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Perchloroethylene
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
0.005 0.005 * 0.02 0.04 0.009 20 0.01 *
2022
0.005 0.005 * 0.02 0.05 0.012 19 0.01 *
2021
0.005 0.005 * 0.005 0.01 0.001 17 0.01 *
2020
0.005 * * * 0.01 0.004 7 0.01 *
2019
0.005 0.005 0.008 0.02 0.02 0.005 29 0.01 0.9
2018
0.005 0.005 0.007 0.01 0.02 0.003 31 0.01 0.8
2017
0.005 0.005 0.008 0.01 0.06 0.010 30 0.01 1
2016
0.005 0.005 0.011 0.01 0.09 0.016 31 0.01 1
2015
0.005 0.005 0.009 0.02 0.05 0.009 30 0.01 1
2014
0.005 0.005 0.009 0.02 0.02 0.006 30 0.01 1
2013
0.005 0.005 0.008 0.02 0.03 0.005 31 0.01 1
2012
0.005 0.005 0.009 0.02 0.03 0.007 29 0.01 1
2011
* * * * * * 0 * *
2010
* * * * * * 0 * *
2009
* * * * * * 0 * *
2008
* * * * * * 0 * *
2007
* * * * * * 0 * *
2006
* * * * * * 0 * *
2005
* * * * * * 0 * *
2004
* * * * * * 0 * *
2003
* * * * * * 0 * *
2002
* * * * * * 0 * *
2001
* * * * * * 0 * *
2000
* * * * * * 0 * *
1999
* * * * * * 0 * *
1998
* * * * * * 0 * *
1997
* * * * * * 0 * *
1996
* * * * * * 0 * *
1995
* * * * * * 0 * *
1994
* * * * * * 0 * *
1993
* * * * * * 0 * *
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.