Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Hampshire County, Massachusetts
EPA puts Hampshire County in Zone 2, its middle radon zone, and 18.8% of its 2,457 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
18.8%
5.0 pts below MA
- Hampshire
- 18.8%
- MA
- 23.8%
2,457 tests, 2008 to 2017
Median result
1.5pCi/L
Below action level
- Hampshire
- 1.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
2,457
10th of 14 by tests
- Hampshire
- 2,457
- 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
9 of 14
Middle half
- Hampshire
- 18.8%
- Worcester
- 33.5%
By share, of 14 with 30+ tests
Read a result for Hampshire County
Starts at Hampshire County's median, 1.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.5 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. Hampshire County's median reported result, 2008 to 2017.
The data
Hampshire County, At a glance
Hampshire County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Hampshire County is a
USGS geologic potential: Moderate across 70% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Hampshire County, 2008 to 2017, laboratory
Under 2 pCi/L: 59%2 to 4 pCi/L: 22%4 pCi/L and above: 19%
Of 2,457 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 1,445 | 58.8% |
| 2 to 4 pCi/L | 551 | 22.4% |
| 4 pCi/L and above | 461 | 18.8% |
What these figures count
These are the 2,457 tests reported to CDC for Hampshire 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).
Hampshire County, Compared
Hampshire County radon figures, compared
Calculated by Radon411Hampshire County's 2,457 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.5 pCi/L and a maximum of 170.1 pCi/L, and 18.8% reached 4 pCi/L. Massachusetts as a whole (14 Massachusetts counties, pooled) comes to 23.8%: 5.0 points higher than here.
Among its state's counties it ranks 9th 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, 1,445 tests (58.8%) came in under 2 pCi/L, against 49.6% statewide, and 551 tests (22.4%) fell between 2 and 4, against 26.6% statewide. CDC's ten-year totals for Hampshire County went from 2,237 tests (2005 to 2014) to 2,457 (2008 to 2017), the share going from 18.7% to 18.8%.
EPA's 1993 zone map puts Hampshire County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 70% of the county's land moderate radon potential.
Next door, the shares run from 13.1% in Hampden County to 33.5% in Worcester County, with Hampden County below Hampshire County.
CDC also counts 26 tests taken after mitigation in Hampshire County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Hampshire County, Geology
The ground under Hampshire County
PredictedUSGS's geologic map splits Hampshire County: 69.9% of its land is moderate radon potential and 0.1% high and 30.1% low. The map puts 45.5% of Hampshire County in the area it calls Western Connecticut Valley Belt and 30.1% in Mesozoic Basins, with 2 smaller areas beside them. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Western Connecticut Valley Belt | Metasedimentary and metavolcanic gneiss and schist. | Moderate | 11 | 45.5% |
| Mesozoic Basins | Sedimentary and igneous rocks inclusing dolerite, arkose, basalt. | Low | 8 | 30.1% |
| Gneissic Domes | Domes of mafic gneiss surrounded by younger schists and amphobilites, intruded by granite, and overlain by sandy and gravelly to clayey glacial till. | Moderate | 10 | 23.8% |
| Berkshire Mountains | Granitic to dioritic gneiss and schist. | Moderate | 10 | 0.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Hampshire County beside the ground around it
Massachusetts as a whole has more high-potential ground than Hampshire County: 31.9% of its land, against 0.1% here. Of the 4 counties that border it, 2 have more high-potential ground, Worcester County the most at 85.4%.
The map rates the ground, not the air in any home.
Local help
Hampshire County, Local resources
Radon testing and mitigation in Hampshire 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
Hampshire County, Questions
Questions about radon in Hampshire County
Are radon levels high in Hampshire County?
Over the 2008 to 2017 laboratory totals, 18.8% of the radon tests reported to CDC for Hampshire County, Massachusetts were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.5 pCi/L. Of 14 Massachusetts counties with 30 or more tests for the same period, 8 reported a higher share; pooled, the state comes to 23.8%.
Which counties border Hampshire County?
Hampshire County borders 4 counties: Franklin County, Hampden County, Berkshire County and Worcester County.
Products
Hampshire County, Products
Testing a home in Hampshire County
In Hampshire County, 18.8% of 2,457 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 Hampshire 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
MonitorAEGTEST
HOUND-1085 palm-sized rechargeable radon detector
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Hampshire County, Bordering counties
Counties bordering Hampshire County
Calculated by Radon411- Radon levels in Worcester CountyEPA zone 1
33.5%at or above 4 pCi/L
Median 2.6 pCi/L · 46,440 tests · 14.7 points above Hampshire County
- Radon levels in Berkshire CountyEPA zone 2
27.1%at or above 4 pCi/L
Median 1.7 pCi/L · 1,097 tests · 8.3 points above Hampshire County
- Radon levels in Franklin CountyEPA zone 2
22.3%at or above 4 pCi/L
Median 1.6 pCi/L · 802 tests · 3.5 points above Hampshire County
- Radon levels in Hampden CountyEPA zone 2
13.1%at or above 4 pCi/L
Median 1.3 pCi/L · 3,452 tests · 5.7 points below Hampshire County
Hampshire County, Cities and towns
Cities and towns in Hampshire County
Hampshire County is growing: the Census Bureau puts it at 164,065 residents on July 1, 2025, up 10.4% from 148,597 in 2020. That works out to 311 people per square mile of land. Its largest town, Amherst Town, has 40,920 residents, 24.9% of the total. Reported testing is thin here: 2,457 tests over 2008 to 2017, or 15.0 for every 1,000 residents (2025 estimate), where Massachusetts as a whole comes to 32.7.
From Amherst Town to Easthampton Town, CDC publishes no figure by town: each reads Hampshire County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Amherst Town | 40,920 | +47.2% | 24.9% |
| Northampton | 31,047 | +6.0% | 18.9% |
- Easthampton Town
3 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).
Hampshire County, Homes
Homes in Hampshire County
Of Hampshire County's 66,490 homes, 60% are detached houses, against 51% across Massachusetts; 16% are in buildings of five or more homes. Half of its homes were built before 1970, close to Massachusetts' 1963: 41% date from before 1960 and 13% from 2000 or later. 69% 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 | Hampshire County | Massachusetts |
|---|---|---|
| Housing units | 66,490 | 3,014,657 |
| Detached houses | 60% | 51% |
| In buildings of 5 or more | 16% | 22% |
| Mobile homes | 1% | 1% |
| Built before 1960 | 41% | 47% |
| Built since 2000 | 13% | 14% |
| Middle year built | 1970 | 1963 |
| Owner-occupied | 69% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.