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Radon Levels in Atlantic County, New Jersey

EPA puts Atlantic County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 2.1% of 1,047 (2022) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    2.1%

    7.6 pts below NJ

    Atlantic
    2.1%
    New Jersey
    9.7%

    1,047 tests, 2022

  • Median result

    0.3pCi/L

    Below action level

    Atlantic
    0.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2022

  • Tests reported

    1,047

    18th of 21 by tests

    Atlantic
    1,047
    Bergen
    11,440

    Reported to CDC before any fix, 2022

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

  • Rank in New Jersey

    19 of 21

    Lowest quarter

    Atlantic
    2.1%
    Warren
    24.6%

    By share, of 21 with 30+ tests

Read a result for Atlantic County

Starts at Atlantic County's median, 0.3 pCi/L

0.3pCi/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

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Atlantic County's median reported result, 2022.

Interpret this reading

The data

Atlantic County, At a glance

Atlantic County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Atlantic County as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

USGS geologic potential: Low across 91% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Atlantic County, 2022

Share of reported tests at or above 4 pCi/L, by year, Atlantic County
Share of reported tests at or above 4 pCi/L, by year, Atlantic County
YearShare of reported tests at or above 4 pCi/L
20144.0%
20150.7%
20163.9%
20174.3%
20183.0%
20193.8%
20207.4%
20213.1%
20222.1%

2022: 2.1%. Across these years the share ran from 0.7% to 7.4%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 1,047 tests reported to CDC for Atlantic 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).

How to read these figures

Atlantic County, Compared

Atlantic County radon figures, compared

Calculated by Radon411

Only 22 of 1,047 radon tests reported for Atlantic County in 2022 reached 4 pCi/L (2.1%). 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 19.3 pCi/L.

Across 21 New Jersey counties pooled together, 9.7% of tests reached that level, so Atlantic County runs 7.6 points below its state. Against the national pool of 23.9%, the gap is 21.8 points lower. Its place in the state: 19th 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 2.1% share point the same way here. Of 6 neighbours with a figure, 4 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 0.0% (Cape May County) to 12.2% (Gloucester County).

Below the action level, 946 tests (90.4%) came in under 2 pCi/L, against 74.9% statewide, and 79 tests (7.5%) fell between 2 and 4, against 15.4% statewide. Over 9 years of annual figures the share held within 2 points, from 4.0% in 2014 to 2.1% in 2022; its peak was 7.4% in 2020. USGS geology rates 91% of the county's land low radon potential.

The busiest year on file was 2022, with 1,047 tests reported; the quietest, 2015, had 280.

Share of reported tests at or above 4 pCi/L by year, Atlantic County against New Jersey2014 to 2022, years with 30 or more tests: Atlantic County 4.0% to 2.1%, the state's pooled share 9.7% in 2022.
Atlantic CountyNew Jersey, pooled
Share of reported tests at or above 4 pCi/L by year, Atlantic County against New Jersey: data table
YearTestsAtlantic County, at or above 4 pCi/LNew Jersey, pooled
20143274.0%12.8%
20152800.7%12.5%
20163823.9%12.5%
20175984.3%11.9%
20185303.0%11.0%
20196633.8%11.2%
20208807.4%11.7%
20217373.1%10.3%
20221,0472.1%9.7%
Atlantic County against New Jersey, the United States and nearby counties, 2022
AreaTestsAt or above 4 pCi/LMedianDifference from Atlantic County
Atlantic County1,0472.1%0.3 pCi/LThis county
New Jersey, pooled21 counties, pooled108,9349.7%Not pooled+7.6 points
United States, pooled853 counties, pooled333,14023.9%Not pooled+21.8 points
Warren Countyhighest in the state2,81924.6%1.5 pCi/L+22.5 points
Hudson Countylowest in the state2,6553.4%0.5 pCi/L+1.3 points
Gloucester County, NJborders it3,33312.2%1.1 pCi/L+10.1 points
Cumberland County, NJborders it7528.6%0.9 pCi/L+6.5 points
Camden County, NJborders it6,7616.7%0.9 pCi/L+4.6 points
Burlington County, NJborders it5,3556.2%0.9 pCi/L+4.1 points
Ocean County, NJborders it2,6041.8%0.5 pCi/L−0.3 points
Cape May County, NJborders it2460.0%0.3 pCi/L−2.1 points
Where Atlantic County's reported results fell, 2022, beside New Jersey and the United States
ResultAtlantic County testsAtlantic County shareNew Jersey shareU.S. shareAgainst New Jersey
Under 2 pCi/L94690.4%74.9%54.5%+15.5 points
2 to 4 pCi/L797.5%15.4%21.7%−7.9 points
4 pCi/L and above222.1%9.7%23.9%−7.6 points
Atlantic County ranked among the 21 New Jersey counties with 30 or more tests, by share at or above 4 pCi/L, 2022
CountyRankTestsAt or above 4 pCi/LMedian
Passaic County11 of 214,8257.5%0.8 pCi/L
Middlesex County12 of 219,5947.3%0.8 pCi/L
Camden County13 of 216,7616.7%0.9 pCi/L
Burlington County14 of 215,3556.2%0.9 pCi/L
Bergen County15 of 2111,4406.1%1.0 pCi/L
Union County16 of 216,1115.1%0.9 pCi/L
Essex County17 of 218,3414.1%0.7 pCi/L
Hudson County18 of 212,6553.4%0.5 pCi/L
Atlantic County19 of 211,0472.1%0.3 pCi/L
Ocean County20 of 212,6041.8%0.5 pCi/L
Cape May County21 of 212460.0%0.3 pCi/L
Atlantic County radon tests by year, against New Jersey's pooled share
YearTestsAt or above 4 pCi/LMedianHighestNew Jersey, pooledChange from the row before
20221,0472.1%0.3 pCi/L19.3 pCi/L9.7%−1.0 points
20217373.1%0.6 pCi/L5.6 pCi/L10.3%−4.3 points
20208807.4%0.8 pCi/L23.6 pCi/L11.7%+3.6 points
20196633.8%0.6 pCi/L10.6 pCi/L11.2%+0.8 points
20185303.0%0.3 pCi/L22.2 pCi/L11.0%−1.3 points
20175984.3%0.4 pCi/L20.5 pCi/L11.9%+0.4 points
20163823.9%0.5 pCi/L14.6 pCi/L12.5%+3.2 points
20152800.7%0.5 pCi/L6.2 pCi/L12.5%−3.3 points
20143274.0%0.3 pCi/L11.5 pCi/L12.8%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Atlantic County, Geology

