
Above EPA action level
Glen Ellyn Zone 1
9.0 pCi/L
Above EPA action level
Bolingbrook Zone 1
9.0 pCi/L
Above EPA action level
Evanston Zone 1
9.0 pCi/L
Above EPA action level
Dekalb Zone 1
8.8 pCi/L
Above EPA action level
Montgomery Zone 1
8.5 pCi/L
Above EPA action level
Mundelein Zone 1
8.0 pCi/L
Above EPA action level
Harvard Zone 1
8.0 pCi/L
Above EPA action level
Manhattan Zone 1
8.0 pCi/L
Above EPA action level
Riverside Zone 1
8.0 pCi/L
Above EPA action level
Palatine Zone 1
7.8 pCi/L
Above EPA action level
Round Lake Zone 1
7.8 pCi/L
Above EPA action level
Tinley Park Zone 1
7.7 pCi/L
Above EPA action level
South Elgin Zone 1
7.5 pCi/L
Above EPA action level
Crystal Lake Zone 1
7.3 pCi/L
Above EPA action level
Lisle Zone 1
7.3 pCi/L
Above EPA action level
Antioch Zone 1
7.0 pCi/L
Above EPA action level
Elk Grove Village Zone 1
7.0 pCi/L
Above EPA action level
Orland Park Zone 1
7.0 pCi/L
Above EPA action level
Vernon Hills Zone 1
7.0 pCi/L
Above EPA action level
Forest Park Zone 1
7.0 pCi/L
Above EPA action level
Geneva Zone 1
7.0 pCi/L
Above EPA action level
North Aurora Zone 1
7.0 pCi/L
Above EPA action level
Dwight Zone 1
7.0 pCi/L
Above EPA action level
Sugar Grove Zone 1
7.0 pCi/L
Above EPA action level
Western Springs Zone 1
7.0 pCi/L
Above EPA action level
Aurora Zone 1
6.8 pCi/L
Above EPA action level
Hoffman Estates Zone 1
6.8 pCi/L
Above EPA action level
Joliet Zone 1
6.7 pCi/L
Above EPA action level
Wauconda Zone 1
6.7 pCi/L
Above EPA action level
Park Ridge Zone 1
6.6 pCi/L
Above EPA action level
Lake In The Hills Zone 1
6.5 pCi/L
Above EPA action level
Lombard Zone 1
6.3 pCi/L
Above EPA action level
Naperville Zone 1
6.3 pCi/L
Above EPA action level
Plainfield Zone 1
6.3 pCi/L
Above EPA action level
Arlington Heights Zone 1
6.2 pCi/L
Above EPA action level
Northbrook Zone 1
6.2 pCi/L
Above EPA action level
Buffalo Grove Zone 1
6.1 pCi/L
Above EPA action level
Lake Zurich Zone 1
6.0 pCi/L
Above EPA action level
Barrington Zone 1
6.0 pCi/L
Above EPA action level
Cary Zone 1
6.0 pCi/L
Above EPA action level
Rolling Meadows Zone 1
6.0 pCi/L
Above EPA action level
Yorkville Zone 1
6.0 pCi/L
Above EPA action level
Carol Stream Zone 1
6.0 pCi/L
Above EPA action level
Crest Hill Zone 1
6.0 pCi/L
Above EPA action level
Lincolnshire Zone 1
6.0 pCi/L
Above EPA action level
Roselle Zone 1
6.0 pCi/L
Above EPA action level
Willowbrook Zone 1
6.0 pCi/L
Above EPA action level
Wilmette Zone 1
6.0 pCi/L
Above EPA action level
Huntley Zone 1
5.8 pCi/L
Above EPA action level
Winfield Zone 1
5.8 pCi/L
Above EPA action level
Mokena Zone 1
5.7 pCi/L
Above EPA action level
Marengo Zone 1
5.5 pCi/L
Above EPA action level
Willow Springs Zone 1
5.5 pCi/L
Above EPA action level
Mount Prospect Zone 1
5.3 pCi/L
Above EPA action level
Oak Park Zone 1
5.3 pCi/L
Above EPA action level
Grayslake Zone 1
5.0 pCi/L
Above EPA action level
Hanover Park Zone 1
5.0 pCi/L
Above EPA action level
Algonquin Zone 1
5.0 pCi/L
Above EPA action level
Gurnee Zone 1
5.0 pCi/L
Above EPA action level
Wheeling Zone 1
5.0 pCi/L
Above EPA action level
Berwyn Zone 1
5.0 pCi/L
Above EPA action level
Cortland Zone 1
5.0 pCi/L
Above EPA action level
Darien Zone 1
5.0 pCi/L
Above EPA action level
Flossmoor Zone 1
5.0 pCi/L
Above EPA action level
Fox Lake Zone 1
5.0 pCi/L
Above EPA action level
Hinsdale Zone 1
5.0 pCi/L
Above EPA action level
Palos Heights Zone 1
5.0 pCi/L
Above EPA action level
Streamwood Zone 1
5.0 pCi/L
Above EPA action level
Woodridge Zone 1
5.0 pCi/L
Above EPA action level
Glenview Zone 1
4.3 pCi/L
Above EPA action level
Homer Glen Zone 1
4.3 pCi/L
Above EPA action level
Schaumburg Zone 1
4.3 pCi/L
Above EPA action level
Bartlett Zone 3
4.0 pCi/L
Below EPA action level
Addison Zone 3
4.0 pCi/L
Below EPA action level
Blue Island Zone 3
4.0 pCi/L
Below EPA action level
Deerfield Zone 3
4.0 pCi/L
Below EPA action level
Elmhurst Zone 3
4.0 pCi/L
Below EPA action level
Lake Bluff Zone 3
4.0 pCi/L
Below EPA action level
River Forest Zone 3
4.0 pCi/L
Below EPA action level
Shorewood Zone 3
4.0 pCi/L
Below EPA action level
Waukegan Zone 3
4.0 pCi/L
Below EPA action level
Westchester Zone 3
4.0 pCi/L
Below EPA action level
Westmont Zone 3
4.0 pCi/L
Below EPA action level
Wheaton Zone 3
4.0 pCi/L
Below EPA action level
Wood Dale Zone 3
4.0 pCi/L
Below EPA action level
Zion Zone 3
4.0 pCi/L
Below EPA action level
Richton Park Zone 3
3.0 pCi/L
Below EPA action level
Burbank Zone 3
2.0 pCi/L
Below EPA action level

