Clark, MO Radon Mitigation and Testing

Q: What EPA Radon Zone is Clark in?

Clark is in Randolph County, EPA Zone 2.

Q: How much does radon mitigation cost in Clark?

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

Randolph County

EPA Zone 2

Within the Columbia Metro area, this Randolph County community sits on Missouri's prairie geology that creates EPA Zone 2 radon conditions. Testing data for zip code 65243 remains limited, though central Missouri's limestone bedrock and glacial drift soils can produce variable radon levels across individual properties. Homeowners should prioritize testing, particularly those with basement foundations typical of the region's residential construction patterns.

Clark, MO Radon Mitigation

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

Clark, MO Radon Testing

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

Clark Radon Facts

Key details about the radon risk profile for Clark and the 65243 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Randolph County, MO

Zip Code

65243

Predicted Screening Level

2–4 pCi/L (Zone 2)

Clark and the 65243 zip code are located in Randolph County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Clark, MO

What EPA Radon Zone is Clark in?

Clark and the 65243 zip code are in Randolph 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.

How much does radon mitigation cost in Clark?

Radon mitigation in Clark 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 Clark?

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