The ground under Atlantic County

Predicted

USGS's geologic map puts all of Atlantic County's mapped land in one class: low radon potential. 90.8% 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).

USGS's geologic areas under Atlantic County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Outer Coastal PlainUpper Tertiary-Quaternary gravel, sand, silt, clay.Low890.8%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Atlantic County beside the ground around it

Across New Jersey 29.8% of the land is rated high; none of Atlantic County's is. Of the 6 counties that border it, 3 have more moderate-potential ground, Gloucester County the most at 32.3%.

Share of land by USGS radon potential: Atlantic County, the 6 counties bordering it and New Jersey
AreaEPA zoneLow potentialModerate potentialHigh potential
Atlantic CountyZone 390.8%NoneNone
Burlington CountyZone 276.3%23.7%None
Cumberland CountyZone 299.9%NoneNone
Cape May CountyZone 393.4%NoneNone
Camden CountyZone 274.2%25.8%None
Gloucester CountyZone 267.7%32.3%None
Ocean CountyZone 383.9%NoneNone
New Jersey21 counties, pooled by land areaVaries53.8%13.8%29.8%

The map rates the ground, not the air in any home.

Local help

Atlantic County, Local resources

Radon testing and mitigation in Atlantic County

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

Atlantic County, Questions

Questions about radon in Atlantic County

Are radon levels high in Atlantic County?

In 2022, 2.1% of the radon tests reported to CDC for Atlantic 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, 18 reported a higher share; pooled, the state comes to 9.7%.

Which counties border Atlantic County?

Atlantic County borders 6 counties: Burlington County, Cumberland County, Cape May County, Camden County, Gloucester County and Ocean County.

Products

Atlantic County, Products

Testing a home in Atlantic County

In Atlantic County, 2.1% of 1,047 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 Atlantic County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Atlantic County homes, compared

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Atlantic County, Bordering counties

Counties bordering Atlantic County

Calculated by Radon411

Atlantic County, Cities and towns

Cities and towns in Atlantic County

The Census Bureau estimates 278,657 residents in Atlantic County for July 1, 2025, 4,465 more than in 2020 (+1.6%). That works out to 502 people per square mile of land. No town dominates: Atlantic City, the largest, has 38,787 residents, 13.9% of the total. Together its 17 incorporated places hold 52.8% of those residents; the other 47.2% live outside any of them. Reported testing is thin here: 1,047 tests over 2022, or 3.8 for every 1,000 residents (2025 estimate), where New Jersey as a whole comes to 11.4.

From Atlantic City to Corbin City, CDC publishes no figure by town: each reads Atlantic County's.

The 12 largest cities and towns in Atlantic County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Atlantic City38,787+1.0%13.9%
Pleasantville20,853+1.3%7.5%
Hammonton15,060+2.2%5.4%
Somers Point10,590+1.3%3.8%
Ventnor City9,345+1.7%3.4%
Absecon9,209+1.2%3.3%
Northfield8,496+0.6%3.0%
Brigantine7,658−0.6%2.7%
Linwood7,051+1.6%2.5%
Margate City5,194−2.0%1.9%
Buena4,529+0.4%1.6%
Egg Harbor City4,426+1.0%1.6%
  • Folsom
  • Estell Manor
  • Port Republic
  • Longport
  • Corbin City

17 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).

Atlantic County, Homes

Homes in Atlantic County

Of Atlantic County's 132,102 homes, 58% are detached houses, against 53% across New Jersey; 21% are in buildings of five or more homes. Much of Atlantic County is recent building: 20% of its homes have gone up since 2000 and the middle year built is 1977, against 1969 for New Jersey. 68% of occupied homes are lived in by their owner (New Jersey: 64%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Atlantic County, New Jersey, 2019 to 2023
HomesAtlantic CountyNew Jersey
Housing units132,1023,775,842
Detached houses58%53%
In buildings of 5 or more21%22%
Mobile homes3%1%
Built before 196030%38%
Built since 200020%15%
Middle year built19771969
Owner-occupied68%64%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.