Altona, IL Radon Levels

Q: What EPA Radon Zone is Altona in?

Altona is in Knox County, EPA Zone 1.

Q: Why are radon readings shown from areas near Altona?

No homeowner radon tests have been submitted for Altona yet, so readings from the closest cities and the Knox County average are used as the best available indicator of local conditions. The EPA recommends testing every individual home.

Q: How much does radon mitigation cost in Altona?

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

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

Altona, IL Radon Facts

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

County Knox County, IL

Zip Code 61414

Small-town Knox County sits within the glacial moraine region of western Illinois, where deep glacial deposits over limestone bedrock create conditions favorable for radon accumulation. Though testing data is limited for the 61414 zip code area, the geological setting suggests homeowners should prioritize radon testing.

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 Altona 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+

Altona, 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 Altona, IL

No homeowner tests have been submitted for Altona 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
Kewanee	15.0 mi	8.00 pCi/L	1
Knoxville	15.5 mi	8.00 pCi/L	1
New Windsor	16.7 mi	6.00 pCi/L	1
Orion	20.9 mi	4.00 pCi/L	1
Annawan	23.5 mi	10.00 pCi/L	1
Geneseo	24.6 mi	6.00 pCi/L	1
Coal Valley	27.3 mi	12.00 pCi/L	1
Monmouth	28.9 mi	8.00 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 Altona, IL

What EPA Radon Zone is Altona in?

Altona and the 61414 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 Altona?

No homeowner radon tests have been submitted for Altona 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 Altona 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 Altona?

Radon mitigation in Altona 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 Altona?

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.