Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Dukes County, Massachusetts
EPA puts Dukes County in Zone 2, its middle radon zone, and 17.4% of its 317 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
17.4%
6.4 pts below MA
- Dukes
- 17.4%
- MA
- 23.8%
317 tests, 2008 to 2017
Median result
1.7pCi/L
Below action level
- Dukes
- 1.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
317
13th of 14 by tests
- Dukes
- 317
- Middlesex
- 75,220
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 MA
10 of 14
Middle half
- Dukes
- 17.4%
- Worcester
- 33.5%
By share, of 14 with 30+ tests
Read a result for Dukes County
Starts at Dukes County's median, 1.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.7 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Dukes County's median reported result, 2008 to 2017.
The data
Dukes County, At a glance
Dukes County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Dukes County is a
USGS geologic potential: Moderate across 78% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Dukes County, 2008 to 2017, laboratory
Under 2 pCi/L: 55%2 to 4 pCi/L: 28%4 pCi/L and above: 17%
Of 317 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 174 | 54.9% |
| 2 to 4 pCi/L | 88 | 27.8% |
| 4 pCi/L and above | 55 | 17.4% |
What these figures count
These are the 317 tests reported to CDC for Dukes 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).
Dukes County, Compared
Dukes County radon figures, compared
Calculated by Radon411Dukes County's 317 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.7 pCi/L and a maximum of 25.6 pCi/L, and 17.4% reached 4 pCi/L. Massachusetts as a whole (14 Massachusetts counties, pooled) comes to 23.8%: 6.4 points higher than here.
Among its state's counties it ranks 10th of 14 Massachusetts counties with 30 or more tests for the same period. Statewide for the same period, Worcester County reported the highest share (33.5%) and Nantucket County the lowest (5.0%).
Below the action level, 174 tests (54.9%) came in under 2 pCi/L, against 49.6% statewide, and 88 tests (27.8%) fell between 2 and 4, against 26.6% statewide. CDC's ten-year totals for Dukes County went from 276 tests (2005 to 2014) to 317 (2008 to 2017), the share going from 16.7% to 17.4%.
EPA's 1993 zone map puts Dukes County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 78% of the county's land moderate radon potential.
Barnstable County, the one bordering county with a figure for the same period, reported 20.6%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Dukes County, Geology
The ground under Dukes County
PredictedUSGS's geologic map puts all of Dukes County's mapped land in one class: moderate radon potential. 78.2% of it lies in the area the map calls Coastal Plain (Martha's Vineyard), to which USGS gives a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Coastal Plain (Martha's Vineyard) | Cretaceous and Tertiary coastal and marine sediments and Quaternary glacial outwash. | Moderate | 11 | 78.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Dukes County beside the ground around it
Across Massachusetts 31.9% of the land is rated high; none of Dukes County's is. Barnstable County, the one county that borders it, has more moderate-potential ground: 91.3%.
The map rates the ground, not the air in any home.
Local help
Dukes County, Local resources
Radon testing and mitigation in Dukes County
- Radon UnitRadon Unit, run by Department of Public Health, answers questions about testing, mitigation and the rules in Massachusetts.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
- Professionals in Massachusetts5 professionals are listed in Massachusetts.
What Massachusetts's program says
- Phone
- (800) 723-6695
- DPHIAQ.radon@mass.gov
What it means
Dukes County, Questions
Questions about radon in Dukes County
Are radon levels high in Dukes County?
Over the 2008 to 2017 laboratory totals, 17.4% of the radon tests reported to CDC for Dukes County, Massachusetts were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.7 pCi/L. Of 14 Massachusetts counties with 30 or more tests for the same period, 9 reported a higher share; pooled, the state comes to 23.8%.
Which counties border Dukes County?
Dukes County borders 1 county: Barnstable County.
Products
Dukes County, Products
Testing a home in Dukes County
In Dukes County, 17.4% of 317 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 23.8% pooled across Massachusetts. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Dukes County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorAEGTEST
HOUND-3699 radon monitor with a 2.1-inch touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
First reading: Within 1 hour
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Dukes County, Bordering counties
Counties bordering Dukes County
Calculated by Radon411- Radon levels in Barnstable CountyEPA zone 2
20.6%at or above 4 pCi/L
Median 2.0 pCi/L · 6,521 tests · 3.2 points above Dukes County
Dukes County, Residents
Who lives in Dukes County
The Census Bureau estimates 21,219 residents in Dukes County for July 1, 2025, 639 more than in 2020 (+3.1%). That works out to 206 people per square mile of land. Reported testing is thin here: 317 tests over 2008 to 2017, or 14.9 for every 1,000 residents (2025 estimate), where Massachusetts as a whole comes to 32.7.
Census lists no incorporated place in Dukes County: every home in it reads the county's figures.
Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
Dukes County, Homes
Homes in Dukes County
Dukes County is a place of houses on their own lots: 88% of its 17,713 homes are detached single-family houses, against 51% across Massachusetts. Much of Dukes County is recent building: 18% of its homes have gone up since 2000 and the middle year built is 1981, against 1963 for Massachusetts. 75% of occupied homes are lived in by their owner (Massachusetts: 63%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Dukes County | Massachusetts |
|---|---|---|
| Housing units | 17,713 | 3,014,657 |
| Detached houses | 88% | 51% |
| In buildings of 5 or more | 3% | 22% |
| Mobile homes | under 1% | 1% |
| Built before 1960 | 29% | 47% |
| Built since 2000 | 18% | 14% |
| Middle year built | 1981 | 1963 |
| Owner-occupied | 75% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.