Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Gloucester County, New Jersey
EPA puts Gloucester County in Zone 2, its middle radon zone, and most reported tests there come back low, though 12.2% of 3,333 (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
12.2%
2.5 pts above NJ
- Gloucester
- 12.2%
- New Jersey
- 9.7%
3,333 tests, 2022
Median result
1.1pCi/L
Below action level
- Gloucester
- 1.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2022
Tests reported
3,333
14th of 21 by tests
- Gloucester
- 3,333
- Bergen
- 11,440
Reported to CDC before any fix, 2022
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 New Jersey
6 of 21
Middle half
- Gloucester
- 12.2%
- Warren
- 24.6%
By share, of 21 with 30+ tests
Read a result for Gloucester County
Starts at Gloucester County's median, 1.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.1 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. Gloucester County's median reported result, 2022.
The data
Gloucester County, At a glance
Gloucester County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Gloucester County is a
USGS geologic potential: Low across 68% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Gloucester County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 17.6% |
| 2015 | 15.0% |
| 2016 | 13.3% |
| 2017 | 13.1% |
| 2018 | 15.6% |
| 2019 | 11.5% |
| 2020 | 13.5% |
| 2021 | 11.2% |
| 2022 | 12.2% |
2022: 12.2%. Across these years the share ran from 11.2% to 17.6%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 3,333 tests reported to CDC for Gloucester 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).
Gloucester County, Compared
Gloucester County radon figures, compared
Calculated by Radon41112.2% of its 3,333 tests in 2022 were at or above 4 pCi/L. That is 2.5 points above the 9.7% pooled from 21 New Jersey counties.
Ordered from highest share down, it comes 6th of 21 New Jersey counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 23.9%; Gloucester County sits 11.7 points below it.
Next door, the shares run from 2.1% in Atlantic County to 10.8% in Salem County, with Salem County, Cumberland County and Camden County below Gloucester County. Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 12.2% share point the same way here.
Half the tests came in under 1.1 pCi/L and half over it; the single highest reached 59.1 pCi/L. The rest split 70.5% under 2 pCi/L and 17.3% from 2 to 4 (New Jersey: 74.9% and 15.4%). Year by year, 2014 opened at 17.6% and 2022 closed at 12.2% (down 5.4 points), with 2014 the high at 17.6%.
The busiest year on file was 2020, with 4,453 tests reported; the quietest, 2014, had 1,792.
Gloucester CountyNew Jersey, pooled
| Year | Tests | Gloucester County, at or above 4 pCi/L | New Jersey, pooled |
|---|---|---|---|
| 2014 | 1,792 | 17.6% | 12.8% |
| 2015 | 2,198 | 15.0% | 12.5% |
| 2016 | 2,426 | 13.3% | 12.5% |
| 2017 | 2,901 | 13.1% | 11.9% |
| 2018 | 2,947 | 15.6% | 11.0% |
| 2019 | 3,630 | 11.5% | 11.2% |
| 2020 | 4,453 | 13.5% | 11.7% |
| 2021 | 4,005 | 11.2% | 10.3% |
| 2022 | 3,333 | 12.2% | 9.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Gloucester County, Geology
The ground under Gloucester County
PredictedUSGS's geologic map splits Gloucester County: 67.7% of its land is low radon potential and 32.3% moderate. The map puts 67.7% of Gloucester County in the area it calls Outer Coastal Plain and 32.2% in Inner Coastal Plain. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 10, in the moderate band (9 to 11).
| 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 | 67.7% |
| Inner Coastal Plain | Cretaceous-Lower Tertiary gravel, sand, silt, clay. | Moderate | 10 | 32.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Gloucester County beside the ground around it
Across New Jersey 29.8% of the land is rated high; none of Gloucester County's is. Of the 7 counties that border it, 2 have more high-potential ground, Delaware County, PA the most at 76.6%.
The map rates the ground, not the air in any home.
Local help
Gloucester County, Local resources
Radon testing and mitigation in Gloucester 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
Gloucester County, Questions
Questions about radon in Gloucester County
Are radon levels high in Gloucester County?
