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Radon Levels in Androscoggin County, Maine

EPA puts Androscoggin County in Zone 1, its highest radon zone, and 36.9% of its 1,497 reported radon tests (2008 to 2017, laboratory totals) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    36.9%

    0.7 pts below ME

    Androscoggin
    36.9%
    Maine
    37.6%

    1,497 tests, 2008 to 2017

  • Median result

    2.8pCi/L

    Below action level

    Androscoggin
    2.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,497

    2nd of 16 by tests

    Androscoggin
    1,497
    Cumberland
    4,076

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Maine

    7 of 16

    Middle half

    Androscoggin
    36.9%
    York
    48.4%

    By share, of 16 with 30+ tests

Read a result for Androscoggin County

Starts at Androscoggin County's median, 2.8 pCi/L

2.8pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 2.8 pCi/L

Between 2 and 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Androscoggin County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Androscoggin County, At a glance

Androscoggin County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Androscoggin County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 68% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Androscoggin County, 2008 to 2017, laboratory

Reported results by concentration band, Androscoggin County, 2008 to 2017, laboratory
Under 2 pCi/L: 37%2 to 4 pCi/L: 26%4 pCi/L and above: 37%

Of 1,497 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Androscoggin County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L55637.1%
2 to 4 pCi/L38926.0%
4 pCi/L and above55236.9%
What these figures count

These are the 1,497 tests reported to CDC for Androscoggin County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Androscoggin County, Compared

Androscoggin County radon figures, compared

Calculated by Radon411

In Androscoggin County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (552 of 1,497) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 1.2 points higher. Across 16 Maine counties pooled together, 37.6% of tests reached that level, so Androscoggin County runs 0.7 points below its state.

Of 5 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 29.1% (Franklin County) to 43.5% (Cumberland County). By share, Androscoggin County is 7th of 16 Maine counties with 30 or more tests for the same period.

Half the tests came in under 2.8 pCi/L and half over it; the single highest reached 84.1 pCi/L. Below the action level, 556 tests (37.1%) came in under 2 pCi/L, against 41.4% statewide, and 389 tests (26.0%) fell between 2 and 4, against 21.0% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 36.9% share point the same way here. USGS geology rates 68% of the county's land high radon potential. CDC also counts 11 tests taken after mitigation in Androscoggin County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Androscoggin County went from 1,006 tests (2005 to 2014) to 1,497 (2008 to 2017), the share going from 37.0% to 36.9%.

Androscoggin County against Maine, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Androscoggin County
Androscoggin County1,49736.9%2.8 pCi/LThis county
Maine, pooled16 counties, pooled11,82537.6%Not pooled+0.7 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−1.2 points
York Countyhighest in the state1,38948.4%3.7 pCi/L+11.5 points
Penobscot Countylowest in the state1,49116.4%0.8 pCi/L−20.5 points
Cumberland County, MEborders it4,07643.5%3.2 pCi/L+6.6 points
Oxford County, MEborders it39243.1%3.3 pCi/L+6.2 points
Kennebec County, MEborders it69630.3%2.1 pCi/L−6.6 points
Sagadahoc County, MEborders it28330.0%2.1 pCi/L−6.9 points
Franklin County, MEborders it14129.1%1.8 pCi/L−7.8 points
Where Androscoggin County's reported results fell, 2008 to 2017, laboratory, beside Maine and the United States
ResultAndroscoggin County testsAndroscoggin County shareMaine shareU.S. shareAgainst Maine
Under 2 pCi/L55637.1%41.4%39.6%−4.3 points
2 to 4 pCi/L38926.0%21.0%24.7%+5.0 points
4 pCi/L and above55236.9%37.6%35.7%−0.7 points
Androscoggin County ranked among the 16 Maine counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Piscataquis County2 of 164447.7%3.5 pCi/L
Aroostook County3 of 1660845.1%3.5 pCi/L
Cumberland County4 of 164,07643.5%3.2 pCi/L
Oxford County5 of 1639243.1%3.3 pCi/L
Hancock County6 of 1632739.1%2.6 pCi/L
Androscoggin County7 of 161,49736.9%2.8 pCi/L
Lincoln County8 of 1624635.8%2.5 pCi/L
Waldo County9 of 1620932.1%2.3 pCi/L
Kennebec County10 of 1669630.3%2.1 pCi/L
Sagadahoc County11 of 1628330.0%2.1 pCi/L
Washington County12 of 165429.6%1.6 pCi/L
Androscoggin County ten-year laboratory totals, against Maine's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMaine, pooledChange from the row before
2008 to 20171,49736.9%2.8 pCi/L84.1 pCi/L37.6%−0.7 points
2007 to 20161,37037.6%2.8 pCi/L84.1 pCi/L37.6%−0.2 points
2006 to 20151,17037.8%2.8 pCi/L84.1 pCi/L37.6%+0.8 points
2005 to 20141,00637.0%2.7 pCi/L84.1 pCi/L36.6%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Androscoggin County, Geology

