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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 * 0.09 0.09 0.006 22 0.02 *
2012
0.08 0.08 0.084 0.09 0.10 0.005 29 0.02 65
2011
0.07 0.09 0.088 0.10 0.10 0.009 30 0.02 67
2010
0.07 0.09 0.088 0.10 0.10 0.008 26 0.02 67
2009
* * * * * * 0 * *
2008
* * * * * * 0 * *
2007
* * * * * * 0 * *
2006
* * * * * * 0 * *
2005
* * * * * * 0 * *
2004
0.08 * * * 0.09 0.005 4 0.02 *
2003
0.08 0.09 0.092 0.11 0.11 0.009 26 0.02 71
2002
0.07 0.09 0.092 0.10 0.11 0.009 26 0.02 70
2001
0.07 0.09 * 0.10 0.10 0.007 26 0.02 *
2000
0.09 0.09 0.097 0.12 0.13 0.013 28 0.02 74
1999
0.08 * * * 0.12 0.016 9 0.02 *
1998
0.09 0.11 0.118 0.15 0.17 0.022 30 0.02 91
1997
0.09 0.11 * 0.12 0.15 0.015 22 0.02 *
1996
0.07 0.08 * 0.08 0.09 0.005 22 0.02 *
1995
0.07 0.10 0.099 0.11 0.13 0.010 31 0.02 76
1994
0.07 0.11 * 0.12 0.13 0.017 19 0.02 *
1993
0.08 0.10 * 0.12 0.15 0.015 29 0.02 *
1992
0.11 0.12 * 0.14 0.15 0.012 20 0.02 *
1991
0.11 0.13 0.129 0.15 0.15 0.013 28 0.02 99
1990
0.11 0.14 0.139 0.15 0.20 0.016 31 0.02 107
1989
0.08 0.12 * 0.15 0.16 0.021 19 0.02 *
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.