Williamsville, IL Radon Levels

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

Based on 1 user-submitted tests, the average radon level is 1.00 pCi/L.

Q: What EPA Radon Zone is Williamsville in?

Williamsville is in Sangamon County, EPA Zone 1.

Q: How much does radon mitigation cost in Williamsville?

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

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

Williamsville, IL Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Sangamon County, IL

Zip Code 62693

Avg. User Level 1.00 pCi/L

User Tests 1

Based in Sangamon County within the Springfield Metro area, Williamsville recorded an average radon level of 1.0 pCi/L from limited testing data. While this reading falls well within EPA recommended ranges, the glacial moraine deposits and underlying limestone bedrock common to central Illinois can create variable radon conditions across different properties. Residents should still conduct individual testing, as local soil conditions and home construction factors can influence radon accumulation regardless of community averages.

1.00

pCi/L average

Below EPA Action Level

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

4.0 EPA

10+

Williamsville, IL Radon Mitigation

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

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Williamsville, Illinois Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
1 pCi/L	Williamsville, IL	21-50 Years	Full Basement	Aug 2018

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

Sangamon County Radon Profile

Sangamon County falls in EPA Radon Zone 1, meaning the local uranium-bearing geology is predicted to drive average indoor radon screening levels above the EPA's 4 pCi/L action threshold. Homeowner-submitted tests from 5 cities in Sangamon County average 5.00 pCi/L across 6 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Sangamon County to test, as levels can differ between neighboring homes.

Radon FAQ for Williamsville, IL

What is the average radon level in Williamsville, IL?

Based on 1 user-submitted test, the average radon level in Williamsville is 1.00 pCi/L. This is below the EPA's recommended action level of 4.0 pCi/L. However, we recommend all homes be tested regardless of your neighbor's results.

What EPA Radon Zone is Williamsville in?

Williamsville and the 62693 zip code are in Sangamon 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 Williamsville?

Radon mitigation in Williamsville 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 Williamsville?

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 Williamsville, IL

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

City	Distance	Avg User Level	Submissions
Springfield	12.6 mi	6.50 pCi/L	2
Lincolns New Salem	13.7 mi	8.00 pCi/L	1
Chatham	21.2 mi	3.00 pCi/L	1
Auburn	27.1 mi	6.00 pCi/L	1
Divernon	27.3 mi	7.00 pCi/L	1