These three entities have the role and responsibility to develop and implement the national pretreatment program:

• Approval authorities
  • Director in an NPDES authorized state with an approved state pretreatment program, and the appropriate EPA regional administrator in a non-NPDES authorized state or NPDES state without an approved state pretreatment program.
• Control authorities
  • The publicly owned treatment works (POTW), for a POTW with an approved pretreatment program, or the approval authority, for a POTW without an approved pretreatment program.
• Industrial users (IUs)
  • A nondomestic source of indirect discharge into a POTW.