Guidance on Major/Minor Designation for NPDES Facilities in Region 10

The documents below provide guidance and instructions for processing changes to major and minor designations for new and existing National Pollutant Discharge Elimination System (NPDES) facilities within EPA Region 10 (Alaska, Idaho, Oregon, Washington). 

• Memorandum: NPDES Major/Minor Designation Procedure for Region 10 (pdf) (152.1 KB, February 1, 2018)
  Memo to State NPDES Program Managers.
• NPDES Permit Major/Minor Designation Request Form and Permit Rating Worksheet for Region 10 (pdf) (1.49 MB, February 2018)