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 Cape May County, New Jersey
EPA puts Cape May County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 0.0% of 246 (2022) 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%
9.7 pts below NJ
- Cape May
- 0.0%
- New Jersey
- 9.7%
246 tests, 2022
Median result
0.3pCi/L
Below action level
- Cape May
- 0.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2022
Tests reported
246
21st of 21 by tests
- Cape May
- 246
- Bergen
- 11,440
Reported to CDC before any fix, 2022
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in New Jersey
21 of 21
Lowest quarter
- Cape May
- 0.0%
- Warren
- 24.6%
By share, of 21 with 30+ tests
Read a result for Cape May County
Starts at Cape May County's median, 0.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.3 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. Cape May County's median reported result, 2022.
The data
Cape May County, At a glance
Cape May County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 93% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Cape May County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 0.0% |
| 2016 | 1.2% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2019 | 0.0% |
| 2020 | 0.0% |
| 2021 | 1.3% |
| 2022 | 0.0% |
2022: 0.0%. Across these years the share ran from 0.0% to 1.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 246 tests reported to CDC for Cape May County over 2022, 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: 2022. Measured data period: 2014 to 2022 (every CDC figure on file).
Cape May County, Compared
Cape May County radon figures, compared
Calculated by Radon411Only 0 of 246 radon tests reported for Cape May County in 2022 reached 4 pCi/L (0.0%). The median result, 0.3 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 3.1 pCi/L.
Across 21 New Jersey counties pooled together, 9.7% of tests reached that level, so Cape May County runs 9.7 points below its state. Against the national pool of 23.9%, the gap is 23.9 points lower. Its place in the state: 21st of 21 New Jersey 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. Of 2 neighbours with a figure, all 2 reported a larger share at or above 4 pCi/L; the spread is 2.1% (Atlantic County) to 8.6% (Cumberland County).
Below the action level, 242 tests (98.4%) came in under 2 pCi/L, against 74.9% statewide, and 4 tests (1.6%) fell between 2 and 4, against 15.4% statewide. Over 9 years of annual figures the share held within 2 points, from 0.0% in 2014 to 0.0% in 2022; its peak was 1.3% in 2021. USGS geology rates 93% of the county's land low radon potential.
The busiest year on file was 2022, with 246 tests reported; the quietest, 2018, had 77.
Cape May CountyNew Jersey, pooled
0.0% % of tests9.7% % of tests
| Year | Tests | Cape May County, at or above 4 pCi/L | New Jersey, pooled |
|---|---|---|---|
| 2014 | 109 | 0.0% | 12.8% |
| 2015 | 101 | 0.0% | 12.5% |
| 2016 | 81 | 1.2% | 12.5% |
| 2017 | 108 | 0.0% | 11.9% |
| 2018 | 77 | 0.0% | 11.0% |
| 2019 | 111 | 0.0% | 11.2% |
| 2020 | 206 | 0.0% | 11.7% |
| 2021 | 150 | 1.3% | 10.3% |
| 2022 | 246 | 0.0% | 9.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Cape May County, Geology
The ground under Cape May County
PredictedUSGS's geologic map puts all of Cape May County's mapped land in one class: low radon potential. 93.4% of it lies in the area the map calls Outer Coastal Plain, to which USGS gives a radon index of 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Outer Coastal Plain | Upper Tertiary-Quaternary gravel, sand, silt, clay. | Low | 8 | 93.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Cape May County beside the ground around it
Across New Jersey 29.8% of the land is rated high; none of Cape May County's is. None of the 2 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Cape May County, Local resources
Radon testing and mitigation in Cape May County
- Radon SectionRadon Section, run by New Jersey Department of Environmental Protection, licenses or certifies radon professionals, offers free or discounted test kits and states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in New Jersey.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Check with your municipal or county health department for free radon test kits or purchase a test kit from a hardware store or a NJ certified radon business.
