Lake Saint Louis, MO Radon Levels

Q: What is the average radon level in Lake Saint Louis, MO?

Based on 2 user-submitted tests, the average radon level is 5.00 pCi/L.

Q: What EPA Radon Zone is Lake Saint Louis in?

Lake Saint Louis is in St Charles County, EPA Zone Unknown.

Q: How much does radon mitigation cost in Lake Saint Louis?

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

Check local Lake Saint Louis radon levels and find certified testing and mitigation professionals to keep your home safe

Lake Saint Louis, MO Radon Facts

EPA Radon Zone Unknown Unknown

County St Charles County, MO

Zip Code 63367

Avg. User Level 5.00 pCi/L

User Tests 2

This St. Louis metro community in St Charles County shows an average radon level of 5.0 pCi/L based on 2 local tests, which exceeds the EPA's 4.0 action threshold. Built on Missouri's karst limestone terrain, the 63367 area's geology contributes to elevated radon potential in many homes. Residents should prioritize testing, especially in the community's predominant basement-equipped suburban housing.

5.00

pCi/L average

Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Lake Saint Louis, MO. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Lake Saint Louis, 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 Lake Saint Louis?

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

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

Lake Saint Louis, Missouri Radon Levels

User-submitted radon test readings from homes in the Lake Saint Louis area.

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	Lake Saint Louis, MO	21-50 Years	Full Basement	Jun 2024
6 pCi/L	Lake Saint Louis, MO	0-20 Years	Full Basement	May 2023

Have a radon test result for Lake Saint Louis? Submit your reading to help other homeowners.

St Charles County Radon Profile

A specific EPA radon zone has not been established for St Charles County, which is why testing is advised for all homes here irrespective of geology. Homeowner-submitted tests from 5 cities in St Charles County average 6.63 pCi/L across 8 tests — 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 St Charles County to test, as levels can differ between neighboring homes.

Radon FAQ for Lake Saint Louis, MO

What is the average radon level in Lake Saint Louis, MO?

Based on 2 user-submitted tests, the average radon level in Lake Saint Louis is 5.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Lake Saint Louis in?

Lake Saint Louis and the 63367 zip code are in St Charles County, which has an EPA assigned Radon Zone of Unknown. A zone of Unknown does not have sufficient data for classification.

How much does radon mitigation cost in Lake Saint Louis?

Radon mitigation in Lake Saint Louis 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 Lake Saint Louis?

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.

Radon Levels Near Lake Saint Louis, MO

User-submitted radon levels from the cities closest to Lake Saint Louis with recorded test data. Explore nearby communities to compare local readings.

City	Distance	Avg User Level	Submissions
O Fallon	2.7 mi	7.75 pCi/L	4
Saint Peters	8.8 mi	7.00 pCi/L	1
Saint Charles	12.3 mi	5.00 pCi/L	1
Chesterfield	15.5 mi	5.00 pCi/L	1
Troy	17.2 mi	8.50 pCi/L	4
Ballwin	19.1 mi	4.00 pCi/L	1
Labadie	19.5 mi	4.00 pCi/L	1
Hazelwood	22.6 mi	20.00 pCi/L	1