Potosi, MO Radon Mitigation and Testing

Q: What EPA Radon Zone is Potosi in?

Potosi is in Washington County, EPA Zone Unknown.

Q: How much does radon mitigation cost in Potosi?

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

Washington County

EPA Zone Unknown

Potosi sits in Missouri's historic lead belt within Washington County, where Precambrian granite and rhyolite bedrock can contribute to elevated radon levels. Testing data for zip code 63664 remains limited, though the area's unique geology warrants careful attention from homeowners. The community's mix of older mining-era housing and newer construction creates varied foundation types that may influence radon entry rates.

Potosi, MO Radon Mitigation

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

Potosi, MO Radon Testing

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

Potosi Radon Facts

Key details about the radon risk profile for Potosi and the 63664 zip code area.

EPA Radon Zone

Unknown

County

Washington County, MO

Zip Code

63664

Predicted Screening Level

Unknown

Potosi and the 63664 zip code are located in Washington 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 Potosi, MO

What EPA Radon Zone is Potosi in?

Potosi and the 63664 zip code are in Washington 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 Potosi?

Radon mitigation in Potosi 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 Potosi?

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