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Annual Statewide Toxics Summary
Methyl tertiary-Butyl Ether
FAQs
parts per billion
Read About Estimated Risk
Year
Months
Present
Minimum
Median
Mean
90th
Percentile
Maximum
Standard
Deviation
Number of
Observations
Detection
Limit
Estimated
Risk
2023
*
*
*
*
*
*
0
*
*
2022
*
*
*
*
*
*
0
*
*
2021
*
*
*
*
*
*
0
*
*
2020
*
*
*
*
*
*
0
*
*
2019
*
*
*
*
*
*
0
*
*
2018
*
*
*
*
*
*
0
*
*
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
0.15
0.15
*
0.15
0.5
0.03
127
0.3
*
2003
0.15
0.15
0.50
1.1
3.8
0.55
506
0.3
3
2002
0.15
1.0
1.47
3.1
13
1.33
442
0.3
8
2001
0.15
1.1
1.43
2.9
8.0
1.09
488
0.3
8
2000
0.15
1.1
1.67
3.5
10
1.40
525
0.3
9
1999
0.15
1.4
*
4.2
10
1.75
524
0.3
*
1998
0.15
1.4
1.83
4.0
10
1.50
595
0.3
10
1997
0.4
2.3
*
5.9
13
2.25
241
0.3
*
1996
0.15
2.4
*
5.7
11.1
1.99
147
0.3
*
1995
*
*
*
*
*
*
0
*
*
1994
*
*
*
*
*
*
0
*
*
1993
*
*
*
*
*
*
0
*
*
1992
*
*
*
*
*
*
0
*
*
1991
*
*
*
*
*
*
0
*
*
1990
*
*
*
*
*
*
0
*
*
1989
*
*
*
*
*
*
0
*
*
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.
