Henley, MO Radon Levels

Q: What EPA Radon Zone is Henley in?

Henley is in Cole County, EPA Zone 2.

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

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

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

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

Henley, MO Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Cole County, MO

Zip Code 65040

Part of the Jefferson City Metro area in Cole County, Henley currently has insufficient radon testing data to determine local exposure patterns. Central Missouri's rolling hills over limestone bedrock create geological conditions that can support radon gas migration into residential structures. The combination of natural geology and varied foundation types in this region makes individual home testing the most reliable method for assessing radon risk.

6.00

pCi/L area average

Above EPA Action Level

Cole County average: 6.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Henley 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+

Henley, MO 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 Henley, MO

No homeowner tests have been submitted for Henley 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
Jefferson City	16.4 mi	6.00 pCi/L	1
Holts Summit	22.8 mi	4.00 pCi/L	1
Gravois Mills	27.8 mi	7.00 pCi/L	1
Sunrise Beach	28.3 mi	5.00 pCi/L	2
Climax Springs	37.1 mi	2.00 pCi/L	1
Saint Robert	37.2 mi	7.00 pCi/L	1
Waynesville	40.3 mi	7.00 pCi/L	2
Rolla	41.0 mi	4.50 pCi/L	2

Cole County Radon Profile

The soils and bedrock of Cole County place it in EPA Radon Zone 2, a moderate-risk classification with predicted indoor averages of 2 to 4 pCi/L. Homeowner-submitted tests from 1 city in Cole County average 6.00 pCi/L across 1 test — 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 Cole County to test, as levels can differ between neighboring homes.

Radon FAQ for Henley, MO

What EPA Radon Zone is Henley in?

Henley and the 65040 zip code are in Cole County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Henley?

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

Radon mitigation in Henley 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 Henley?

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.