MTBE

Methyl-t-butyl ether (MTBE) is a member of a group of chemicals generally called fuel oxygenates. MTBE is typically added to unleaded gasoline to reduce its carbon monoxide and ozone content. MTBE makes its way into drinking water through several sources, including leakage of underground storage tanks, fuel spills, emissions from marine engines, and, to a small extent, condensation of exhaust fumes. Because MTBE is a relatively new contaminant, the EPA is currently conducting tests to clarify the potential health effects of ingesting MTBE in drinking water.