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Methylene Chloride
parts per billion
Read About Estimated Risk
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
Estimated
Risk
2023
* * * * * * 0 * *
2022
* * * * * * 0 * *
2021
* * * * * * 0 * *
2020
* * * * * * 0 * *
2019
* * * * * * 0 * *
2018
* * * * * * 0 * *
2017
* * * * * * 0 * *
2016
* * * * * * 0 * *
2015
* * * * * * 0 * *
2014
* * * * * * 0 * *
2013
* * * * * * 0 * *
2012
0.14 * * * 0.14 0.053 1 0.1 *
2011
0.05 0.05 0.095 0.17 0.2 0.053 30 0.1 0.9
2010
0.05 0.05 0.087 0.18 0.25 0.063 30 0.1 0.9
2009
0.05 0.12 0.141 0.25 0.67 0.133 32 0.1 1
2008
0.05 0.05 0.113 0.25 0.27 0.077 31 0.1 1
2007
0.05 0.11 0.118 0.26 0.4 0.096 29 0.1 1
2006
0.05 0.13 0.142 0.22 0.34 0.071 31 0.1 1
2005
0.05 0.15 0.146 0.29 0.38 0.094 34 0.1 1
2004
0.05 0.12 0.135 0.29 0.37 0.098 30 0.1 1
2003
0.05 0.12 0.151 0.29 0.34 0.089 31 0.1 1
2002
0.05 0.19 0.242 0.71 0.82 0.231 31 0.1 2
2001
0.5 0.05 0.266 0.25 0.41 0.192 30 0.1 3
2000
0.5 0.5 0.50 0.5 0.5 0.00 30 1.0 5
1999
0.5 0.5 * 0.5 0.5 0.00 21 1.0 *
1998
0.5 0.5 * 0.5 0.5 0.00 15 1.0 *
1997
0.5 0.5 0.52 0.5 1.3 0.15 29 1.0 5
1996
0.5 0.5 0.50 0.5 0.5 0.00 31 1.0 5
1995
0.5 0.5 0.58 1.1 1.3 0.24 30 1.0 6
1994
0.5 0.5 0.59 0.5 3.1 0.47 31 1.0 6
1993
0.5 0.5 0.69 0.5 4.2 0.70 30 1.0 7
1992
0.5 0.5 0.54 0.5 2.1 0.29 30 1.0 5
1991
0.5 0.5 0.62 0.5 3.3 0.56 30 1.0 6
1990
0.5 0.5 * 1.4 3.7 0.72 24 1.0 *
1989
* * * * * * 0 * *
Graph It!
Notes Values below the Limit of Detection (LoD) assumed to be ½ LoD.
Means and risks shown only for years with data in all 12 months.
"*" means there was insufficient or no data available to determine the value.