The ground under Androscoggin County

Predicted

USGS's geologic map splits Androscoggin County: 67.7% of its land is high radon potential and 32.3% low. The map puts 34.1% of Androscoggin County in the area it calls Central Maine Highlands and 32.3% in Coastal Province, with 2 smaller areas beside them. USGS gives the first a radon index of 14, in the high band (12 to 17), and the second 8, in the low band (5 to 8).

USGS's geologic areas under Androscoggin County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Central Maine HighlandsClastic and carbonate sedimentary rocks.High1434.1%
Coastal ProvinceGlacial lake clay and marine clay.Low832.3%
Moose River Lowlands/Central Maine Lowlands/Central Maine Highlands/Coastal ProvinceGranite and high grade metamorphic rocks.High1418.7%
Central Maine HighlandsMafic granite and alkalai feldspar granite.High1415.0%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Androscoggin County beside the ground around it

Androscoggin County has more high-potential ground than Maine as a whole: 67.7% of its land against 24.5%. Of the 5 counties that border it, 2 have more high-potential ground, Cumberland County the most at 85.5%.

Share of land by USGS radon potential: Androscoggin County, the 5 counties bordering it and Maine
AreaEPA zoneLow potentialModerate potentialHigh potential
Androscoggin CountyZone 132.3%None67.7%
Cumberland CountyZone 110.1%None85.5%
Kennebec CountyZone 130.4%32.7%36.9%
Sagadahoc CountyZone 275.4%None10.5%
Oxford CountyZone 1None14.9%85.1%
Franklin CountyZone 10.3%65.1%34.5%
Maine16 counties, pooled by land areaVaries35.9%38.3%24.5%

The map rates the ground, not the air in any home.

Local help

Androscoggin County, Local resources

Radon testing and mitigation in Androscoggin County

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.

What it means

Androscoggin County, Questions

Questions about radon in Androscoggin County

Are radon levels high in Androscoggin County?

Over the 2008 to 2017 laboratory totals, 36.9% of the radon tests reported to CDC for Androscoggin County, Maine were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.8 pCi/L. Of 16 Maine counties with 30 or more tests for the same period, 6 reported a higher share; pooled, the state comes to 37.6%.

Which counties border Androscoggin County?

Androscoggin County borders 5 counties: Cumberland County, Kennebec County, Sagadahoc County, Oxford County and Franklin County.

Products

Androscoggin County, Products

Testing a home in Androscoggin County

In Androscoggin County, 36.9% of 1,497 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 37.6% pooled across Maine. In Zone 1 the year-round level in Androscoggin County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Androscoggin County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Androscoggin County

Explore

Androscoggin County, Bordering counties

Counties bordering Androscoggin County

Calculated by Radon411

Androscoggin County, Cities and towns

Cities and towns in Androscoggin County

The Census Bureau estimates 116,487 residents in Androscoggin County for July 1, 2025, 5,306 more than in 2020 (+4.8%). That works out to 249 people per square mile of land. Its largest town, Lewiston, has 38,866 residents, 33.4% of the total. Together its 2 incorporated places hold 55.2% of those residents; the other 44.8% live outside any of them. Testing is reported here more often than across the state: CDC's 1,497 reported tests for 2008 to 2017 come to 12.9 for every 1,000 residents (2025 estimate), against 8.4 for Maine.

From Lewiston to Auburn, CDC publishes no figure by town: each reads Androscoggin County's.

The cities and towns in Androscoggin County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Lewiston38,866+4.7%33.4%
Auburn25,441+5.6%21.8%

2 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Androscoggin County, Homes

Homes in Androscoggin County

Of Androscoggin County's 50,202 homes, 58% are detached houses, against 70% across Maine; 14% are in buildings of five or more homes. Half of its homes were built before 1969, close to Maine's 1976: 41% date from before 1960 and 17% from 2000 or later. 67% of occupied homes are lived in by their owner (Maine: 74%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Androscoggin County, Maine, 2019 to 2023
HomesAndroscoggin CountyMaine
Housing units50,202746,552
Detached houses58%70%
In buildings of 5 or more14%9%
Mobile homes9%8%
Built before 196041%35%
Built since 200017%20%
Middle year built19691976
Owner-occupied67%74%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.