Saint Augustine, IL Radon Levels

Q: What EPA Radon Zone is Saint Augustine in?

Saint Augustine is in Knox County, EPA Zone 1.

Q: How much does radon mitigation cost in Saint Augustine?

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

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

Saint Augustine, IL Radon Facts

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

County Knox County, IL

Zip Code 61474

Rural Saint Augustine in Knox County sits in western Illinois where deep glacial deposits over Pennsylvanian limestone create moderate radon potential. With testing data unavailable for zip code 61474, homeowners should test their properties to establish baseline radon levels. The area's agricultural character includes older farmsteads and newer rural homes, both of which may be affected by the region's geological radon sources.

8.00

pCi/L area average

Above EPA Action Level

Knox County average: 8.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Saint Augustine 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+

Saint Augustine, 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 Saint Augustine, IL

No homeowner tests have been submitted for Saint Augustine yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Knoxville	13.5 mi	8.00 pCi/L	1
Monmouth	18.7 mi	8.00 pCi/L	1
Cuba	19.0 mi	6.00 pCi/L	1
Stronghurst	28.6 mi	13.00 pCi/L	2
New Windsor	32.7 mi	6.00 pCi/L	1
Mapleton	35.6 mi	8.00 pCi/L	1
Dunlap	39.5 mi	7.00 pCi/L	1
Peoria	39.7 mi	5.00 pCi/L	1

Knox County Radon Profile

The bedrock and soils beneath Knox County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 1 city in Knox County average 8.00 pCi/L across 1 test — 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 Knox County.

Radon FAQ for Saint Augustine, IL

What EPA Radon Zone is Saint Augustine in?

Saint Augustine and the 61474 zip code are in Knox 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.

Why are radon readings shown from areas near Saint Augustine?

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

Radon mitigation in Saint Augustine 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 Saint Augustine?

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.