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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 * *
2012
0.08 0.08 * 0.09 0.09 0.005 12 0.02 *
2011
0.07 0.09 0.087 0.09 0.10 0.007 30 0.02 67
2010
0.07 0.09 0.087 0.09 0.10 0.007 30 0.02 67
2009
* * * * * * 0 * *
2008
* * * * * * 0 * *
2007
* * * * * * 0 * *
2006
* * * * * * 0 * *
2005
* * * * * * 0 * *
2004
0.08 * * * 0.09 0.006 3 0.02 *
2003
0.06 0.09 0.093 0.11 0.12 0.013 31 0.02 71
2002
0.07 0.08 0.087 0.10 0.11 0.011 30 0.02 67
2001
0.08 0.09 0.088 0.09 0.12 0.008 31 0.02 68
2000
0.08 0.09 * 0.12 0.12 0.012 24 0.02 *
1999
0.08 * * * 0.12 0.017 9 0.02 *
1998
0.08 0.12 * 0.14 0.16 0.021 27 0.02 *
1997
0.08 0.11 * 0.12 0.13 0.011 20 0.02 *
1996
0.07 0.08 0.079 0.09 0.10 0.008 31 0.02 61
1995
0.08 0.10 0.100 0.11 0.12 0.009 30 0.02 77
1994
0.07 0.12 * 0.12 0.13 0.018 20 0.02 *
1993
0.09 0.11 0.108 0.12 0.15 0.014 27 0.02 83
1992
0.10 * * * 0.12 0.007 7 0.02 *
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.