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Chloroform
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 0.03 * 0.04 0.06 0.013 20 0.02 *
2022
0.01 0.03 0.028 0.04 0.05 0.010 29 0.02 2
2021
0.01 0.03 * 0.05 0.06 0.013 22 0.02 *
2020
0.01 * * * 0.04 0.012 7 0.02 *
2019
0.01 0.03 * 0.04 0.06 0.011 26 0.02 *
2018
* * * * * * 0 * *
2017
0.02 0.04 * 0.04 0.06 0.009 20 0.02 *
2016
0.01 0.04 0.048 0.08 0.10 0.022 30 0.02 4
2015
0.02 0.05 * 0.06 0.08 0.016 25 0.02 *
2014
0.01 0.04 0.040 0.06 0.09 0.017 28 0.02 3
2013
0.01 0.04 0.036 0.06 0.07 0.013 31 0.02 3
2012
0.01 0.04 0.045 0.05 0.33 0.055 30 0.02 3
2011
0.01 0.03 0.033 0.06 0.07 0.017 31 0.02 2
2010
0.01 0.04 0.036 0.05 0.07 0.015 31 0.02 3
2009
0.01 0.03 * 0.04 0.06 0.014 27 0.02 *
2008
0.01 0.03 0.033 0.05 0.06 0.013 30 0.02 3
2007
0.01 0.03 0.035 0.05 0.08 0.016 30 0.02 3
2006
0.01 0.04 0.034 0.05 0.06 0.014 29 0.02 3
2005
0.01 0.04 0.048 0.06 0.46 0.078 31 0.02 4
2004
0.02 0.04 0.041 0.06 0.07 0.015 30 0.02 3
2003
0.01 0.05 0.047 0.07 0.08 0.018 30 0.02 4
2002
0.02 0.04 * 0.05 0.06 0.012 26 0.02 *
2001
0.01 0.03 0.033 0.05 0.08 0.016 31 0.02 3
2000
0.01 0.03 0.034 0.05 0.09 0.018 30 0.02 3
1999
0.01 0.03 0.031 0.07 0.08 0.022 26 0.02 2
1998
0.01 0.04 * 0.05 0.08 0.018 13 0.02 *
1997
0.02 * * * 0.02 0.038 1 0.02 *
1996
0.01 0.04 0.042 0.07 0.19 0.038 31 0.02 3
1995
0.01 0.03 0.031 0.05 0.07 0.019 31 0.02 2
1994
0.01 0.02 0.022 0.03 0.05 0.011 31 0.02 2
1993
0.01 0.03 0.028 0.04 0.07 0.014 29 0.02 2
1992
0.01 0.02 0.025 0.06 0.07 0.018 30 0.02 2
1991
0.01 0.03 0.026 0.06 0.06 0.018 29 0.02 2
1990
0.01 0.02 0.020 0.03 0.07 0.013 28 0.02 1
1989
0.01 0.03 0.025 0.04 0.05 0.013 24 0.02 2
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.