Radon levels in Long Island homes

Since 1987, radon has been detected at 96 out of 1,804 Long Island homes tested at or above levels at which federal regulators recommend steps be taken to monitor or remediate the situation, according to data provided by the state Health Department.

Radon, a radioactive gas that can damage lungs, is measured in picocuries per liter of air, or pCi/L. A reading of 4 pCi/L or more is cause for concern, according to the Environmental Protection Agency. Long Island is considered a low-risk area for elevated radon levels, and the 96 tests above the EPA recommendation represent 5.3% of the homes tested. Here are the results of tests in homes, broken down by city or towns, in picocuries per liter of air, or pCi/L. This database was updated on Oct. 29, 2019.

Percent of homes tested since 1987 exceeding radon level of 4 pCi/L

  • Up to 3%
  • Up to 7%
  • Up to 11%
  • Up to 15%
Town/village/city Test location in home # of homes tested Average radon level Highest level Tests between 4 and 20 Tests above 20 Tests above 4 as a %
Town/village/city Glen Cove Test location in home Basement # of homes tested 7 Average radon level 2.59 Highest level 5.5 Tests between 4 and 20 1 Tests above 20 0 Tests above 4 as a % 14.3%
Town/village/city Glen Cove Test location in home 1st Floor # of homes tested 5 Average radon level 0.82 Highest level 1.4 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Hempstead Test location in home Basement # of homes tested 379 Average radon level 1.23 Highest level 8.3 Tests between 4 and 20 11 Tests above 20 0 Tests above 4 as a % 2.9%
Town/village/city Hempstead Test location in home 1st Floor # of homes tested 123 Average radon level 0.62 Highest level 4.0 Tests between 4 and 20 1 Tests above 20 0 Tests above 4 as a % 0.8%
Town/village/city Long Beach Test location in home Basement # of homes tested 3 Average radon level 0.20 Highest level 0.4 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Long Beach Test location in home 1st Floor # of homes tested 4 Average radon level 0.45 Highest level 1.2 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city North Hempstead Test location in home Basement # of homes tested 187 Average radon level 1.65 Highest level 7.5 Tests between 4 and 20 16 Tests above 20 0 Tests above 4 as a % 8.6%
Town/village/city North Hempstead Test location in home 1st Floor # of homes tested 48 Average radon level 0.88 Highest level 3.0 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Oyster Bay Test location in home Basement # of homes tested 220 Average radon level 1.80 Highest level 13.9 Tests between 4 and 20 19 Tests above 20 0 Tests above 4 as a % 8.6%
Town/village/city Oyster Bay Test location in home 1st Floor # of homes tested 62 Average radon level 0.92 Highest level 12.6 Tests between 4 and 20 2 Tests above 20 0 Tests above 4 as a % 3.2%
Town/village/city Babylon Test location in home Basement # of homes tested 56 Average radon level 1.06 Highest level 5.5 Tests between 4 and 20 1 Tests above 20 0 Tests above 4 as a % 1.8%
Town/village/city Babylon Test location in home 1st Floor # of homes tested 18 Average radon level 0.78 Highest level 2.2 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Brookhaven Test location in home Basement # of homes tested 139 Average radon level 1.75 Highest level 7.5 Tests between 4 and 20 7 Tests above 20 0 Tests above 4 as a % 5.0%
Town/village/city Brookhaven Test location in home 1st Floor # of homes tested 82 Average radon level 0.80 Highest level 8.0 Tests between 4 and 20 2 Tests above 20 0 Tests above 4 as a % 2.4%
Town/village/city East Hampton Test location in home Basement # of homes tested 20 Average radon level 1.53 Highest level 4.7 Tests between 4 and 20 2 Tests above 20 0 Tests above 4 as a % 10.0%
Town/village/city East Hampton Test location in home 1st Floor # of homes tested 7 Average radon level 0.56 Highest level 1.2 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Huntington Test location in home Basement # of homes tested 152 Average radon level 2.13 Highest level 22.2 Tests between 4 and 20 17 Tests above 20 1 Tests above 4 as a % 11.8%
Town/village/city Huntington Test location in home 1st Floor # of homes tested 52 Average radon level 1.35 Highest level 10.8 Tests between 4 and 20 3 Tests above 20 0 Tests above 4 as a % 5.8%
Town/village/city Islip Test location in home Basement # of homes tested 66 Average radon level 1.19 Highest level 10.4 Tests between 4 and 20 3 Tests above 20 0 Tests above 4 as a % 4.5%
Town/village/city Islip Test location in home 1st Floor # of homes tested 33 Average radon level 0.60 Highest level 2.5 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Northport Test location in home Basement # of homes tested 4 Average radon level 1.43 Highest level 2.5 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Riverhead Test location in home Basement # of homes tested 11 Average radon level 2.05 Highest level 8.9 Tests between 4 and 20 1 Tests above 20 0 Tests above 4 as a % 9.1%
Town/village/city Riverhead Test location in home 1st Floor # of homes tested 1 Average radon level 3.20 Highest level 3.2 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Shelter Island Test location in home Basement # of homes tested 1 Average radon level 1.10 Highest level 1.1 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Smithtown Test location in home Basement # of homes tested 63 Average radon level 2.97 Highest level 42.6 Tests between 4 and 20 6 Tests above 20 2 Tests above 4 as a % 12.7%
Town/village/city Smithtown Test location in home 1st Floor # of homes tested 16 Average radon level 1.06 Highest level 3.9 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Southampton Test location in home Basement # of homes tested 24 Average radon level 0.99 Highest level 2.8 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Southampton Test location in home 1st Floor # of homes tested 14 Average radon level 0.42 Highest level 1.1 Tests between 4 and 20 0 Tests above 20 0 Tests above 4 as a % 0.0%
Town/village/city Southold Test location in home Basement # of homes tested 7 Average radon level 2.47 Highest level 8.6 Tests between 4 and 20 1 Tests above 20 0 Tests above 4 as a % 14.3%

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