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Westchester County (North and South)
Indoor Radon Estimates
Percent Homes Above 4 pCi/L
June 1999

Town or City
homes
measured
living area*
basement**
best
estimate
(%)
range #
(%)
best
estimate
(%)
range #
(%)
Bedford town 81 3 (2 - 4) 16 (13 - 19)
Cortlandt town 156 9 (7 - 10) 29 (26 - 31)
Eastchester town 52 3 (2 - 5) 17 (14 - 21)
Greenburgh town 223 2.1 (1.7 - 2.6) 13 (11 - 14)
Harrison town 59 4 (3 - 5) 22 (18 - 25)
Lewisboro town 56 6 (4 - 8) 27 (22 - 31)
Mamaroneck town 92 6 (4 - 7) 27 (23 - 30)
Mount Kisco town 29 3 (2 - 5) 18 (13 - 22)
Mount Pleasant town 136 2.3 (1.8 - 2.9) 14 (12 - 16)
Mount Vernon city 35 4 (3 - 6) 22 (17 - 28)
New Castle town 127 2.5 (1.9 - 3.2) 15 (12 - 17)
New Rochelle city 122 2.1 (1.6 - 2.7) 13 (10 - 15)
North Castle town 54 6 (4 - 8) 27 (23 - 31)
North Salem town 28 6 (4 - 9) 26 (21 - 32)
Ossining town 75 3 (2 - 4) 15 (12 - 18)
Peekskill city 22 5 (3 - 7) 25 (19 - 31)
Pelham town 21 3 (2 - 5) 18 (13 - 23)
Pound Ridge town 23 10 (6 - 14) 30 (25 - 36)
Rye city 37 3 (2 - 4) 17 (13 - 21)
Rye town 55 4 (3 - 5) 20 (16 - 23)
Scarsdale town 93 2.3 (1.6 - 2.9) 13 (10 - 16)
Somers town 57 5 (4 - 7) 27 (22 - 31)
White Plains city 104 1.4 (0.9 - 2.0) 10 (8 - 12)
Yonkers city 136 3 (2 - 4) 15 (13 - 17)
Yorktown town 159 3.4 (2.7 - 4.3) 19 (16 - 22)
           
Westchester county 2032 4   18  

* Long-term measurement, 90 days to one year.

**Short-term measurement, typically 2 to 7 days.

# Uncertainty range of one sigma corresponds to a 68% confidence interval.


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New York State Department of Health - Wadsworth Center

Revised: June 2001