Radon Mitigation Professionals Serving the Chicago Metro Area

Licensed contractors who serve this metro area.

Company
Accurate Radon
Ace Inspection Service
Bee Sure Home Inspection Services LLC
Consulting Solutions Inc
Dupage Radon Contractors
DuPage Radon Testing Inc
Elliott & Associates
GlobeSpec
Home Inspector - Consultants Inc
JBL Radon Gas Detection
John A. Raber & Assoc. Inc
Kinightic Energy
Landauer Inc
Northeast Illinois Radon Testing
Nova Consulting Inc
Professional Radon Systems Inc
Progressive Building Inspections Inc
Quality Radon Testing
Radon Management Systems Inc
Radon Professional Services
Radon Testers Inc
Radon-By-Regency
Radovent LLC
Reliable Radon Inspections Inc
RKC Inspections
RSSI
SafeHouse Radon Testing
VSI Radon Reduction Corp.
White Glove Building Inspections Inc

Frequently Asked Questions about Radon in the Chicago Metro Area

Common questions about radon testing, mitigation costs, and health risks for homeowners in the Chicago Metro metropolitan area.

Why are radon levels so high in the Chicago Metro area?
Radon levels in the Chicago Metro area are driven by the local soil and bedrock composition, which contains naturally occurring uranium. As uranium decays, it produces radon gas that migrates upward through the soil and enters homes through foundation cracks, sump pits, and gaps around pipes. Homes with basements and crawlspaces are especially susceptible because these below-grade spaces are in direct contact with the soil where radon concentrations are highest.
How much does radon mitigation cost in Chicago Metro?
Professional radon mitigation in the Chicago Metro metropolitan area typically costs between $800 and $2,500, depending on the size and construction of your home. The most common approach is an active sub-slab depressurization system, which a certified contractor can usually install in a single day. Ongoing energy costs for the mitigation fan are minimal—roughly $5–$10 per month—and most systems reduce radon levels by 90% or more.
Are landlords in Illinois required to test for radon?
Radon testing and disclosure requirements vary by state and municipality. Some Illinois jurisdictions require landlords to disclose known radon levels or test results, while others have no mandate. Regardless of local law, the EPA recommends radon testing for all residential properties—including rentals—since radon is the second leading cause of lung cancer in the United States.
Can I sell a house with high radon levels in the Chicago Metro area?
Yes. High radon levels do not prevent a home sale, but buyers in the Chicago Metro market routinely request radon testing during the inspection period. If levels exceed 4.0 pCi/L, the buyer may negotiate for the seller to install a mitigation system before closing. Having a radon mitigation system already in place can actually be a selling point, demonstrating proactive home maintenance and providing documented proof of safe indoor air quality.