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EPA/WATER RIN: 2040-AD54 Publication ID: Spring 2009 
Title: National Secondary Drinking Water Regulations (NSDWR): Methyl Tertiary Butyl Ether (MTBE) and Technical Corrections to the NSDWR 
Abstract: Methyl Tertiary Butyl Ether (MTBE) is an automobile fuel additive, introduced in the late 1970s during lead phase-out as an octane enhancer. It has been used in increasing quantity in the 1990s to meet the requirement of the federal Reformulated Gasoline (RFG) and Oxyfuels programs required by the Clean Air Act Amendments of 1990. However, MTBE has been detected in ground water and drinking water in a number of states due to leaking underground storage tanks and leaking pipelines. Although most of these detections are at levels well below health concern, MTBE's distinctive turpentine-like taste and odor can be detected at low levels. Presently, the Agency is revising the health assessment for MTBE. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Long-Term Actions 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 143 (Revision)   
Legal Authority: 42 USC 300f et seq   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  To Be Determined    
Final Action  To Be Determined    
Additional Information: SAN No. 4404
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
Sectors Affected: 22131 Water Supply and Irrigation Systems 
RIN Data Printed in the FR: No 
Agency Contact:
Irene Dooley
Environmental Protection Agency
Water
4607M,
Washington, DC 20460
Phone:202 564-4699
Fax:202 564-3760
Email: Dooley.Irene@epamail.epa.gov