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Radon Levels in Oxford County, Maine

EPA puts Oxford County in Zone 1, its highest radon zone, and high results are common there: 43.1% of the 392 radon tests reported to CDC (2008 to 2017, laboratory totals) came back 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

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  • Share at 4+ pCi/L

    43.1%

    5.5 pts above ME

    Oxford
    43.1%
    Maine
    37.6%

    392 tests, 2008 to 2017

  • Median result

    3.3pCi/L

    Below action level

    Oxford
    3.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    392

    7th of 16 by tests

    Oxford
    392
    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

    5 of 16

    Middle half

    Oxford
    43.1%
    York
    48.4%

    By share, of 16 with 30+ tests

Read a result for Oxford County

Starts at Oxford County's median, 3.3 pCi/L

3.3pCi/L

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

EPA’s reading of 3.3 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. Oxford County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Oxford County, At a glance

Oxford County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Oxford 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 85% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Oxford County, 2008 to 2017, laboratory
Under 2 pCi/L: 32%2 to 4 pCi/L: 25%4 pCi/L and above: 43%

Of 392 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Oxford County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L12732.4%
2 to 4 pCi/L9624.5%
4 pCi/L and above16943.1%
What these figures count

These are the 392 tests reported to CDC for Oxford 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

Oxford County, Compared

Oxford County radon figures, compared

Calculated by Radon411

In Oxford County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (169 of 392) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 7.4 points higher. Across 16 Maine counties pooled together, 37.6% of tests reached that level, so Oxford County runs 5.5 points above its state.

Of 6 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 29.1% (Franklin County) to 48.4% (York County). By share, Oxford County is 5th of 16 Maine counties with 30 or more tests for the same period.

Half the tests came in under 3.3 pCi/L and half over it; the single highest reached 126.1 pCi/L. Below the action level, 127 tests (32.4%) came in under 2 pCi/L, against 41.4% statewide, and 96 tests (24.5%) fell between 2 and 4, against 21.0% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 43.1% share point the same way here. USGS geology rates 85% of the county's land high radon potential. CDC also counts 8 tests taken after mitigation in Oxford County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Oxford County went from 248 tests (2005 to 2014) to 392 (2008 to 2017), the share going from 40.3% to 43.1%.

Oxford County against Maine, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Oxford County
Oxford County39243.1%3.3 pCi/LThis county
Maine, pooled16 counties, pooled11,82537.6%Not pooled−5.5 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−7.4 points
Piscataquis Countyhighest in the state4447.7%3.5 pCi/L+4.6 points
Penobscot Countylowest in the state1,49116.4%0.8 pCi/L−26.7 points
York County, MEborders it1,38948.4%3.7 pCi/L+5.3 points
Carroll County, NHborders it42548.2%3.5 pCi/L+5.1 points
Cumberland County, MEborders it4,07643.5%3.2 pCi/L+0.4 points
Androscoggin County, MEborders it1,49736.9%2.8 pCi/L−6.2 points
Coos County, NHborders it36233.7%2.3 pCi/L−9.4 points
Franklin County, MEborders it14129.1%1.8 pCi/L−14.0 points
Where Oxford County's reported results fell, 2008 to 2017, laboratory, beside Maine and the United States
ResultOxford County testsOxford County shareMaine shareU.S. shareAgainst Maine
Under 2 pCi/L12732.4%41.4%39.6%−9.0 points
2 to 4 pCi/L9624.5%21.0%24.7%+3.5 points
4 pCi/L and above16943.1%37.6%35.7%+5.5 points
Oxford 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
York County1 of 161,38948.4%3.7 pCi/L
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
Oxford County ten-year laboratory totals, against Maine's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMaine, pooledChange from the row before
2008 to 201739243.1%3.3 pCi/L126.1 pCi/L37.6%+1.2 points
2007 to 201632041.9%3.3 pCi/L126.1 pCi/L37.6%+0.3 points
2006 to 201527941.6%3.3 pCi/L126.1 pCi/L37.6%+1.3 points
2005 to 201424840.3%3.2 pCi/L126.1 pCi/L36.6%First on file