- Compare kits
- Professionals in New Jersey15 professionals are listed in New Jersey.
What New Jersey's program says
- Phone
- 800-648-0394
- Licensing of radon professionals
By law, all businesses and professionals conducting radon testing and mitigation in New Jersey must be certified by the DEP.
- Disclosure when a home is sold or rented
Under the law, the seller must provide the buyer, at the time the contract of sale is entered into, with a copy of the results of the radon test and evidence of any mitigation or treatment.
What it means
Cape May County, Questions
Questions about radon in Cape May County
Are radon levels high in Cape May County?
In 2022, 0.0% of the radon tests reported to CDC for Cape May County, New Jersey were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.3 pCi/L. Of 21 New Jersey counties with 30 or more tests for the same period, 20 reported a higher share; pooled, the state comes to 9.7%.
Which counties border Cape May County?
Cape May County borders 2 counties: Cumberland County and Atlantic County.
Products
Cape May County, Products
Testing a home in Cape May County
In Cape May County, 0.0% of 246 tests reported to CDC in 2022 reached 4 pCi/L, against 9.7% pooled across New Jersey. 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 Cape May 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
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
Cape May County, Bordering counties
Counties bordering Cape May County
Calculated by Radon411- Radon levels in Cumberland CountyEPA zone 2
8.6%at or above 4 pCi/L
Median 0.9 pCi/L · 752 tests · 8.6 points above Cape May County
- Radon levels in Atlantic CountyEPA zone 3
2.1%at or above 4 pCi/L
Median 0.3 pCi/L · 1,047 tests · 2.1 points above Cape May County
Cape May County, Cities and towns
Cities and towns in Cape May County
About 93,390 people live in Cape May County by the Census Bureau's estimate for July 1, 2025, 1,639 fewer than in 2020 (−1.7%). That works out to 371 people per square mile of land. No town dominates: Ocean City, the largest, has 11,101 residents, 11.9% of the total. Together its 12 incorporated places hold 35.8% of those residents; the other 64.2% live outside any of them. Reported testing is thin here: 246 tests over 2022, or 2.6 for every 1,000 residents (2025 estimate), where New Jersey as a whole comes to 11.4.
From Ocean City to Cape May Point, CDC publishes no figure by town: each reads Cape May County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Ocean City | 11,101 | −1.1% | 11.9% |
| Wildwood | 5,068 | −1.4% | 5.4% |
| North Wildwood | 3,518 | −2.7% | 3.8% |
| Wildwood Crest | 3,000 | −3.1% | 3.2% |
| Cape May | 2,716 | −1.5% | 2.9% |
| Sea Isle City | 2,114 | +0.6% | 2.3% |
| Woodbine | 2,104 | −0.7% | 2.3% |
| Avalon | 1,205 | −2.7% | 1.3% |
| West Cape May | 981 | −1.8% | 1.1% |
| Stone Harbor | 778 | −1.6% | 0.8% |
| West Wildwood | 529 | −1.9% | 0.6% |
| Cape May Point | 298 | −1.7% | 0.3% |
12 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).
Cape May County, Homes
Homes in Cape May County
Fewer than six in ten of Cape May County's 99,625 homes are detached houses (52%, against 53% across New Jersey); the rest are attached, in shared buildings or mobile. Much of Cape May County is recent building: 23% of its homes have gone up since 2000 and the middle year built is 1980, against 1969 for New Jersey. Owners live in 79% of the occupied homes (New Jersey: 64%), so for most households a test and a fix are their own to order.
| Homes | Cape May County | New Jersey |
|---|---|---|
| Housing units | 99,625 | 3,775,842 |
| Detached houses | 52% | 53% |
| In buildings of 5 or more | 9% | 22% |
| Mobile homes | 3% | 1% |
| Built before 1960 | 27% | 38% |
| Built since 2000 | 23% | 15% |
| Middle year built | 1980 | 1969 |
| Owner-occupied | 79% | 64% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.