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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
2024
0.01 0.01 * 0.01 0.01 0.000 14 0.02 *
2023
0.01 0.01 0.010 0.01 0.01 0.000 29 0.02 0.3
2022
0.01 0.01 0.010 0.01 0.01 0.000 30 0.02 0.3
2021
0.01 0.01 * 0.01 0.03 0.005 23 0.02 *
2020
0.01 * * * 0.01 0.000 9 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 29 0.02 0.3
2016
0.01 0.01 0.010 0.01 0.01 0.000 30 0.02 0.3
2015
0.01 0.01 0.012 0.01 0.03 0.005 30 0.02 0.4
2014
0.01 0.01 0.010 0.01 0.01 0.000 30 0.02 0.3
2013
0.01 0.01 0.010 0.01 0.01 0.000 31 0.02 0.3
2012
0.01 0.01 0.011 0.01 0.04 0.006 29 0.02 0.3
2011
0.01 0.01 0.010 0.01 0.01 0.000 31 0.02 0.3
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 28 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 0.011 0.01 0.03 0.005 29 0.02 0.3
2006
0.01 0.01 0.013 0.02 0.05 0.010 30 0.02 0.4
2005
0.01 0.01 0.011 0.01 0.02 0.003 31 0.02 0.3
2004
0.01 0.01 0.013 0.02 0.04 0.007 30 0.02 0.4
2003
0.01 0.01 0.013 0.02 0.05 0.008 31 0.02 0.4
2002
0.01 0.01 * 0.04 0.06 0.016 16 0.02 *
2001
0.01 0.01 0.014 0.03 0.04 0.008 30 0.02 0.4
2000
0.01 0.03 0.026 0.04 0.09 0.017 28 0.02 0.8
1999
0.01 0.02 * 0.04 0.06 0.015 19 0.02 *
1998
0.01 0.01 * 0.06 0.13 0.027 28 0.02 *
1997
0.01 0.01 0.015 0.03 0.04 0.008 29 0.02 0.5
1996
0.01 0.03 0.028 0.05 0.07 0.016 31 0.02 0.9
1995
0.01 0.02 0.019 0.03 0.04 0.010 29 0.02 0.6
1994
0.01 0.01 0.018 0.04 0.06 0.013 30 0.02 0.6
1993
0.01 0.03 * 0.04 0.09 0.014 27 0.02 *
1992
0.01 0.02 0.031 0.05 0.19 0.045 31 0.02 1
1991
0.01 0.05 * 0.09 0.48 0.091 25 0.02 *
1990
0.01 0.04 * 0.05 0.08 0.015 27 0.02 *
1989
0.03 0.08 0.088 0.14 0.22 0.044 23 0.02 3
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.