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Carbon Tetrachloride
parts per billion
Read About New Estimated Risk
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
Estimated
Risk
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 * *
2001
* * * * * * 0 * *
2000
* * * * * * 0 * *
1999
0.08 * * * 0.13 0.020 9 0.02 *
1998
0.09 0.11 0.113 0.14 0.16 0.019 29 0.02 87
1997
0.08 0.11 * 0.12 0.13 0.013 21 0.02 *
1996
0.06 0.07 0.074 0.08 0.09 0.007 31 0.02 57
1995
0.07 0.09 0.094 0.10 0.12 0.010 30 0.02 72
1994
0.08 0.12 * 0.13 0.13 0.017 18 0.02 *
1993
0.09 0.11 0.112 0.13 0.15 0.015 27 0.02 86
1992
0.11 0.11 * 0.13 0.14 0.008 22 0.02 *
1991
0.11 0.13 0.132 0.14 0.23 0.021 30 0.02 101
1990
0.10 0.13 0.128 0.14 0.15 0.010 30 0.02 99
1989
0.09 0.12 0.121 0.14 0.15 0.015 24 0.02 93
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.