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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
0.06 0.08 * 0.10 0.11 0.012 20 0.02 *
2016
0.07 0.09 0.094 0.11 0.14 0.016 30 0.02 72
2015
0.07 0.09 0.098 0.12 0.13 0.014 30 0.02 75
2014
0.07 0.09 0.093 0.10 0.11 0.010 29 0.02 71
2013
0.04 0.08 0.081 0.09 0.10 0.010 31 0.02 62
2012
0.07 0.08 0.084 0.09 0.10 0.006 29 0.02 64
2011
0.06 0.09 0.086 0.10 0.10 0.010 28 0.02 66
2010
0.08 0.09 * 0.09 0.10 0.006 19 0.02 *
2009
* * * * * * 0 * *
2008
* * * * * * 0 * *
2007
* * * * * * 0 * *
2006
* * * * * * 0 * *
2005
* * * * * * 0 * *
2004
0.01 * * * 0.08 0.034 4 0.02 *
2003
0.01 0.09 0.090 0.11 0.12 0.019 29 0.02 69
2002
0.01 0.09 0.088 0.10 0.11 0.017 30 0.02 67
2001
0.07 0.09 0.089 0.10 0.10 0.007 31 0.02 68
2000
0.04 0.09 0.091 0.12 0.13 0.018 31 0.02 70
1999
0.06 0.08 * 0.11 0.12 0.018 12 0.02 *
1998
0.07 0.11 * 0.14 0.15 0.023 25 0.02 *
1997
0.08 0.11 * 0.13 0.16 0.021 21 0.02 *
1996
0.07 0.07 0.076 0.09 0.09 0.007 30 0.02 58
1995
0.06 0.09 * 0.10 0.10 0.013 12 0.02 *
1994
* * * * * * 0 * *
1993
* * * * * * 0 * *
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.