These guidance documents support the Surface Water Treatment Rules and the treatment requirements for public water systems complying with those rules. These documents provide guidance for public water systems that need to consider changes to their treatment processes to ensure compliance with requirements of the suite of Surface Water Treatment Rules including the Long Term 2 Enhanced Surface Water Treatment Rule and Stage 2 Disinfectants and Disinfection Byproducts Rule.

• Turbidity Provisions (PDF)(144 pp, 3 MB, July 2020, 815-R-20-004)
  EPA provides guidance documents to help states and public water systems (PWSs) implement the Stage 1 and Stage 2 Disinfectants and Disinfection Byproducts (DBP) Rules. The materials below can assist in complying with requirements of these Rules including updates to reflect the Stage 2 DBP Rule.