The Power of Information

National Drinking Water Database

MTBE in Indiana

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 Indiana

10 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
1Rockport Water
Rockport, IN
2,5004 of 711.54 ppb
(0 to 46 ppb)
2Tell City Water Department
Tell City, IN
9,3152 of 45.18 ppb
(0 to 12.1 ppb)
3Kouts Water Works
Kouts, IN
1,7381 of 54.6 ppb
(0 to 23 ppb)
4Ladoga Water Works
Ladoga, IN
1,2002 of 22.22 ppb
(1.94 to 2.5 ppb)
5Lacrosse Water Department
Lacrosse, IN
5471 of 10.89 ppb
(0.89 ppb)
6Hilltop Farms, L.P.
Peru, IN
1001 of 60.78 ppb
(0 to 4.7 ppb)
7Marion City Water Works
Marion, IN
31,5904 of 70.69 ppb
(0 to 1.5 ppb)
8Gas City Water Department
6,5001 of 20.5 ppb
(0 to 1 ppb)
9Lake Station Water Department
Lake Station, IN
13,9481 of 20.26 ppb
(0 to 0.53 ppb)
10South Bend Water Works
South Bend, IN
113,4001 of 240.01 ppb
(0 to 0.25 ppb)

Health Based Limits for MTBE

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 Indiana

There are no violations reported for this contaminant in Indiana