Thornton, IL Radon Levels

Q: What EPA Radon Zone is Thornton in?

Thornton is in Cook County, EPA Zone 2.

Q: How much does radon mitigation cost in Thornton?

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

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

Thornton, IL Radon Facts

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

County Cook County, IL

Zip Code 60476

Positioned in Cook County within the southern reaches of the Chicago metro area, Thornton sits over glacial till deposits that create favorable conditions for radon production and migration. The village's housing stock includes both older homes from the early 1900s and postwar developments, most featuring full basements standard throughout northern Illinois. With testing data currently limited for zip code 60476, residents should prioritize professional radon testing given the region's geological radon potential.

6.44

pCi/L area average

Above EPA Action Level

Cook County average: 6.44 pCi/L, based on 82 user-submitted tests across 40 cities in the county. No homeowner readings have been submitted for Thornton 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+

Thornton, 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 Thornton, IL

No homeowner tests have been submitted for Thornton 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
5 pCi/L	Flossmoor, IL	4.5 mi	100+ Years	Full Basement	Feb 2024
4 pCi/L	Blue Island, IL	7.0 mi	—	Full Basement	Nov 2020
15 pCi/L	Matteson, IL	8.1 mi	21-50 Years	Full Basement	May 2021
5 pCi/L	Richton Park, IL	8.7 mi	0-20 Years	Full Basement	Jul 2024
1 pCi/L	Richton Park, IL	8.7 mi	21-50 Years	No Basement/All Slab	Dec 2020
15 pCi/L	Crete, IL	9.2 mi	21-50 Years	Partial Basement	Oct 2020
7 pCi/L	Tinley Park, IL	10.9 mi	0-20 Years	Full Basement	May 2023
8 pCi/L	Tinley Park, IL	10.9 mi	21-50 Years	Partial Basement	Sep 2020

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

Cook County Radon Profile

Cook County is mapped as EPA Radon Zone 2, where the local geology is predicted to produce moderate indoor screening levels between 2 and 4 pCi/L. Homeowner-submitted tests from 40 cities in Cook County average 6.44 pCi/L across 82 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. 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 Cook County.

Radon FAQ for Thornton, IL

What EPA Radon Zone is Thornton in?

Thornton and the 60476 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.

Why are radon readings shown from areas near Thornton?

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

Radon mitigation in Thornton 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 Thornton?

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 Thornton, IL

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

City	Distance	Avg User Level	Submissions
Flossmoor	4.5 mi	5.00 pCi/L	1
Blue Island	7.0 mi	4.00 pCi/L	1
Matteson	8.1 mi	15.00 pCi/L	1
Richton Park	8.7 mi	3.00 pCi/L	2
Crete	9.2 mi	15.00 pCi/L	1
Tinley Park	10.9 mi	7.67 pCi/L	3
Palos Heights	11.4 mi	5.00 pCi/L	1
Orland Park	13.6 mi	7.00 pCi/L	3