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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
0.07 0.08 0.086 0.10 0.11 0.011 27 0.02 66
2016
0.06 0.09 0.093 0.11 0.14 0.016 31 0.02 72
2015
0.08 0.10 0.096 0.11 0.13 0.011 30 0.02 73
2014
0.07 0.09 0.093 0.10 0.10 0.008 29 0.02 71
2013
0.06 0.08 0.082 0.09 0.12 0.011 31 0.02 63
2012
0.05 0.09 0.083 0.09 0.10 0.009 30 0.02 63
2011
0.07 0.09 0.089 0.10 0.14 0.012 31 0.02 69
2010
0.07 0.09 0.085 0.10 0.10 0.008 27 0.02 65
2009
* * * * * * 0 * *
2008
* * * * * * 0 * *
2007
* * * * * * 0 * *
2006
* * * * * * 0 * *
2005
* * * * * * 0 * *
2004
0.08 * * * 0.09 0.006 3 0.02 *
2003
0.08 0.09 0.093 0.11 0.12 0.013 30 0.02 71
2002
0.08 0.09 0.093 0.10 0.11 0.008 30 0.02 71
2001
0.07 0.09 0.087 0.09 0.12 0.009 29 0.02 67
2000
0.05 0.09 0.094 0.12 0.13 0.016 28 0.02 72
1999
0.08 0.08 * 0.09 0.09 0.004 11 0.02 *
1998
0.10 0.13 * 0.14 0.15 0.014 16 0.02 *
1997
0.08 0.11 * 0.12 0.12 0.012 21 0.02 *
1996
0.06 0.08 0.077 0.08 0.09 0.007 30 0.02 59
1995
0.07 0.10 0.099 0.11 0.12 0.011 30 0.02 76
1994
0.06 0.11 * 0.12 0.13 0.017 20 0.02 *
1993
0.09 0.10 * 0.11 0.11 0.008 20 0.02 *
1992
* * * * * * 0 * *
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.