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Trichloroethylene
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
0.01 0.01 * 0.01 0.01 0.000 20 0.02 *
2022
0.01 0.01 0.010 0.01 0.01 0.000 31 0.02 0.3
2021
0.01 0.01 * 0.01 0.01 0.000 23 0.02 *
2020
0.01 * * * 0.01 0.000 7 0.02 *
2019
0.01 0.01 0.010 0.01 0.01 0.000 30 0.02 0.3
2018
0.01 0.01 0.010 0.01 0.01 0.000 31 0.02 0.3
2017
0.01 0.01 0.010 0.01 0.01 0.000 30 0.02 0.3
2016
0.01 0.01 0.013 0.01 0.06 0.010 30 0.02 0.4
2015
0.01 0.01 0.011 0.01 0.04 0.005 30 0.02 0.3
2014
0.01 0.01 0.010 0.01 0.02 0.002 30 0.02 0.3
2013
0.01 0.01 0.011 0.01 0.03 0.004 31 0.02 0.3
2012
0.01 0.01 0.010 0.01 0.02 0.002 30 0.02 0.3
2011
0.01 0.01 0.019 0.01 0.22 0.038 31 0.02 0.6
2010
0.01 0.01 0.010 0.01 0.01 0.000 29 0.02 0.3
2009
0.01 0.01 0.010 0.01 0.01 0.000 31 0.02 0.3
2008
0.01 0.01 0.010 0.01 0.01 0.000 31 0.02 0.3
2007
0.01 0.01 0.010 0.01 0.01 0.000 30 0.02 0.3
2006
0.01 0.01 0.010 0.01 0.01 0.000 30 0.02 0.3
2005
0.01 0.01 0.011 0.01 0.03 0.004 31 0.02 0.3
2004
0.01 0.01 0.011 0.01 0.03 0.004 30 0.02 0.3
2003
0.01 0.01 0.010 0.01 0.01 0.000 31 0.02 0.3
2002
0.01 0.01 0.016 0.02 0.10 0.020 30 0.02 0.5
2001
0.01 0.01 0.011 0.01 0.03 0.004 29 0.02 0.3
2000
0.01 0.01 0.014 0.02 0.04 0.009 28 0.02 0.4
1999
0.01 0.01 * 0.01 0.02 0.003 19 0.02 *
1998
0.01 0.01 * 0.01 0.01 0.000 16 0.02 *
1997
0.01 0.01 0.011 0.01 0.03 0.005 29 0.02 0.3
1996
0.01 0.01 0.020 0.03 0.24 0.042 30 0.02 0.6
1995
0.01 0.02 0.022 0.03 0.04 0.010 30 0.02 0.7
1994
0.01 0.01 0.014 0.03 0.05 0.010 31 0.02 0.4
1993
0.01 0.01 * 0.01 0.01 0.000 21 0.02 *
1992
* * * * * * 0 * *
1991
* * * * * * 0 * *
1990
* * * * * * 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.