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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
0.06 0.10 * 0.10 0.11 0.011 15 0.02 *
2013
0.07 0.08 0.084 0.09 0.10 0.006 29 0.02 64
2012
0.08 0.09 0.087 0.09 0.10 0.006 29 0.02 67
2011
0.08 0.09 0.087 0.10 0.10 0.007 27 0.02 67
2010
0.07 0.09 0.086 0.10 0.10 0.008 29 0.02 66
2009
* * * * * * 0 * *
2008
* * * * * * 0 * *
2007
* * * * * * 0 * *
2006
* * * * * * 0 * *
2005
* * * * * * 0 * *
2004
0.08 * * * 0.09 0.005 4 0.02 *
2003
0.07 0.09 * 0.10 0.12 0.011 25 0.02 *
2002
0.06 0.09 0.091 0.10 0.11 0.011 31 0.02 70
2001
0.07 0.09 0.086 0.09 0.10 0.007 30 0.02 66
2000
0.08 0.09 0.094 0.12 0.12 0.012 29 0.02 72
1999
0.08 0.08 * 0.09 0.11 0.009 13 0.02 *
1998
0.07 0.11 0.114 0.15 0.15 0.023 28 0.02 88
1997
0.09 0.11 * 0.12 0.15 0.016 20 0.02 *
1996
0.07 0.08 0.082 0.09 0.10 0.009 30 0.02 63
1995
0.08 0.10 0.104 0.11 0.12 0.009 31 0.02 80
1994
0.06 0.11 * 0.12 0.13 0.018 20 0.02 *
1993
0.09 0.10 * 0.13 0.15 0.014 29 0.02 *
1992
0.11 0.13 * 0.14 0.16 0.014 20 0.02 *
1991
0.10 0.14 0.133 0.15 0.15 0.013 23 0.02 102
1990
0.11 0.14 0.141 0.15 0.18 0.015 28 0.02 108
1989
0.08 * * * 0.15 0.021 10 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.