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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 * *
2022
0.005 0.01 * 0.01 0.02 0.004 11 0.01 *
2021
0.005 0.01 * 0.02 0.03 0.007 22 0.01 *
2020
0.005 * * * 0.02 0.008 5 0.01 *
2019
0.005 0.01 * 0.03 0.04 0.009 20 0.01 *
2018
0.005 0.02 * 0.04 0.09 0.019 20 0.01 *
2017
0.005 0.01 0.023 0.06 0.11 0.025 29 0.01 3
2016
0.005 0.02 0.023 0.05 0.06 0.016 31 0.01 3
2015
0.005 0.02 0.023 0.04 0.08 0.018 26 0.01 3
2014
0.01 0.02 * 0.05 0.07 0.016 24 0.01 *
2013
0.01 0.02 0.033 0.07 0.11 0.025 31 0.01 4
2012
0.005 0.03 0.031 0.05 0.07 0.016 29 0.01 4
2011
0.005 0.03 0.042 0.08 0.12 0.028 31 0.01 5
2010
0.005 0.03 0.046 0.09 0.17 0.039 29 0.01 5
2009
0.005 0.03 0.046 0.08 0.15 0.037 29 0.01 5
2008
0.02 0.04 0.044 0.08 0.11 0.026 29 0.01 5
2007
0.01 0.05 0.057 0.09 0.17 0.036 23 0.01 7
2006
0.01 0.06 * 0.13 0.33 0.066 25 0.01 *
2005
0.005 0.06 0.087 0.16 0.23 0.059 30 0.01 10
2004
0.03 0.08 0.088 0.12 0.23 0.046 24 0.01 10
2003
0.03 0.09 0.109 0.18 0.41 0.076 29 0.01 13
2002
0.03 0.14 * 0.31 0.40 0.102 23 0.01 *
2001
0.06 0.16 0.177 0.31 0.42 0.102 28 0.01 21
2000
0.08 0.15 0.187 0.32 0.54 0.107 29 0.01 22
1999
0.09 0.25 * 0.35 0.54 0.115 15 0.01 *
1998
0.01 0.23 0.232 0.44 0.50 0.136 28 0.01 27
1997
0.06 0.37 * 0.49 0.71 0.152 22 0.01 *
1996
0.12 0.37 0.502 0.91 1.5 0.315 28 0.01 58
1995
0.06 0.45 0.574 1.1 1.4 0.380 31 0.01 67
1994
0.03 0.42 0.503 0.87 2.0 0.425 30 0.01 58
1993
0.05 0.51 0.588 1.0 1.1 0.326 26 0.01 68
1992
0.20 0.51 0.536 0.81 1.0 0.209 31 0.01 62
1991
0.07 0.48 0.603 1.1 2.8 0.540 28 0.01 70
1990
0.24 0.48 0.551 0.94 1.1 0.256 29 0.01 64
1989
0.19 0.68 * 1.45 2.3 0.585 20 0.01 *
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.