Radon levels in Long Island homes

Since 1987, radon has been detected at 92 out of 1,764 Long Island homes tested at levels 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 litre 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 92 tests above the EPA recommendation represent 5.2 percent of the homes tested. Here are the results of tests in homes, broken down by city or townships, in picocuries per litre of air, or pCi/L

Percent of homes tested since 1987 exceeding radon level of 4

  • 0
  • Up to 7%
  • Up to 10%
  • 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 375 Average radon level 1.22 Highest level 8.3 Tests between 4 and 20 10 Tests above 20 0 Tests above 4 as a % 2.7%
Town/village/city Hempstead Test location in home 1st Floor # of homes tested 122 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 N. Hempstead Test location in home Basement # of homes tested 184 Average radon level 1.65 Highest level 7.5 Tests between 4 and 20 16 Tests above 20 0 Tests above 4 as a % 8.7%
Town/village/city N. Hempstead Test location in home 1st Floor # of homes tested 47 Average radon level 0.90 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 216 Average radon level 1.81 Highest level 13.9 Tests between 4 and 20 19 Tests above 20 0 Tests above 4 as a % 8.8%
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 54 Average radon level 1.07 Highest level 5.5 Tests between 4 and 20 1 Tests above 20 0 Tests above 4 as a % 1.9%
Town/village/city Babylon Test location in home 1st Floor # of homes tested 17 Average radon level 0.82 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 129 Average radon level 1.63 Highest level 7.5 Tests between 4 and 20 4 Tests above 20 0 Tests above 4 as a % 3.1%
Town/village/city Brookhaven Test location in home 1st Floor # of homes tested 74 Average radon level 0.86 Highest level 8.0 Tests between 4 and 20 2 Tests above 20 0 Tests above 4 as a % 2.7%
Town/village/city E. 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 E. 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 150 Average radon level 2.14 Highest level 22.2 Tests between 4 and 20 17 Tests above 20 1 Tests above 4 as a % 12.0%
Town/village/city Huntington Test location in home 1st Floor # of homes tested 50 Average radon level 1.39 Highest level 10.8 Tests between 4 and 20 3 Tests above 20 0 Tests above 4 as a % 6.0%
Town/village/city Islip Test location in home Basement # of homes tested 65 Average radon level 1.18 Highest level 10.4 Tests between 4 and 20 3 Tests above 20 0 Tests above 4 as a % 4.6%
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 62 Average radon level 3.00 Highest level 42.6 Tests between 4 and 20 6 Tests above 20 2 Tests above 4 as a % 12.9%
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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