MtBE has been used as an octane enhancer in gasoline since the late 1970's. The additive burns gasoline more cleanly and reduces carbon monoxide and ozone levels. A known concern with MtBE in drinking water is the objectionable turpentine-like taste and odor the chemical can produce. The taste and odor problems are typically present long before MtBE levels in the water reach amounts that are considered a health hazard.
So far, Charlotte-Mecklenburg Utilities has detected only trace levels of MtBE -- levels of less than 1 part per billion (ppb). [One part per billion is equivalent to one penny out of $10,000,000.] While the source is still unclear it is quite possible boat motors, personal watercraft and storm water runoff are leading factors.
There is no EPA regulatory standard for MtBE. However, an EPA advisory level has been set at 20 ppb, and a state action level has been established at 11.6 ppb. Studies suggest taste and odor can become a problem at level of 2.5 ppb or greater.
Based on the low levels of MtBE we have found so far, this is a concern but not a significant health issue at this time. We will continue to address the issue by increasing MtBE testing and exploring additional treatment techniques to remove MtBE through the water treatment process.
For more information, contact the EPA Safe Drinking Water Hotline at 1-800-426-4791 or the City/County Customer Service and Information Center at 704/336-7600.
More Information About MtBE
