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Carbon Tetrachloride
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 * *
2021
* * * * * * 0 * *
2020
* * * * * * 0 * *
2019
* * * * * * 0 * *
2018
* * * * * * 0 * *
2017
* * * * * * 0 * *
2016
* * * * * * 0 * *
2015
* * * * * * 0 * *
2014
* * * * * * 0 * *
2013
0.07 0.08 0.083 0.09 0.10 0.008 30 0.02 64
2012
0.07 0.08 0.085 0.09 0.10 0.007 30 0.02 65
2011
0.05 0.09 0.087 0.10 0.11 0.010 29 0.02 67
2010
0.08 0.09 0.091 0.10 0.10 0.006 29 0.02 70
2009
* * * * * * 0 * *
2008
* * * * * * 0 * *
2007
* * * * * * 0 * *
2006
* * * * * * 0 * *
2005
* * * * * * 0 * *
2004
0.08 * * * 0.10 0.008 4 0.02 *
2003
0.07 0.09 0.093 0.11 0.11 0.010 29 0.02 71
2002
0.08 0.09 0.093 0.10 0.11 0.008 29 0.02 71
2001
0.07 0.09 0.086 0.09 0.10 0.006 30 0.02 66
2000
0.08 0.09 0.095 0.11 0.13 0.011 28 0.02 73
1999
0.07 0.08 * 0.11 0.12 0.014 13 0.02 *
1998
0.09 0.11 * 0.15 0.17 0.024 21 0.02 *
1997
0.07 0.11 * 0.12 0.15 0.019 17 0.02 *
1996
0.05 0.08 0.078 0.09 0.10 0.009 30 0.02 60
1995
0.07 0.10 0.100 0.11 0.13 0.011 29 0.02 77
1994
0.07 0.10 * 0.12 0.13 0.018 18 0.02 *
1993
0.07 0.10 * 0.12 0.15 0.016 25 0.02 *
1992
0.10 0.11 * 0.14 0.15 0.014 19 0.02 *
1991
0.10 0.13 0.125 0.14 0.18 0.015 28 0.02 96
1990
0.11 0.13 0.131 0.14 0.15 0.009 31 0.02 101
1989
0.08 0.11 0.113 0.13 0.14 0.015 24 0.02 87
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.