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National Drinking Water Database


MTBE in Wisconsin


MTBE (methyl tert-butyl ether) is a fuel additive that had been used as an octane enhancer in unleaded gasoline; it contaminates groundwater due to spillage or leakage at gas stations, and has been banned or scheduled for phaseout in most states.

The Most Polluted Communities in Wisconsin

42 water utilities reported detecting MTBE in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average MTBE level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Browns Lake Mobile Home Ct
Burlington, WI
2255 of 524.78 ppb
(21.2 to 28.25 ppb)
2Roettgers Oil - Thiensville Mobil Mart
Thiensville, WI
521 of 113 ppb
(13 ppb)
3Edgerton Trading Llc
Edgerton, WI
6825 of 117.68 ppb
(0 to 23.5 ppb)
4Theresa Waterworks
Theresa, WI
1,3091 of 16 ppb
(6 ppb)
5Richfield Elementary School
Richfield, WI
41010 of 103.53 ppb
(1.2 to 5.1 ppb)
6Eglehoff Lawn
Thiensville, WI
501 of 13.5 ppb
(3.5 ppb)
7Dane Waterworks
Dane, WI
9543 of 32.93 ppb
(2.1 to 3.8 ppb)
8Luck Waterworks
Luck, WI
1,2251 of 12.9 ppb
(2.9 ppb)
9Waunakee Waterworks
Waunakee, WI
10,7559 of 91.12 ppb
(0.25 to 2.1 ppb)
10Sullivan Elementary School
Sullivan, WI
2601 of 10.97 ppb
(0.97 ppb)

Health Based Limits for MTBE

StandardDescriptionLevel
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.13 ppb

Violation Summary for MTBE in Wisconsin

There are no violations reported for this contaminant in Wisconsin