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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
2025
* * * * * * 0 * *
2024
* * * * * * 0 * *
2023
* * * * * * 0 * *
2022
0.14 0.34 * 0.82 2.2 0.583 11 0.1 *
2021
0.2 0.45 * 0.74 1.0 0.209 22 0.1 *
2020
0.17 * * * 0.24 0.029 5 0.1 *
2019
0.11 0.2 * 0.81 3.4 0.754 20 0.1 *
2018
0.11 0.24 * 0.4 0.51 0.116 20 0.1 *
2017
0.11 0.23 0.261 0.43 0.5 0.112 29 0.1 3
2016
0.1 0.32 0.338 0.59 0.91 0.192 31 0.1 3
2015
0.05 0.34 0.434 1.01 1.2 0.301 26 0.1 4
2014
0.21 0.46 * 0.78 0.85 0.21 23 0.1 *
2013
0.1 0.34 0.412 0.76 1.1 0.25 31 0.1 4
2012
0.05 0.29 0.354 0.59 1.0 0.216 29 0.1 4
2011
0.13 0.35 0.433 0.82 1.1 0.278 31 0.1 4
2010
0.14 0.42 0.721 1.08 9.1 1.64 29 0.1 7
2009
0.05 0.32 0.323 0.49 0.83 0.169 29 0.1 3
2008
0.05 0.33 0.433 0.81 1.0 0.255 29 0.1 4
2007
0.11 0.31 0.338 0.58 0.66 0.18 23 0.1 3
2006
0.05 0.28 * 0.55 0.85 0.189 25 0.1 *
2005
0.12 0.41 0.437 0.68 0.93 0.226 30 0.1 4
2004
0.18 0.42 0.504 0.72 2.0 0.377 24 0.1 5
2003
0.19 0.41 0.586 0.77 3.5 0.604 29 0.1 6
2002
0.14 0.5 * 1.0 1.2 0.326 23 0.1 *
2001
0.19 0.69 0.737 1.19 2.7 0.528 28 0.1 7
2000
0.5 0.5 0.68 1.5 1.6 0.39 29 1.0 7
1999
0.5 1.1 1.20 1.9 4.5 0.97 18 1.0 12
1998
0.5 0.5 0.80 1.3 2.5 0.54 29 1.0 8
1997
0.5 1.1 * 1.8 2.2 0.55 22 1.0 *
1996
0.5 1.1 1.10 1.8 3.3 0.67 28 1.0 11
1995
0.5 1.7 1.51 2.2 3.4 0.82 31 1.0 15
1994
0.5 1.1 1.06 1.9 2.6 0.68 30 1.0 10
1993
0.5 0.5 1.05 1.5 6.6 1.20 26 1.0 10
1992
0.5 0.5 0.68 1.3 1.9 0.41 31 1.0 7
1991
0.5 0.5 2.72 2.6 22 4.63 25 1.0 27
1990
0.5 1.4 1.28 2.0 2.6 0.63 28 1.0 13
1989
0.5 1.2 * 2.8 5.0 1.19 21 1.0 *
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.