Portland, ME Radon Mitigation and Testing

Q: What is the average radon level in Portland, ME?

Based on 1 user-submitted tests, the average radon level is 4.00 pCi/L.

Q: What EPA Radon Zone is Portland in?

Portland is in Cumberland County, EPA Zone 1.

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.

Avg: 4.00 pCi/L

Cumberland County

EPA Zone 1

1 user test

Maine's largest city in Cumberland County shows an average radon level of 4.0 pCi/L, right at the EPA action threshold. Built on granite bedrock with a housing mix spanning from historic brick to modern construction, Portland's zip code 04101 area requires careful attention to radon levels. While current readings meet EPA guidelines, the geological foundation and basement-heavy housing stock warrant regular testing.

4.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Portland, ME. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Portland, ME Radon Mitigation

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

Portland, ME Radon Testing

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

Portland, Maine Radon Levels

User-submitted radon test readings from homes in the Portland area.

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	Portland, ME	100+ Years	Full Basement	Apr 2021

Have a radon test result for Portland? Submit your reading to help other homeowners.

Portland Radon Facts

Key details about the radon risk profile for Portland and the 04101 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Cumberland County, ME

Zip Code

04101

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

4.00 pCi/L

User Tests Submitted

Portland and the 04101 zip code are located in Cumberland County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Portland, ME

What is the average radon level in Portland, ME?

Based on 1 user-submitted test, the average radon level in Portland is 4.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Portland in?

Portland and the 04101 zip code are in Cumberland County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

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.

Most Active Radon Markets in Maine

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Rumford	5.67 pCi/L	3
York	8.50 pCi/L	2
Saco	7.50 pCi/L	2
Hampden	4.50 pCi/L	2
Scarborough	14.00 pCi/L	1
Kittery	12.00 pCi/L	1
South Portland	10.00 pCi/L	1
Portland	4.00 pCi/L	1