Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Sagadahoc County, Maine
EPA puts Sagadahoc County in Zone 2, its middle radon zone, and 30.0% of its 283 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
Share at 4+ pCi/L
30.0%
7.6 pts below ME
- Sagadahoc
- 30.0%
- Maine
- 37.6%
283 tests, 2008 to 2017
Median result
2.1pCi/L
Below action level
- Sagadahoc
- 2.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
283
10th of 16 by tests
- Sagadahoc
- 283
- Cumberland
- 4,076
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Maine
11 of 16
Middle half
- Sagadahoc
- 30.0%
- York
- 48.4%
By share, of 16 with 30+ tests
Read a result for Sagadahoc County
Starts at Sagadahoc County's median, 2.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.1 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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. Sagadahoc County's median reported result, 2008 to 2017.
The data
Sagadahoc County, At a glance
Sagadahoc County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Sagadahoc County is a
USGS geologic potential: Low across 75% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Sagadahoc County, 2008 to 2017, laboratory
Under 2 pCi/L: 48%2 to 4 pCi/L: 22%4 pCi/L and above: 30%
Of 283 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 136 | 48.1% |
| 2 to 4 pCi/L | 62 | 21.9% |
| 4 pCi/L and above | 85 | 30.0% |
What these figures count
These are the 283 tests reported to CDC for Sagadahoc 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).
Sagadahoc County, Compared
Sagadahoc County radon figures, compared
Calculated by Radon411In Sagadahoc County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (85 of 283) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 5.7 points lower. Across 16 Maine counties pooled together, 37.6% of tests reached that level, so Sagadahoc County runs 7.6 points below its state.
Of 4 neighbours with a figure, all 4 reported a larger share at or above 4 pCi/L; the spread is 30.3% (Kennebec County) to 43.5% (Cumberland County). By share, Sagadahoc County is 11th of 16 Maine counties with 30 or more tests for the same period.
Half the tests came in under 2.1 pCi/L and half over it; the single highest reached 63.7 pCi/L. Below the action level, 136 tests (48.1%) came in under 2 pCi/L, against 41.4% statewide, and 62 tests (21.9%) fell between 2 and 4, against 21.0% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 30.0% share point the same way here. USGS geology rates 75% of the county's land low radon potential.
CDC's ten-year totals for Sagadahoc County went from 206 tests (2005 to 2014) to 283 (2008 to 2017), the share going from 30.1% to 30.0%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Sagadahoc County, Geology
The ground under Sagadahoc County
PredictedMost of the ground under Sagadahoc County is one class on USGS's geologic map: 75.4% of its land is low radon potential, with 10.5% high. The map puts 75.4% of Sagadahoc County in the area it calls Coastal Province and 10.5% in Central Maine Highlands. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Coastal Province | Glacial lake clay and marine clay. | Low | 8 | 75.4% |
| Central Maine Highlands | Clastic and carbonate sedimentary rocks. | High | 14 | 10.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Sagadahoc County beside the ground around it
Maine as a whole has more high-potential ground than Sagadahoc County: 24.5% of its land, against 10.5% here. Of the 4 counties that border it, 3 have more high-potential ground, Cumberland County the most at 85.5%.
The map rates the ground, not the air in any home.
Local help
Sagadahoc County, Local resources
Radon testing and mitigation in Sagadahoc County
- Maine Radiation Control ProgramMaine Radiation Control Program, run by Maine Center for Disease Control & Prevention, licenses or certifies radon professionals, and answers questions about testing and mitigation in Maine.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- See the Maine directoryNo professionals are listed in Maine yet. The state program can point you to registered testers and mitigators.
What Maine's program says
- Phone
- 207-287-5676
- 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
Sagadahoc County, Questions
Questions about radon in Sagadahoc County
Are radon levels high in Sagadahoc County?
Over the 2008 to 2017 laboratory totals, 30.0% of the radon tests reported to CDC for Sagadahoc County, Maine were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.1 pCi/L. Of 16 Maine counties with 30 or more tests for the same period, 10 reported a higher share; pooled, the state comes to 37.6%.
Which counties border Sagadahoc County?
Sagadahoc County borders 4 counties: Lincoln County, Androscoggin County, Cumberland County and Kennebec County.
Products
Sagadahoc County, Products
Testing a home in Sagadahoc County
In Sagadahoc County, 30.0% of 283 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 37.6% pooled across Maine. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Sagadahoc County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Monitor
Hello Radon C battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Sagadahoc County, Bordering counties
Counties bordering Sagadahoc County
Calculated by Radon411- Radon levels in Cumberland CountyEPA zone 1
43.5%at or above 4 pCi/L
Median 3.2 pCi/L · 4,076 tests · 13.5 points above Sagadahoc County
- Radon levels in Androscoggin CountyEPA zone 1
36.9%at or above 4 pCi/L
Median 2.8 pCi/L · 1,497 tests · 6.9 points above Sagadahoc County
- Radon levels in Lincoln CountyEPA zone 1
35.8%at or above 4 pCi/L
Median 2.5 pCi/L · 246 tests · 5.8 points above Sagadahoc County
- Radon levels in Kennebec CountyEPA zone 1
30.3%at or above 4 pCi/L
Median 2.1 pCi/L · 696 tests · 0.3 points above Sagadahoc County
Sagadahoc County, Cities and towns
Cities and towns in Sagadahoc County
The Census Bureau estimates 37,979 residents in Sagadahoc County for July 1, 2025, 1,248 more than in 2020 (+3.4%). That works out to 150 people per square mile of land. Bath, its one incorporated place, has 8,835 residents, 23.3% of the total. CDC's 283 reported tests for 2008 to 2017 work out to 7.5 per 1,000 residents (2025 estimate), close to Maine's 8.4.
Bath is the one incorporated place here; CDC publishes no figure by town, so it reads Sagadahoc County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Bath | 8,835 | +0.7% | 23.3% |
One incorporated place, 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).
Sagadahoc County, Homes
Homes in Sagadahoc County
Sagadahoc County is a place of houses on their own lots: 76% of its 19,109 homes are detached single-family houses, against 70% across Maine. Half of its homes were built before 1977, close to Maine's 1976: 37% date from before 1960 and 21% from 2000 or later. Owners live in 78% of the occupied homes (Maine: 74%), so for most households a test and a fix are their own to order.
| Homes | Sagadahoc County | Maine |
|---|---|---|
| Housing units | 19,109 | 746,552 |
| Detached houses | 76% | 70% |
| In buildings of 5 or more | 7% | 9% |
| Mobile homes | 7% | 8% |
| Built before 1960 | 37% | 35% |
| Built since 2000 | 21% | 20% |
| Middle year built | 1977 | 1976 |
| Owner-occupied | 78% | 74% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.