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 Wicomico County, Maryland
EPA puts Wicomico County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 0.0% of 32 (2008 to 2017, laboratory totals) reached 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
0.0%
23.9 pts below MD
- Wicomico
- 0.0%
- Maryland
- 23.9%
32 tests, 2008 to 2017
Median result
0.9pCi/L
Below action level
- Wicomico
- 0.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
32
19th of 19 by tests
- Wicomico
- 32
- Montgomery
- 10,969
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Maryland
19 of 19
Lowest quarter
- Wicomico
- 0.0%
- Washington
- 56.0%
By share, of 19 with 30+ tests
Read a result for Wicomico County
Starts at Wicomico County's median, 0.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.9 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. Wicomico County's median reported result, 2008 to 2017.
The data
Wicomico County, At a glance
Wicomico County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 98% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Wicomico County, 2008 to 2017, laboratory
Under 2 pCi/L: 84%2 to 4 pCi/L: 16%4 pCi/L and above: 0%
Of 32 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 27 | 84.4% |
| 2 to 4 pCi/L | 5 | 15.6% |
| 4 pCi/L and above | 0 | 0.0% |
What these figures count
These are the 32 tests reported to CDC for Wicomico 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).
Wicomico County, Compared
Wicomico County radon figures, compared
Calculated by Radon411Only 0 of 32 radon tests reported for Wicomico County over the 2008 to 2017 laboratory totals reached 4 pCi/L (0.0%). The median result, 0.9 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 3.8 pCi/L.
Across 24 Maryland counties pooled together, 23.9% of tests reached that level, so Wicomico County runs 23.9 points below its state. Against the national pool of 35.7%, the gap is 35.7 points lower. Its place in the state: 19th of 19 Maryland counties with 30 or more tests for the same period.
Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 0.0% share point the same way here. Sussex County, DE, the one bordering county with a figure for the same period, reported 10.4%.
Below the action level, 27 tests (84.4%) came in under 2 pCi/L, against 56.6% statewide, and 5 tests (15.6%) fell between 2 and 4, against 19.5% statewide. USGS geology rates 98% of the county's land low radon potential.
CDC's ten-year totals for Wicomico County went from 45 tests (2005 to 2014) to 32 (2008 to 2017), the share going from 0.0% to 0.0%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Wicomico County, Geology
The ground under Wicomico County
PredictedUSGS's geologic map puts all of Wicomico County's mapped land in one class: low radon potential. 98.2% 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 | 98.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Wicomico County beside the ground around it
Across Maryland 36.7% of the land is rated high; none of Wicomico County's is. None of the 4 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Wicomico County, Local resources
Radon testing and mitigation in Wicomico 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
Wicomico County, Questions
Questions about radon in Wicomico County
Are radon levels high in Wicomico County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Wicomico County, Maryland were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Of 19 Maryland counties with 30 or more tests for the same period, 18 reported a higher share; pooled, the state comes to 23.9%.
Which counties border Wicomico County?
Wicomico County borders 4 counties: Worcester County, MD, Somerset County, MD, Sussex County, DE and Dorchester County, MD.
Products
Wicomico County, Products
Testing a home in Wicomico County
In Wicomico County, 0.0% of 32 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 23.9% pooled across Maryland. 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 Wicomico County.
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
Monitor
Wave Plus battery radon and air quality monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- App only
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Wicomico County, Bordering counties
Counties bordering Wicomico County
Calculated by Radon411- Radon levels in Dorchester County, MDEPA zone 3
16.7%at or above 4 pCi/L
Median 1.6 pCi/L · 6 tests · 16.7 points above Wicomico County
- Radon levels in Sussex County, DEEPA zone 3
10.4%at or above 4 pCi/L
Median 1.0 pCi/L · 451 tests · 10.4 points above Wicomico County
- Radon levels in Worcester County, MDEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 7 tests · 0.0 points above Wicomico County
- Radon levels in Somerset County, MDEPA zone 2
0.0%at or above 4 pCi/L
Median 0.3 pCi/L · 2 tests · 0.0 points above Wicomico County
Wicomico County, Cities and towns
Cities and towns in Wicomico County
The Census Bureau estimates 106,899 residents in Wicomico County for July 1, 2025, 3,322 more than in 2020 (+3.2%). That works out to 285 people per square mile of land. Its largest town, Salisbury, has 33,845 residents, 31.7% of the total. Together its 8 incorporated places hold 46.4% of those residents; the other 53.6% live outside any of them. Reported testing is thin here: 32 tests over 2008 to 2017, or 0.3 for every 1,000 residents (2025 estimate), where Maryland as a whole comes to 7.7.
From Salisbury to Mardela Springs, CDC publishes no figure by town: each reads Wicomico County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Salisbury | 33,845 | +2.7% | 31.7% |
| Fruitland | 6,007 | +8.6% | 5.6% |
| Delmar | 4,896 | +26.0% | 4.6% |
| Pittsville | 1,659 | +2.0% | 1.6% |
| Hebron | 1,119 | +1.5% | 1.0% |
| Willards | 1,018 | +5.5% | 1.0% |
| Sharptown | 692 | +3.0% | 0.6% |
| Mardela Springs | 346 | +0.9% | 0.3% |
8 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).
Wicomico County, Homes
Homes in Wicomico County
Of Wicomico County's 43,925 homes, 70% are detached houses, against 51% across Maryland; 16% are in buildings of five or more homes. Half of its homes were built before 1983, close to Maryland's 1979: 23% date from before 1960 and 26% from 2000 or later. 61% 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 | Wicomico County | Maryland |
|---|---|---|
| Housing units | 43,925 | 2,545,532 |
| Detached houses | 70% | 51% |
| In buildings of 5 or more | 16% | 23% |
| Mobile homes | 4% | 1% |
| Built before 1960 | 23% | 27% |
| Built since 2000 | 26% | 20% |
| Middle year built | 1983 | 1979 |
| Owner-occupied | 61% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.