Lake Saint Louis, MO Radon Mitigation and Testing

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.

Avg: 5.00 pCi/L

St Charles County

EPA Zone Unknown

2 user tests

Lake Saint Louis is located in St Charles County, Missouri. With 2 user-submitted readings averaging 5.00 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 63367 zip code.

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.

Lake Saint Louis, MO Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

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.

Lake Saint Louis Radon Facts

Key details about the radon risk profile for Lake Saint Louis and the 63367 zip code area.

EPA Radon Zone

Unknown

County

St Charles County, MO

Zip Code

63367

Predicted Screening Level

Unknown

Avg. User Submitted Level

5.00 pCi/L

User Tests Submitted

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

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.

Most Active Radon Markets in Missouri

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Troy	8.50 pCi/L	4
Lees Summit	7.00 pCi/L	3
Columbia	3.00 pCi/L	2
House Springs	7.00 pCi/L	1
Kansas City	7.00 pCi/L	1
Springfield	7.00 pCi/L	1
Independence	5.00 pCi/L	1
Wentzville	No submissions	0