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 Caroline County, Maryland
EPA puts Caroline County in Zone 3, its lowest radon zone, and only 12 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
16.9%
Kent County
- Kent
- 16.9%
- Sussex
- 10.4%
3 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
16.9%
Queen Anne's County, 17 miles
- Queen Anne's
- 16.9%
- Maryland
- 23.9%
Share at 4+ pCi/L, 65 tests, 2008 to 2017
Ground above low
None
64.3 pts below Maryland
- Caroline
- 0.0%
- Maryland
- 64.3%
Share of land USGS rates moderate or high potential
Tests reported
13
Too few for a share
- Caroline
- 13
- Needed
- 30
2006 to 2015, laboratory
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Caroline County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.
The data
Caroline County, At a glance
Caroline County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 99% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Caroline County, 2008 to 2017, laboratory
CDC holds 12 reported tests for Caroline County over the 2008 to 2017 laboratory totals, with a median of 0.8 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Caroline County beside the counties around it is how this page reads it.
What these figures count
Only 12 tests were reported to CDC for Caroline County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Caroline County, Compared
Caroline County radon figures, compared
Calculated by Radon411CDC's largest figure for Caroline County rests on 13 tests over the 2006 to 2015 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 7.7 points and no rank or comparison is drawn from it. Results reached as high as 2.6 pCi/L, with a middle value of 1.1 pCi/L.
Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Kent County, DE reported the largest share at or above 4 pCi/L, 16.9%, and Sussex County, DE the smallest, 10.4%, with Queen Anne's County at 16.9% between. Farther out, Kent County (29 miles away) at 52.6%, Wicomico County (36 miles away) at 0.0% and Anne Arundel County (43 miles away) at 17.4% have figures too. Pooled across 24 Maryland counties, 23.9% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Washington County reported the highest share (56.0%) and Wicomico County the lowest (0.0%). EPA's 1993 map puts Caroline County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 99% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Caroline County, Geology
The ground under Caroline County
PredictedUSGS's geologic map puts all of Caroline County's mapped land in one class: low radon potential. 98.5% of it lies in the area the map calls Eastern Shore, to which USGS gives a radon index of 7, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Eastern Shore | Quaternary coastal sand, silt. | Low | 7 | 98.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Caroline County beside the ground around it
Across Maryland 36.7% of the land is rated high; none of Caroline County's is. None of the 5 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Caroline County, Local resources
Radon testing and mitigation in Caroline County
- Maryland's radon programMaryland Department of HealthMaryland's radon program offers free or discounted test kits, and answers questions about testing and mitigation in Maryland.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Maryland residents may be eligible for a free radon test kit.
- Compare kits
- Professionals in Maryland5 professionals are listed in Maryland.
What Maryland's program says
- Phone
- 1-866-703-3266
What it means
Caroline County, Questions
Questions about radon in Caroline County
Are radon levels high in Caroline County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Caroline County, Maryland were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.8 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Kent County, DE reported the largest share at or above 4 pCi/L, 16.9%, and Sussex County, DE the smallest, 10.4%, with Queen Anne's County at 16.9% between.
Which counties border Caroline County?
Caroline County borders 5 counties: Queen Anne's County, MD, Kent County, DE, Talbot County, MD, Sussex County, DE and Dorchester County, MD.
Products
Caroline County, Products
Testing a home in Caroline County
No CDC figure names Caroline County; the nearest county with one, Queen Anne's County (17 miles away), reported 16.9% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Caroline County.
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
Caroline County, Bordering counties
Counties bordering Caroline County
Calculated by Radon411- Radon levels in Queen Anne's County, MDEPA zone 3
16.9%at or above 4 pCi/L
Median 1.3 pCi/L · 65 tests
- Radon levels in Kent County, DEEPA zone 3
16.9%at or above 4 pCi/L
Median 1.6 pCi/L · 1,516 tests
- Radon levels in Dorchester County, MDEPA zone 3
16.7%at or above 4 pCi/L
Median 1.6 pCi/L · 6 tests
- Radon levels in Sussex County, DEEPA zone 3
10.4%at or above 4 pCi/L
Median 1.0 pCi/L · 451 tests
- Radon levels in Talbot County, MDEPA zone 3
7.7%at or above 4 pCi/L
Median 1.1 pCi/L · 26 tests
Caroline County, Cities and towns
Cities and towns in Caroline County
The Census Bureau estimates 34,116 residents in Caroline County for July 1, 2025, 842 more than in 2020 (+2.5%). That works out to 107 people per square mile of land. No town dominates: Denton, the largest, has 5,075 residents, 14.9% of the total. Reported testing is thin here: 13 tests over 2006 to 2015, or 0.4 for every 1,000 residents (2025 estimate), where Maryland as a whole comes to 6.2.
From Denton to Templeville, CDC publishes no figure by town: each reads Caroline County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Denton | 5,075 | +4.7% | 14.9% |
| Federalsburg | 2,864 | +1.1% | 8.4% |
| Greensboro | 1,962 | +2.7% | 5.8% |
| Ridgely | 1,630 | +1.2% | 4.8% |
| Preston | 684 | +1.5% | 2.0% |
| Goldsboro | 215 | +1.9% | 0.6% |
| Marydel | 177 | +0.6% | 0.5% |
| Henderson | 161 | +0.6% | 0.5% |
| Hillsboro | 133 | −0.7% | 0.4% |
| Templevilleextends beyond Caroline County | 117 | +1.7% | Counted whole |
10 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). A place that extends beyond Caroline County is counted whole, so it has no share.
Caroline County, Homes
Homes in Caroline County
Caroline County is a place of houses on their own lots: 76% of its 13,516 homes are detached single-family houses, against 51% across Maryland. Half of its homes were built before 1981, close to Maryland's 1979: 27% date from before 1960 and 19% from 2000 or later. 72% of occupied homes are lived in by their owner (Maryland: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Caroline County | Maryland |
|---|---|---|
| Housing units | 13,516 | 2,545,532 |
| Detached houses | 76% | 51% |
| In buildings of 5 or more | 7% | 23% |
| Mobile homes | 8% | 1% |
| Built before 1960 | 27% | 27% |
| Built since 2000 | 19% | 20% |
| Middle year built | 1981 | 1979 |
| Owner-occupied | 72% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.