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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
0.01 0.01 0.011 0.01 0.09 0.007 404 0.02 0.3
2016
0.01 0.01 0.014 0.03 0.11 0.012 419 0.02 0.4
2015
0.01 0.01 0.013 0.02 0.13 0.012 412 0.02 0.4
2014
0.01 0.01 0.019 0.02 2.6 0.132 387 0.02 0.6
2013
0.01 0.01 0.013 0.01 0.20 0.014 469 0.02 0.4
2012
0.01 0.01 0.013 0.01 0.19 0.013 467 0.02 0.4
2011
0.01 0.01 0.020 0.03 0.75 0.058 490 0.02 0.6
2010
0.01 0.01 0.014 0.02 0.22 0.015 473 0.02 0.4
2009
0.01 0.01 0.014 0.02 0.18 0.013 522 0.02 0.4
2008
0.01 0.01 0.017 0.02 1.1 0.050 518 0.02 0.5
2007
0.01 0.01 0.017 0.03 0.18 0.018 495 0.02 0.5
2006
0.01 0.01 0.021 0.04 0.34 0.029 504 0.02 0.6
2005
0.01 0.01 0.030 0.06 0.87 0.063 510 0.02 0.9
2004
0.01 0.01 0.023 0.04 0.60 0.039 503 0.02 0.7
2003
0.01 0.01 0.027 0.05 0.58 0.041 503 0.02 0.8
2002
0.01 0.01 0.025 0.05 0.23 0.028 459 0.02 0.8
2001
0.01 0.01 0.043 0.06 1.7 0.113 499 0.02 1
2000
0.01 0.02 0.058 0.08 2.4 0.155 497 0.02 2
1999
0.01 0.01 * 0.06 5.0 0.307 429 0.02 *
1998
0.01 0.01 0.031 0.06 1.3 0.073 520 0.02 1
1997
0.01 0.01 0.033 0.07 1.1 0.077 557 0.02 1
1996
0.01 0.01 0.034 0.05 2.5 0.119 626 0.02 1
1995
0.01 0.01 0.035 0.06 2.4 0.113 616 0.02 1
1994
0.01 0.01 0.047 0.06 8.7 0.361 607 0.02 1
1993
0.01 0.01 0.036 0.05 0.84 0.067 589 0.02 1
1992
0.01 0.03 0.061 0.13 1.3 0.105 598 0.02 2
1991
0.01 0.05 0.086 0.17 4.2 0.210 566 0.02 3
1990
0.01 0.05 0.115 0.20 11 0.518 570 0.02 4
1989
0.01 0.10 0.183 0.42 2.7 0.270 442 0.02 6
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.