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

Oxford County, Geology

The ground under Oxford County

Predicted

Most of the ground under Oxford County is one class on USGS's geologic map: 85.1% of its land is high radon potential, with 14.9% moderate. The map puts 74.2% of Oxford County in the area it calls Moose River Lowlands/Central Maine Lowlands/Central Maine Highlands/Coastal Province and 14.8% in Moose River Lowlands/Central Maine Lowlands/Central Maine Highlands/Coastal Province, with one smaller area beside them. USGS gives the first a radon index of 14, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).

USGS's geologic areas under Oxford County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Moose River Lowlands/Central Maine Lowlands/Central Maine Highlands/Coastal ProvinceGranite and high grade metamorphic rocks.High1474.2%
Moose River Lowlands/Central Maine Lowlands/Central Maine Highlands/Coastal ProvinceHeterogeneous metamorphic and igneous rocks.Moderate1114.8%
Central Maine HighlandsClastic and carbonate sedimentary rocks.High1410.9%

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

Oxford County beside the ground around it

Oxford County has more high-potential ground than Maine as a whole: 85.1% of its land against 24.5%. Of the 6 counties that border it, 2 have more high-potential ground, York County the most at 99.1%.

Share of land by USGS radon potential: Oxford County, the 6 counties bordering it and Maine
AreaEPA zoneLow potentialModerate potentialHigh potential
Oxford CountyZone 1None14.9%85.1%
Androscoggin CountyZone 132.3%None67.7%
Coos County, NHZone 2None83.7%16.3%
Franklin CountyZone 10.3%65.1%34.5%
Cumberland CountyZone 110.1%None85.5%
Carroll County, NHZone 116.2%38.0%45.9%
York CountyZone 1None0.1%99.1%
Maine16 counties, pooled by land areaVaries35.9%38.3%24.5%

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

Local help

Oxford County, Local resources

Radon testing and mitigation in Oxford 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

Oxford County, Questions

Questions about radon in Oxford County

Are radon levels high in Oxford County?

Over the 2008 to 2017 laboratory totals, 43.1% of the radon tests reported to CDC for Oxford County, Maine were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of 16 Maine counties with 30 or more tests for the same period, 4 reported a higher share; pooled, the state comes to 37.6%.

Which counties border Oxford County?

Oxford County borders 6 counties: Androscoggin County, ME, Coos County, NH, Franklin County, ME, Cumberland County, ME, Carroll County, NH and York County, ME.

Products

Oxford County, Products

Testing a home in Oxford County

In Oxford County, 43.1% of 392 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 Oxford 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

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

Explore

Oxford County, Bordering counties

Counties bordering Oxford County

Calculated by Radon411

Oxford County, Residents

Who lives in Oxford County

The Census Bureau estimates 60,346 residents in Oxford County for July 1, 2025, 2,452 more than in 2020 (+4.2%). That works out to 29 people per square mile of land. CDC's 392 reported tests for 2008 to 2017 work out to 6.5 per 1,000 residents (2025 estimate), close to Maine's 8.4.

Census lists no incorporated place in Oxford County: every home in it reads the county's figures.

Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Oxford County, Homes

Homes in Oxford County

Of Oxford County's 36,558 homes, 75% are detached houses, against 70% across Maine; 11% are mobile homes. Half of its homes were built before 1976, close to Maine's 1976: 34% date from before 1960 and 19% from 2000 or later. Owners live in 81% of the occupied homes (Maine: 74%), so for most households a test and a fix are their own to order.

Homes in Oxford County, Maine, 2019 to 2023
HomesOxford CountyMaine
Housing units36,558746,552
Detached houses75%70%
In buildings of 5 or more6%9%
Mobile homes11%8%
Built before 196034%35%
Built since 200019%20%
Middle year built19761976
Owner-occupied81%74%

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