In 2022, 12.2% of the radon tests reported to CDC for Gloucester County, New Jersey were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.1 pCi/L. Of 21 New Jersey counties with 30 or more tests for the same period, 5 reported a higher share; pooled, the state comes to 9.7%.
Which counties border Gloucester County?
Gloucester County borders 7 counties: Camden County, NJ, Salem County, NJ, Delaware County, PA, Philadelphia County, PA, Cumberland County, NJ, Atlantic County, NJ and New Castle County, DE.
Products
Gloucester County, Products
Testing a home in Gloucester County
In Gloucester County, 12.2% of 3,333 tests reported to CDC in 2022 reached 4 pCi/L, against 9.7% pooled across New Jersey. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Gloucester County; a long-term test tells the year-round average.
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
MonitorKidde
Radon Detector (RAB) battery digital radon detector with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Gloucester County, Bordering counties
Counties bordering Gloucester County
Calculated by Radon411- Radon levels in Salem County, NJEPA zone 2
10.8%at or above 4 pCi/L
Median 1.1 pCi/L · 454 tests · 1.4 points below Gloucester County
- Radon levels in Cumberland County, NJEPA zone 2
8.6%at or above 4 pCi/L
Median 0.9 pCi/L · 752 tests · 3.6 points below Gloucester County
- Radon levels in Camden County, NJEPA zone 2
6.7%at or above 4 pCi/L
Median 0.9 pCi/L · 6,761 tests · 5.5 points below Gloucester County
- Radon levels in Atlantic County, NJEPA zone 3
2.1%at or above 4 pCi/L
Median 0.3 pCi/L · 1,047 tests · 10.1 points below Gloucester County
- Radon levels in Delaware County, PAEPA zone 1
No CDC figure for 2022; its page reads it against its own neighbours.
- Radon levels in Philadelphia County, PAEPA zone 3
No CDC figure for 2022; its page reads it against its own neighbours.
- Radon levels in New Castle County, DEEPA zone 2
No CDC figure for 2022; its page reads it against its own neighbours.
Gloucester County, Cities and towns
Cities and towns in Gloucester County
The Census Bureau estimates 312,638 residents in Gloucester County for July 1, 2025, 10,074 more than in 2020 (+3.3%). That works out to 971 people per square mile of land. No town dominates: Glassboro, the largest, has 24,483 residents, 7.8% of the total. Together its 11 incorporated places hold 24.5% of those residents; the other 75.5% live outside any of them. CDC's 3,333 reported tests for 2022 work out to 10.7 per 1,000 residents (2025 estimate), close to New Jersey's 11.4.
From Glassboro to Newfield, CDC publishes no figure by town: each reads Gloucester County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Glassboro | 24,483 | +5.7% | 7.8% |
| Woodbury | 10,130 | +1.8% | 3.2% |
| Clayton | 9,041 | +2.7% | 2.9% |
| Pitman | 8,961 | +2.0% | 2.9% |
| Paulsboro | 6,329 | +2.1% | 2.0% |
| Westville | 4,357 | +2.1% | 1.4% |
| Woodbury Heights | 3,162 | +2.0% | 1.0% |
| National Park | 3,088 | +1.9% | 1.0% |
| Swedesboro | 2,766 | +2.0% | 0.9% |
| Wenonah | 2,330 | +2.1% | 0.7% |
| Newfield | 1,823 | +2.1% | 0.6% |
11 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).
Gloucester County, Homes
Homes in Gloucester County
Of Gloucester County's 117,530 homes, 74% are detached houses, against 53% across New Jersey; 11% are in buildings of five or more homes. Much of Gloucester County is recent building: 22% of its homes have gone up since 2000 and the middle year built is 1979, 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 | Gloucester County | New Jersey |
|---|---|---|
| Housing units | 117,530 | 3,775,842 |
| Detached houses | 74% | 53% |
| In buildings of 5 or more | 11% | 22% |
| Mobile homes | 2% | 1% |
| Built before 1960 | 25% | 38% |
| Built since 2000 | 22% | 15% |
| Middle year built | 1979 | 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.