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 Lamoille County, Vermont
EPA puts Lamoille County in Zone 2, its middle radon zone, and 22.6% of its 62 reported radon tests (2023) 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
22.6%
2.0 pts above VT
- Lamoille
- 22.6%
- Vermont
- 20.6%
62 tests, 2023
Median result
1.8pCi/L
Below action level
- Lamoille
- 1.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
62
7th of 12 by tests
- Lamoille
- 62
- Chittenden
- 398
Reported to CDC before any fix, 2023
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 Vermont
5 of 12
Middle half
- Lamoille
- 22.6%
- Bennington
- 29.5%
By share, of 12 with 30+ tests
Read a result for Lamoille County
Starts at Lamoille County's median, 1.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.8 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. Lamoille County's median reported result, 2023.
The data
Lamoille County, At a glance
Lamoille County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Lamoille County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Lamoille County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 12.9% |
| 2015 | 8.0% |
| 2016 | 11.9% |
| 2017 | 13.6% |
| 2018 | 14.5% |
| 2019 | 16.7% |
| 2020 | 14.1% |
| 2021 | 20.7% |
| 2022 | 15.2% |
| 2023 | 22.6% |
2023: 22.6%. Across these years the share ran from 8.0% to 22.6%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 62 tests reported to CDC for Lamoille County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Lamoille County, Compared
Lamoille County radon figures, compared
Calculated by Radon411Lamoille County's 62 reported tests in 2023 had a middle value of 1.8 pCi/L and a maximum of 17.9 pCi/L, and 22.6% reached 4 pCi/L. Vermont as a whole (14 Vermont counties, pooled) comes to 20.6%: 2.0 points lower than here.
Among its state's counties it ranks 5th of 12 Vermont counties with 30 or more tests for the same period. Statewide for the same period, Bennington County reported the highest share (29.5%) and Chittenden County the lowest (14.6%).
Below the action level, 34 tests (54.8%) came in under 2 pCi/L, against 56.8% statewide, and 14 tests (22.6%) fell between 2 and 4, against 22.5% statewide. The busiest year on file was 2022, with 198 tests reported; the quietest, 2015, had 25.
EPA's 1993 zone map puts Lamoille County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Next door, the shares run from 14.6% in Chittenden County to 26.1% in Washington County, with Orleans County, Caledonia County and Chittenden County below Lamoille County. Over 9 years of annual figures the share rose 9.7 points, from 12.9% in 2014 to 22.6% in 2023; its peak was 22.6% in 2023.
CDC also counts 5 tests taken after mitigation in Lamoille County for the same period: tests in homes where a fix was already in.
Lamoille CountyVermont, pooled
| Year | Tests | Lamoille County, at or above 4 pCi/L | Vermont, pooled |
|---|---|---|---|
| 2014 | 31 | 12.9% | 18.3% |
| 2016 | 59 | 11.9% | 15.9% |
| 2017 | 88 | 13.6% | 16.4% |
| 2018 | 62 | 14.5% | 15.8% |
| 2019 | 72 | 16.7% | 14.3% |
| 2020 | 92 | 14.1% | 16.5% |
| 2021 | 87 | 20.7% | 19.2% |
| 2022 | 198 | 15.2% | 19.4% |
| 2023 | 62 | 22.6% | 20.6% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Lamoille County, Geology
The ground under Lamoille County
PredictedUSGS's geologic map puts all of Lamoille County's mapped land in one class: moderate radon potential. The map puts 63.3% of Lamoille County in the area it calls Green Mountains and 36.7% in Vermont Piedmont. USGS gives both 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 |
|---|---|---|---|---|
| Green Mountains | Proterozoic to Paleozoic metaigneous and metasedimentary rocks. | Moderate | 11 | 63.3% |
| Vermont Piedmont | Paleozoic metavolcanic and metasedimentary rocks that are intruded by igneous plutonic rocks. | Moderate | 11 | 36.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Lamoille County beside the ground around it
Lamoille County has more moderate-potential ground than Vermont as a whole: 100% of its land against 87.8%. Of the 5 counties that border it, none has as large a share of moderate-potential ground; Washington County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Lamoille County, Local resources
Radon testing and mitigation in Lamoille County
- Radon ProgramRadon Program, run by Vermont Department of Health, offers free or discounted test kits, and answers questions about testing and mitigation in Vermont.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Join the Department of Health Lab's study on radon in water to receive free test kits for your well or spring.
