Marseilles, IL Radon Mitigation and Testing

Q: What is the average radon level in Marseilles, IL?

Based on 1 user-submitted tests, the average radon level is 9.00 pCi/L.

Q: What EPA Radon Zone is Marseilles in?

Marseilles is in La Salle County, EPA Zone 1.

Q: How much does radon mitigation cost in Marseilles?

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

Avg: 9.00 pCi/L

La Salle County

EPA Zone 1

1 user test

Marseilles is located in La Salle County, Illinois. With 1 user-submitted readings averaging 9.00 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 61341 zip code.

9.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Marseilles, IL. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Marseilles, IL Radon Mitigation

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

Marseilles, IL Radon Testing

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

Marseilles, Illinois Radon Levels

User-submitted radon test readings from homes in the Marseilles area.

Radon Level	City	Home Age	Foundation	Submitted
9 pCi/L	Marseilles, IL	21-50 Years	Partial Basement	Oct 2017

Have a radon test result for Marseilles? Submit your reading to help other homeowners.

Marseilles Radon Facts

Key details about the radon risk profile for Marseilles and the 61341 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

La Salle County, IL

Zip Code

61341

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

9.00 pCi/L

User Tests Submitted

Marseilles and the 61341 zip code are located in La Salle County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Marseilles, IL

What is the average radon level in Marseilles, IL?

Based on 1 user-submitted test, the average radon level in Marseilles is 9.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Marseilles in?

Marseilles and the 61341 zip code are in La Salle County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Marseilles?

Radon mitigation in Marseilles 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 Marseilles?

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