Old Monroe, MO Radon Levels

Q: What EPA Radon Zone is Old Monroe in?

Old Monroe is in Lincoln County, EPA Zone 2.

Q: How much does radon mitigation cost in Old Monroe?

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

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

Old Monroe, MO Radon Facts

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

County Lincoln County, MO

Zip Code 63369

Positioned in Lincoln County within the St. Louis metropolitan area along the Mississippi River corridor, Old Monroe sits on alluvial deposits over limestone bedrock. While specific radon testing data for zip code 63369 remains limited, the area's Zone 2 EPA classification indicates moderate radon potential. Homeowners should conduct testing, especially in properties with basement foundations common in this region.

8.50

pCi/L area average

Above EPA Action Level

Lincoln County average: 8.50 pCi/L, based on 4 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Old Monroe 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+

Old Monroe, MO Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Need Radon Mitigation or Testing in Old Monroe?

100% Free, No-Obligation Quotes
Matches You with State-Licensed Lincoln County Pros

1-800-299-3578 636-205-4618 (local) Toll-free · Mon–Fri 8am–6pm ET

Radon Readings Near Old Monroe, MO

No homeowner tests have been submitted for Old Monroe 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
Lake Saint Louis	9.7 mi	5.00 pCi/L	2
O Fallon	10.4 mi	7.75 pCi/L	4
Troy	10.9 mi	8.50 pCi/L	4
Saint Peters	13.6 mi	7.00 pCi/L	1
Saint Charles	16.5 mi	5.00 pCi/L	1
Chesterfield	23.1 mi	5.00 pCi/L	1
Hazelwood	24.5 mi	20.00 pCi/L	1
Ballwin	26.8 mi	4.00 pCi/L	1

Lincoln County Radon Profile

EPA mapping assigns Lincoln County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 1 city in Lincoln County average 8.50 pCi/L across 4 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Lincoln County home regardless of zone or a neighbor's results.

Radon FAQ for Old Monroe, MO

What EPA Radon Zone is Old Monroe in?

Old Monroe and the 63369 zip code are in Lincoln 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 Old Monroe?

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

Radon mitigation in Old Monroe 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 Old Monroe?

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.