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EPA/WATER RIN: 2040-AD58 Publication ID: Spring 2000 
Title: ●Unregulated Contaminant Monitoring Rule - List 2 
Abstract: The Office of Water will revise the National Primary Drinking Water Regulations for Unregulated Contaminant Monitoring to require monitoring for List 2 contaminants for which analytical methods and sampling locations must be specified. Promulgation of these methods and sampling locations will allow the unregulated contaminants on List 2 of the Unregulated Contaminant Monitoring Regulation (1999) List to be monitored beginning January 2001, along with monitoring for List 1 contaminants. Monitoring will be conducted at approximately 300 randomly selected public water systems, quarterly for one year beginning in 2001. Contaminants on List 2 include: 1,2-diphenylhydrazine; 2-methyl-phenol; 2,4-dichlorophenol; 2,4-dinitrophenol; 2,4,6-trichlorophenol; Alachlor ESA; Diazinon; Disulfoton; Diuron; Fonofos; Linuron; Polonium-210; Prometon; Terbufos; RDX; and Aeromonas (a microbiological contaminant). Methods are currently being developed for these contaminants. If a method is not ready at the time this rule is promulgated, the contaminant may be monitored at a later date when its method is available. 
Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 141.40   
Legal Authority: 42 USC 300f    42 USC 300g-1 to 300g-6    42 USC 300j-4    42 USC 300j-9    42 USC 300j-11   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  04/00/2000    
Final Action  12/00/2000    
Additional Information: SAN No. 4373
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State, Tribal 
Small Entities Affected: Businesses, Governmental Jurisdictions, Organizations  Federalism: No 
Included in the Regulatory Plan: No 
Sectors Affected: 22131 Water Supply and Irrigation Systems 
Agency Contact:
Charles Job
Environmental Protection Agency
Water
4606M,
Washington, DC 20460
Phone:202 564-3941
Fax:202 564-3756
Email: job.charles@epa.gov

Rachel Sakata
Environmental Protection Agency
Water
4607,
Phone:202 260-2527
Fax:202 260-3762