Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Kent County, Rhode Island
EPA puts Kent County in Zone 1, its highest radon zone, and only 10 radon tests from it are on file with CDC (2018). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
26.1%
2.3 pts above RI
- Kent
- 26.1%
- RI
- 23.8%
7,657 tests, 2008 to 2017
Median result
2.1pCi/L
Below action level
- Kent
- 2.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
7,657
3rd of 5 by tests
- Kent
- 7,657
- Providence
- 17,655
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in RI
2 of 5
Middle half
- Kent
- 26.1%
- Washington
- 39.1%
By share, of 5 with 30+ tests
Read a result for Kent County
Starts at Kent 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. Kent County's median reported result, 2008 to 2017.
The data
Kent County, At a glance
Kent County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Kent County in
USGS geologic potential: High across 75% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Kent County, 2018
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.7% |
| 2015 | 0.0% |
| 2016 | 0.0% |
| 2017 | 1.4% |
| 2018 | 10.0% |
2018: 10.0%. Across these years the share ran from 0.0% to 10.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 10 tests were reported to CDC for Kent County over 2018, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2018. Measured data period: 2005 to 2018 (every CDC figure on file).
Kent County, Compared
Kent County radon figures, compared
Calculated by Radon411Kent County's 7,657 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.1 pCi/L and a maximum of 192.5 pCi/L, and 26.1% reached 4 pCi/L. Rhode Island as a whole (5 Rhode Island counties, pooled) comes to 23.8%: 2.3 points lower than here.
The newest figure, in 2018, counts only 10 tests (10.0% at or above 4 pCi/L), too few to compare, so this reading uses the 7,657-test figure.
Among its state's counties it ranks 2nd of 5 Rhode Island counties with 30 or more tests for the same period. Statewide for the same period, Washington County reported the highest share (39.1%) and Bristol County the lowest (14.8%).
Below the action level, 3,663 tests (47.8%) came in under 2 pCi/L, against 50.6% statewide, and 1,998 tests (26.1%) fell between 2 and 4, against 25.7% statewide. The busiest year on file was 2017, with 142 tests reported; the quietest, 2016, had 2.
EPA's 1993 zone map puts Kent County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 75% of the county's land high radon potential.
Next door, the shares run from 16.8% in Providence County to 39.1% in Washington County, with Providence County below Kent County.
CDC also counts 47 tests taken after mitigation in Kent 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.
Kent County, Geology
The ground under Kent County
PredictedMost of the ground under Kent County is one class on USGS's geologic map: 75.5% of its land is high radon potential, with 4.2% moderate and 20.0% low. The map puts 75.5% of Kent County in the area it calls Scituate Igneous Suite and 20.0% in Narragansett Bay Group, with one smaller area beside them. USGS gives the first a radon index of 15, in the high band (12 to 17), and the second 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Scituate Igneous Suite | Fine grained granite, alkali-feldspar granite, and granite. | High | 15 | 75.5% |
| Narragansett Bay Group | Sandstone, shale, and conglomerate with minor coal layers. Outwash sand and glacial lake deposits. | Low | 8 | 20.0% |
| Esmond-Dedham Subterrane | Esmond granite, including fine-grained granite, granite, granodiorite, augen granite gneiss, granite gneiss, schist, amphibolite, and quartzite. | Moderate | 11 | 4.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Kent County beside the ground around it
Kent County has more high-potential ground than Rhode Island as a whole: 75.5% of its land against 43.2%. Of the 4 counties that border it, none has as large a share of high-potential ground; Washington County comes nearest at 61.6%.
The map rates the ground, not the air in any home.
Local help
Kent County, Local resources
Radon testing and mitigation in Kent County
- Radon Control ProgramRadon Control Program, run by Rhode Island Department of Health, licenses or certifies radon professionals, and answers questions about testing and mitigation in Rhode Island.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 Rhode Island36 professionals are listed in Rhode Island.
What Rhode Island's program says
- Licensing of radon professionals
This page lists Radon Testing businesses that are licensed by the Rhode Island Department of Health.
What it means
Kent County, Questions
Questions about radon in Kent County
Are radon levels high in Kent County?
In 2018, 10.0% of the radon tests reported to CDC for Kent County, Rhode Island were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.8 pCi/L. Of 5 Rhode Island counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 23.8%.
Which counties border Kent County?
Kent County borders 4 counties: Washington County, RI, Providence County, RI, Windham County, CT and New London County, CT.
Products
Kent County, Products
Testing a home in Kent County
In Kent County, 26.1% of 7,657 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 23.8% pooled across Rhode Island. In Zone 1 the year-round level in Kent County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
MonitorX-Sense
XR0A-iR Wi-Fi battery radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Wi-Fi
- Screen, app
Method: Alpha spectrometry
First reading: Within 24 hours
Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Kent County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Kent County
Explore
Kent County, Bordering counties
Counties bordering Kent County
Calculated by Radon411- Radon levels in Washington County, RIEPA zone 1
39.1%at or above 4 pCi/L
Median 3.0 pCi/L · 7,903 tests · 13.0 points above Kent County
- Radon levels in Windham County, CTEPA zone 2
33.7%at or above 4 pCi/L
Median 2.6 pCi/L · 1,340 tests · 7.6 points above Kent County
- Radon levels in New London County, CTEPA zone 1
27.9%at or above 4 pCi/L
Median 2.1 pCi/L · 2,081 tests · 1.8 points above Kent County
- Radon levels in Providence County, RIEPA zone 2
16.8%at or above 4 pCi/L
Median 1.6 pCi/L · 17,655 tests · 9.3 points below Kent County
Kent County, Cities and towns
Cities and towns in Kent County
The Census Bureau estimates 173,495 residents in Kent County for July 1, 2025, 3,076 more than in 2020 (+1.8%). Packed into its land, that is 1,029 people per square mile. Warwick, its one incorporated place, has 84,187 residents, 48.5% of the total. CDC's 7,657 reported tests for 2008 to 2017 work out to 44.1 per 1,000 residents (2025 estimate), close to Rhode Island's 34.0.
Warwick is the one incorporated place here; CDC publishes no figure by town, so it reads Kent County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Warwick | 84,187 | +1.6% | 48.5% |
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).
Kent County, Homes
Homes in Kent County
Of Kent County's 76,319 homes, 67% are detached houses, against 55% across Rhode Island; 17% are in buildings of five or more homes. Half of its homes were built before 1966, close to Rhode Island's 1961: 43% date from before 1960 and 8% from 2000 or later. 72% of occupied homes are lived in by their owner (Rhode Island: 63%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Kent County | Rhode Island |
|---|---|---|
| Housing units | 76,319 | 484,615 |
| Detached houses | 67% | 55% |
| In buildings of 5 or more | 17% | 17% |
| Mobile homes | 2% | 1% |
| Built before 1960 | 43% | 49% |
| Built since 2000 | 8% | 10% |
| Middle year built | 1966 | 1961 |
| Owner-occupied | 72% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.