Clark, MO Radon Levels

Q: What EPA Radon Zone is Clark in?

Clark is in Randolph County, EPA Zone 2.

Q: Why are radon readings shown from areas near Clark?

No homeowner radon tests have been submitted for Clark yet, so readings from the closest cities and the Randolph County average are used as the best available indicator of local conditions. The EPA recommends testing every individual home.

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.

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

Clark, MO Radon Facts

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

County Randolph County, MO

Zip Code 65243

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.

4.00

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 4.00 pCi/L, based on 7 tests from 5 nearby cities. No readings have been submitted for Clark yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Clark, MO Radon Mitigation

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

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Radon Readings Near Clark, MO

No homeowner tests have been submitted for Clark 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
Hallsville	13.7 mi	5.00 pCi/L	2
Columbia	23.7 mi	3.00 pCi/L	2
Mexico	25.4 mi	4.00 pCi/L	1
Boonville	31.3 mi	4.00 pCi/L	1
Holts Summit	46.4 mi	4.00 pCi/L	1

Randolph County Radon Profile

EPA mapping assigns Randolph County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Direct test data for Randolph County remains limited, so the closest neighboring readings are used here to represent the radon conditions homeowners are likely to encounter. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Randolph County home regardless of zone or a neighbor's results.

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.

Why are radon readings shown from areas near Clark?

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