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Radon in Westbrook, Maine

EPA puts Cumberland County, where Westbrook is, in Zone 1, its highest radon zone, and high results are common there: 43.5% of the 4,076 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    43.5%

    5.9 pts above ME

    Cumberland
    43.5%
    Maine
    37.6%

    Cumberland, 4th of 16 in ME, 2008 to 2017

  • Median result

    3.2pCi/L

    Below action level

    Cumberland
    3.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of Cumberland's tests, 2008 to 2017

  • Nearest county

    48.4%

    York, 23 miles

    York
    48.4%
    Cumberland
    43.5%

    1,389 tests, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    Cumberland, where Westbrook is

  • Tests reported

    4,076

    In Cumberland

    Cumberland
    4,076
    York
    1,389

    Reported to CDC before any fix, 2008 to 2017

Read a result for Westbrook

Starts at Cumberland County's median, 3.2 pCi/L

3.2pCi/L

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

EPA’s reading of 3.2 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. Cumberland County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Westbrook, What is published

What is published for Westbrook

Information:

Every figure for Westbrook is a county's

Radon data is published by county, not by city, so for Westbrook it is Cumberland County's: its EPA zone (Zone 1) and the 4,076 tests reported to CDC for 2008 to 2017, laboratory. Only a test tells you about one home.

Westbrook covers 17.2 square miles of land, all of it in Cumberland County. About 21,565 people live there, 1,255 to the square mile.

Westbrook, Counties

The county Westbrook lies in

Measured

Cumberland County's EPA zone and the figures CDC publishes for it, 2008 to 2017, laboratory.

Cumberland CountyZone 1Highest predicted potential

43.5%
Reported tests at or above 4 pCi/L
3.2 pCi/L
Median reported result
4,076 tests
Tests reported to CDC
None
Yearly figures on file

Cumberland County ranks 4th of 16 Maine counties with 30 or more tests for that period, 5.9 points above the 37.6% pooled across Maine's counties, 7.8 points above the national pool of 35.7%.

Measured from the middle of Westbrook, the nearest counties with a CDC figure for 2008 to 2017, laboratory are York County (23 miles, 48.4% of 1,389 tests), Sagadahoc County (31 miles, 30.0% of 283 tests) and Androscoggin County (33 miles, 36.9% of 1,497 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 29.6% to 48.4%; the farthest of them, Waldo County, is 82 miles away at 32.1%.

No business in the directory gives Westbrook as its address; the Maine list covers it. Maine's other cities with a page of their own: Bangor.

The counties around Westbrook

By distance from the middle of Westbrook; counties with 30 or more tests.

Nearest counties to Westbrook with 30 or more tests
CountyDistanceTestsAt or above 4 pCi/LMedian
York County23 mi1,38948.4%3.7 pCi/L
Sagadahoc County31 mi28330.0%2.1 pCi/L
Androscoggin County33 mi1,49736.9%2.8 pCi/L
Lincoln County48 mi24635.8%2.5 pCi/L
Kennebec County57 mi69630.3%2.1 pCi/L
Oxford County59 mi39243.1%3.3 pCi/L
Knox County67 mi28729.6%2.3 pCi/L
Waldo County82 mi20932.1%2.3 pCi/L

Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.

Westbrook, Geology

The ground under Westbrook

Predicted

USGS's geologic map puts all of Westbrook's mapped land in one class: high radon potential. All of it lies in the area the map calls Moose River Lowlands/Central Maine Lowlands/Central Maine Highlands/Coastal Province, to which USGS gives a radon index of 14, in the high band (12 to 17).

USGS's geologic areas under Westbrook
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.High14100%

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

Westbrook beside its county and Maine

Westbrook sits on more high-potential ground than Cumberland County as a whole: 100% of the city against 85.5% of the county. Westbrook has more high-potential ground than Maine as a whole: 100% of its land against 24.5%.

Share of land by USGS radon potential: Westbrook, the county it lies in and Maine
AreaEPA zoneLow potentialModerate potentialHigh potential
WestbrookBy countyNoneNone100%
Cumberland CountyZone 110.1%None85.5%
Maine16 counties, pooled by land areaVaries35.9%38.3%24.5%

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

Westbrook, Homes

Homes in Westbrook

Fewer than six in ten of Westbrook's 9,404 homes are detached houses (45%, against 64% across Cumberland County); the rest are attached, in shared buildings or mobile. Half of its homes were built before 1975, close to Cumberland County's 1975: 38% date from before 1960 and 25% from 2000 or later. 64% of occupied homes are lived in by their owner (Cumberland County: 70%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Westbrook, Cumberland County, Maine, 2019 to 2023
HomesWestbrookCumberland CountyMaine
Housing units9,404151,519746,552
Detached houses45%64%70%
In buildings of 5 or more21%14%9%
Mobile homes6%4%8%
Built before 196038%36%35%
Built since 200025%20%20%
Middle year built197519751976
Owner-occupied64%70%74%

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

Local help

Westbrook, Local resources

Local resources for Westbrook

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

The program's own words on licensing are on the Maine page.

What it means

Westbrook, Questions

Questions about radon in Westbrook

What radon zone is Westbrook in?

Westbrook takes its zone from Cumberland County, which EPA puts in Zone 1, the map's highest class: a predicted county average above 4 pCi/L.

What are radon levels in Westbrook?

High results are ordinary around Westbrook: 43.5% of the 4,076 tests reported from Cumberland County for 2008 to 2017 (laboratory totals) were at or above 4 pCi/L, the level at which EPA says to fix a home. The median reported result was 3.2 pCi/L.

Should I test my home in Westbrook?

Yes. Cumberland County reported about 1,773 of its 4,076 tests at or above 4 pCi/L. That is above Maine's pooled 37.6%, and ranks Cumberland County 4th of the 16 Maine counties with 30 or more tests. Which homes they were, no map can say. How to test a home.

What ground is Westbrook built on, as far as radon goes?

USGS's geologic map puts all of Westbrook on one named area, "Moose River Lowlands/Central Maine Lowlands/Central Maine Highlands/Coastal Province", rated high for radon potential, radon index 14.

Is radon higher in the counties around Westbrook?

It depends which way you go. 1 of the 8 nearest counties with a figure report a larger share than Cumberland County's 43.5% and 7 a smaller one: from Knox County (29.6%, 67 miles off) to York County (48.4%, 23 miles off).

The answers use the published figures of Cumberland County, the county Westbrook lies in.

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