Thebes, IL Radon Levels

Q: What EPA Radon Zone is Thebes in?

Thebes is in Alexander County, EPA Zone 3.

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

No homeowner radon tests have been submitted for Thebes yet, so readings from the closest cities and the Alexander 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 Thebes?

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

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

Thebes, IL Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Alexander County, IL

Zip Code 62990

Situated in far southern Alexander County, Thebes sits in the Shawnee Hills region where sandstone and shale formations generally produce lower radon levels compared to northern Illinois. Testing data for this 62990 community is currently limited, though the underlying geology suggests moderate radon potential. Homeowners should consider professional assessment, as individual properties near limestone outcrops can still exceed EPA thresholds.

5.33

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 5.33 pCi/L, based on 3 tests from 3 nearby cities. No readings have been submitted for Thebes yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Thebes, 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 Thebes, IL

No homeowner tests have been submitted for Thebes 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
Murphysboro	38.3 mi	10.00 pCi/L	1
Marion	45.4 mi	5.00 pCi/L	1
Campbell Hill	48.9 mi	1.00 pCi/L	1

Alexander County Radon Profile

The EPA maps Alexander County as Radon Zone 3, the lowest predicted classification, with modeled indoor screening levels under 2 pCi/L. Direct test data for Alexander County remains limited, so the closest neighboring readings are used here to represent the radon conditions homeowners are likely to encounter. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Alexander County home regardless of zone or a neighbor's results.

Radon FAQ for Thebes, IL

What EPA Radon Zone is Thebes in?

Thebes and the 62990 zip code are in Alexander County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

Why are radon readings shown from areas near Thebes?

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

Radon mitigation in Thebes 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 Thebes?

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.