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Maine Radon Map and Levels by County

Maine's counties span EPA Zones 1 and 2. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

Predicted
12 of 16counties in Zone 1, EPA's highest radon zone
Measured
By countyCDC publishes Maine's test figures by county: 16 of 16 counties have one.
Your home
Test to knowNo area figure here is a reading of your home.
How to test this homeFind a certified tester

The data

Maine, At a glance

Maine at a glance

Predicted: EPA radon zone

16 of 16 counties classified

EPA classifies counties, not states. Of the 16 counties in Maine with a zone, 12 are in Zone 1 and 4 in Zone 2.

  • Zone 1: Highest predicted potentialgreater than 4 pCi/L12 of 16 counties · 75.0%
  • Zone 2: Moderate predicted potential2 to 4 pCi/L4 of 16 counties · 25.0%

An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes Maine's radon test figures by county: 16 of its 16 counties have one. Each one's share is in the county list.

Maine, Counties

Maine counties by EPA zone

Predicted

Maine's radon map, then all 16 counties by the zone EPA predicts for each, highest reported share of tests at or above 4 pCi/L first. Each has its own report.

Maine radon map by county: EPA radon zones. Map of Maine's 16 counties shaded by EPA radon zone: Zone 1 in red-orange, Zone 2 in amber. 12 in Zone 1, 4 in Zone 2, 0 in Zone 3.
Maine radon map by countyEPA radon zones for Maine's counties: 12 counties in Zone 1, 4 counties in Zone 2, 0 counties in Zone 3.Predicted potential for each county, not a reading of any home. Homes with elevated levels of radon have been found in all three zones.

Zone 1: highest predicted potential12

Local help

Maine, Local resources

Local resources in Maine

Who to ask in Maine: its radon program, test kits and professionals.

What Maine's program says
Phone
207-287-5676
Email
radon.dhhs@maine.gov
Licensing of radon professionals
Under Maine law, only the owner or occupant of a residence or someone registered with the state to provide these services, may test for radon, install and/or advise on the installation of a radon reduction (mitigation) system.

Radon Action Brief

National Radon Action MonthPre-sale

The radon brief for your Maine county, in one dated file.

  • Your area's radon record, explained.
  • Your plan to test this week.
  • Fix costs and pros near you.

Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25

Get your Maine county's BriefSee a free sample

Area data, not a test of the building.

What it means

Maine, Questions

Questions about radon in Maine

Common questions

9 questions, answered from the figures above

Is radon a problem in Maine?

EPA's Map of Radon Zones places 12 of the 16 Maine counties it classifies in Zone 1, the highest predicted potential, 4 in Zone 2 and 0 in Zone 3. An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.

Maine on the radon mapRadon levels by state

Who does radon mitigation in Maine?

Radon411 has no radon business listed for Maine yet. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional.

How radon mitigation worksWhat mitigation costsRadon professionals in Maine

How do I get a radon test in Maine?

EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. The Maine radon program is the place to ask about certified testers and any test kit offer it runs.

How to test a homeFree and low-cost kits by stateMaine radon program

Which Maine counties are in EPA radon Zone 1?

12 counties are in Zone 1: Androscoggin County, Aroostook County, Cumberland County, Franklin County, Hancock County, Kennebec County, Lincoln County, Oxford County, and 4 more in the county table on this page. Zone 1 is EPA's class for highest predicted potential, a predicted average indoor screening level greater than 4 pCi/L. A zone is a prediction for a county, not a measurement of any home.

Radon in Androscoggin CountyRadon in Aroostook CountyRadon in Cumberland County

Which Maine counties have the highest radon?

16 of Maine's 16 counties have an EPA radon zone published here. Radon411 will not rank counties on data it does not hold, and a zone is a prediction for an area rather than a measurement of any building.

What share of radon tests in Maine are high?

CDC has published no statewide radon testing statistics for Maine, so we cannot give a figure. Where CDC does publish one, the percentage describes radon tests reported to CDC, not homes.

Which EPA region is Maine in?

Maine is in EPA Region 1: New England.

Do I need to test my home in Maine?

Yes, wherever you live in the state. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L.

Why does this page show coverage rather than one radon level for Maine?

A statewide figure averages counties with very different geology and very different numbers of reported tests, so it hides more than it shows. The county report is the level at which the EPA zone, the geologic potential and the reported testing statistics are actually published, which is why the county table above links to every one of them.

If you own, buy, sell or rent

What these figures mean for each reader, with the guide that covers it

The zone counts on this page describe counties across Maine. They are predictions for areas, and none of them measures your building.

Maine in figures

The figures above, said in words

What the published data says about Maine, in words. A zone and a share of tests describe an area, never the level in any one home.

    • Predicted

      Predicted

      EPA places 12 of Maine's 16 counties in Zone 1 and 4 in Zone 2.

      Zone 1 counties, A to Z, begin with Androscoggin County, Aroostook County and Cumberland County; the county section below lists all 12.

    • Compared

      Calculated by Radon411

      75% of Maine's counties with a zone on file are in Zone 1, a larger share than across all U.S. counties (34%). It is a share of counties, not of land, people or homes.

  • Reported tests

    Measured

    CDC has no statewide testing figure for Maine on file here.

    16 of the 16 counties have a published county figure; the most tests in each one's latest year were reported for Cumberland County (4,076 tests over 2008 to 2017, laboratory), Androscoggin County (1,497 tests over 2008 to 2017, laboratory) and Penobscot County (1,491 tests over 2008 to 2017, laboratory).

  • Local record

    Maine's radon program is the Maine Radiation Control Program, run by Maine Center for Disease Control & Prevention; its contacts are under Local resources.

    2 cities have a page setting the figures of the counties it lies in side by side: Bangor and Westbrook.

Products

Maine, Products

Testing and mitigation products

Whatever the figures for Maine show, only a test tells you about one home.

Test kits and monitors42

See all products

As an Amazon Associate, Radon411 earns from qualifying purchases.

Best radon monitors for Maine homes, compared

Testing

5

Mitigation

3

Explore

Cities in Maine with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.

Maine, Next steps

What to do next

  1. LearnKnow what radon isWhat radon is, how it gets indoors, and why a county zone is not a reading for your home.Learn about radon
  2. TestTest the building you live inShort-term or long-term, where the device goes, and closed-house conditions.How to test
  3. FixBring a high level downHow a mitigation system works, and the retest that confirms it.How mitigation works
  4. Find a proHire a certified professionalMeasurement and mitigation professionals by state, with their certifications.Find a professional

Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.