Monticello, MO Radon Levels

Q: What EPA Radon Zone is Monticello in?

Monticello is in Lewis County, EPA Zone 2.

Q: How much does radon mitigation cost in Monticello?

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

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

Monticello, MO Radon Facts

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

County Lewis County, MO

Zip Code 63457

Rural Lewis County in northeast Missouri sits over limestone bedrock formations that can produce variable radon levels depending on local geology. The area's mix of older farmhouses and manufactured homes presents different radon entry pathways and accumulation patterns. With limited testing data for zip code 63457, residents should conduct individual radon tests to assess their specific exposure risk.

6.67

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 6.67 pCi/L, based on 3 tests from 2 nearby cities. No readings have been submitted for Monticello 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+

Monticello, 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 Monticello, MO

No homeowner tests have been submitted for Monticello 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
Palmyra	24.4 mi	8.00 pCi/L	1
Hannibal	33.4 mi	6.00 pCi/L	2

Lewis County Radon Profile

The soils and bedrock of Lewis County place it in EPA Radon Zone 2, a moderate-risk classification with predicted indoor averages of 2 to 4 pCi/L. Few homeowner tests have been logged inside Lewis County so far, which is why this page draws on the nearest recorded readings to illustrate regional radon levels. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Lewis County to test, as levels can differ between neighboring homes.

Radon FAQ for Monticello, MO

What EPA Radon Zone is Monticello in?

Monticello and the 63457 zip code are in Lewis 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 Monticello?

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

Radon mitigation in Monticello 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 Monticello?

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.