- Compare kits
- See the Vermont directoryNo professionals are listed in Vermont yet. The state program can point you to registered testers and mitigators.
What Vermont's program says
- Phone
- 802-863-7220
What it means
Lamoille County, Questions
Questions about radon in Lamoille County
Are radon levels high in Lamoille County?
In 2023, 22.6% of the radon tests reported to CDC for Lamoille County, Vermont were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of 12 Vermont counties with 30 or more tests for the same period, 4 reported a higher share; pooled, the state comes to 20.6%.
Which counties border Lamoille County?
Lamoille County borders 5 counties: Franklin County, Chittenden County, Orleans County, Washington County and Caledonia County.
Products
Lamoille County, Products
Testing a home in Lamoille County
In Lamoille County, 22.6% of 62 tests reported to CDC in 2023 reached 4 pCi/L, against 20.6% pooled across Vermont. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Lamoille 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
MonitorForensics Detectors
FD-65-RADON rechargeable radon detector with a color screen
- 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
Lamoille County, Bordering counties
Counties bordering Lamoille County
Calculated by Radon411- Radon levels in Washington CountyEPA zone 2
26.1%at or above 4 pCi/L
Median 2.0 pCi/L · 199 tests · 3.5 points above Lamoille County
- Radon levels in Franklin CountyEPA zone 2
23.4%at or above 4 pCi/L
Median 1.5 pCi/L · 47 tests · 0.8 points above Lamoille County
- Radon levels in Orleans CountyEPA zone 2
21.6%at or above 4 pCi/L
Median 1.7 pCi/L · 51 tests · 1.0 points below Lamoille County
- Radon levels in Caledonia CountyEPA zone 2
21.1%at or above 4 pCi/L
Median 2.0 pCi/L · 76 tests · 1.5 points below Lamoille County
- Radon levels in Chittenden CountyEPA zone 3
14.6%at or above 4 pCi/L
Median 1.3 pCi/L · 398 tests · 8.0 points below Lamoille County
Lamoille County, Cities and towns
Cities and towns in Lamoille County
The Census Bureau estimates 26,294 residents in Lamoille County for July 1, 2025, 367 more than in 2020 (+1.4%). That works out to 57 people per square mile of land. No town dominates: Morrisville, the largest, has 2,404 residents, 9.1% of the total. Together its 5 incorporated places hold 19.4% of those residents; the other 80.6% live outside any of them. CDC's 62 reported tests for 2023 work out to 2.4 per 1,000 residents (2025 estimate), close to Vermont's 2.0.
From Morrisville to Cambridge, CDC publishes no figure by town: each reads Lamoille County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Morrisville | 2,404 | +12.4% | 9.1% |
| Johnson | 1,326 | −2.5% | 5.0% |
| Jeffersonville | 747 | −4.4% | 2.8% |
| Hyde Park | 424 | −1.4% | 1.6% |
| Cambridge | 192 | −3.5% | 0.7% |
5 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).
Lamoille County, Homes
Homes in Lamoille County
Of Lamoille County's 14,138 homes, 66% are detached houses, against 67% across Vermont; 9% are mobile homes. Half of its homes were built before 1982, close to Vermont's 1976: 25% date from before 1960 and 23% from 2000 or later. 73% of occupied homes are lived in by their owner (Vermont: 73%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Lamoille County | Vermont |
|---|---|---|
| Housing units | 14,138 | 337,072 |
| Detached houses | 66% | 67% |
| In buildings of 5 or more | 8% | 11% |
| Mobile homes | 9% | 6% |
| Built before 1960 | 25% | 33% |
| Built since 2000 | 23% | 17% |
| Middle year built | 1982 | 1976 |
| Owner-occupied | 73% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.