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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
2022
* * * * * * 0 * *
2021
* * * * * * 0 * *
2020
* * * * * * 0 * *
2019
* * * * * * 0 * *
2018
* * * * * * 0 * *
2017
* * * * * * 0 * *
2016
* * * * * * 0 * *
2015
* * * * * * 0 * *
2014
* * * * * * 0 * *
2013
* * * * * * 0 * *
2012
* * * * * * 0 * *
2011
* * * * * * 0 * *
2010
* * * * * * 0 * *
2009
* * * * * * 0 * *
2008
* * * * * * 0 * *
2007
* * * * * * 0 * *
2006
* * * * * * 0 * *
2005
* * * * * * 0 * *
2004
* * * * * * 0 * *
2003
* * * * * * 0 * *
2002
0.08 * * * 0.09 0.004 9 0.02 *
2001
0.08 0.09 * 0.10 0.11 0.008 28 0.02 *
2000
0.07 0.09 0.095 0.12 0.14 0.016 29 0.02 73
1999
0.08 0.08 * 0.12 0.13 0.018 15 0.02 *
1998
0.09 0.11 * 0.15 0.17 0.025 29 0.02 *
1997
0.08 0.11 * 0.12 0.13 0.012 20 0.02 *
1996
0.06 0.08 0.077 0.09 0.10 0.008 31 0.02 59
1995
0.07 0.10 0.102 0.11 0.13 0.010 30 0.02 78
1994
0.08 0.11 * 0.13 0.13 0.020 22 0.02 *
1993
0.08 0.11 0.107 0.13 0.15 0.016 27 0.02 82
1992
0.10 0.11 * 0.13 0.14 0.010 22 0.02 *
1991
0.11 0.13 0.128 0.14 0.16 0.012 28 0.02 99
1990
0.10 0.13 0.127 0.14 0.15 0.010 27 0.02 97
1989
0.09 0.11 0.115 0.14 0.15 0.015 23 0.02 88
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.