Preliminary Regulatory Determinations for Contaminants on the Fourth Drinking Water Contaminant Candidate List (Draft)
Mar. 11, 2020
The Safe Drinking Water Act (SDWA) requires the Environmental Protection Agency (EPA) to make regulatory determinations every five years on at least five unregulated contaminants. The unregulated contaminants included in a regulatory determination are chosen from the Contaminant Candidate List (CCL), which the SDWA requires the EPA to publish every five years. The EPA published the fourth CCL in the Federal Register on 17 November 2016. This document presents the preliminary regulatory determinations and supporting rationale for the following eight of the 109 contaminants listed on CCL 4: (PFOS),(PFOA), 1,1-dichloroethane, acetochlor, methyl bromide (bromomethane), metolachlor, nitrobenzene, and (RDX). The Agency is making preliminary determinations to regulate two contaminants and to not regulate six contaminants The EPA seeks comment on these preliminary determinations. The EPA is also presenting an update on three other CCL 4 contaminants. Comments must be received on or before 11 May 2020. POC is Richard Weisman, Standards and Risk Management Division, Office of Ground Water and Drinking Water, MC: 4607M, Environmental Protection Agency, 1200 Pennsylvania Ave. NW; tele: (202) 564-2822; email: weisman.richard@epa.gov. (Federal Register: 10 March 2020 [Proposed Rule] Pages 14098-14142)

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