Evaluation of Specific Requirements for Unfiltered Surface Water Supplies

摘要

The Amendments to the Safe Drinking Water Act passed in June 1986 (PL 99-339) require that the United States Environmental Protection Agency (USEPA) promulgate a National Primary Drinking Water Regulation (NPDWR) by December 1987, specifying criteria under which filtration (including pretreatment, coagulation and sedimentation as appropriate) would be required as a treatment technique for public water systems supplied by surface water sources. The proposed Surface Water Treatment Rule (SWTR), developed to comply with this requirement, includes conditions for which filtration would be required as a treatment technique for systems utilizing a surface water source, as well as conditions for which disinfection alone would be the only required treatment. The purpose of the report is to evaluate the criteria presented in the proposed SWTR (52 Federal Register 42 178, November 3, 1987) and the draft Guidance Manual (October 8, 1987) which pertain to avoiding filtration.