Portland, MO Radon Levels

Q: What EPA Radon Zone is Portland in?

Portland is in Callaway County, EPA Zone 2.

Q: How much does radon mitigation cost in Portland?

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

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

Portland, MO Radon Facts

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

County Callaway County, MO

Zip Code 65067

Located in Callaway County within the Jefferson City metro area, Portland sits on Missouri River bluff formations that can harbor varying radon potential. Testing data for zip code 65067 remains limited, emphasizing the importance of individual home assessment. The area's limestone bedrock and mixed residential development make property-specific testing essential for understanding indoor air quality.

4.00

pCi/L area average

Above EPA Action Level

Callaway County average: 4.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Portland itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Portland, 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 Portland?

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Radon Readings Near Portland, MO

No homeowner tests have been submitted for Portland 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
Holts Summit	22.2 mi	4.00 pCi/L	1
Jefferson City	27.9 mi	6.00 pCi/L	1
New Haven	28.0 mi	5.00 pCi/L	1
Mexico	33.1 mi	4.00 pCi/L	1
Columbia	33.8 mi	3.00 pCi/L	2
Hallsville	38.5 mi	5.00 pCi/L	2
Union	41.9 mi	13.00 pCi/L	1
Troy	45.3 mi	8.50 pCi/L	4

Callaway County Radon Profile

EPA mapping assigns Callaway County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 1 city in Callaway County average 4.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Callaway County home regardless of zone or a neighbor's results.

Radon FAQ for Portland, MO

What EPA Radon Zone is Portland in?

Portland and the 65067 zip code are in Callaway 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 Portland?

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

Radon mitigation in Portland 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 Portland?

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.