Portland, TN Radon Levels

Q: What EPA Radon Zone is Portland in?

Portland is in Sumner 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, TN Radon Facts

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

County Sumner County, TN

Zip Code 37148

This Sumner County community in the Nashville Metro area sits on limestone bedrock typical of Middle Tennessee's Highland Rim region. Testing data remains limited for zip code 37148, making it crucial for homeowners to conduct professional radon assessments. Many homes in this area feature basements or crawl spaces built over the limestone geology that can allow radon infiltration.

4.00

pCi/L area average

Above EPA Action Level

Sumner 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, TN 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, TN

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
White House	11.8 mi	6.00 pCi/L	1
Gallatin	13.1 mi	4.00 pCi/L	1
Old Hickory	23.3 mi	12.00 pCi/L	1
Madison	23.9 mi	5.00 pCi/L	1
Mount Juliet	26.1 mi	2.00 pCi/L	1
Hermitage	26.9 mi	4.00 pCi/L	1
Lebanon	30.5 mi	5.00 pCi/L	1
Nashville	32.9 mi	7.00 pCi/L	1

Sumner County Radon Profile

EPA mapping assigns Sumner 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 Sumner 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 Sumner County home regardless of zone or a neighbor's results.

Radon FAQ for Portland, TN

What EPA Radon Zone is Portland in?

Portland and the 37148 zip code are in Sumner 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 Sumner 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.