NPDES Permit for Wesco Operating, Inc. – Sheldon Dome Field in Wyoming

Under National Pollutant Discharge Elimination System permit number WY-0025607, Wesco Operating, Inc. is authorized to discharge from its Sheldon Dome Field wastewater treatment facility located on the Wind River Indian Reservation in Fremont County, Wyoming to an unnamed ephemeral tributary of Dry (Pasup) Creek, which is tributary to the Wind River.

The EPA is accepting public comment on the reissuance of this permit through October 30, 2026.

Current Permit

• WY-0025607 Wesco Operating, Inc. – Sheldon Dome Field Permit (pdf) (12.3 MB, March 12, 2015)
• WY-0025607 Wesco Operating, Inc. – Sheldon Dome Field Response to Comments (pdf) (108.1 KB, March 9, 2015)
• WY-0025607 Wesco Operating, Inc. – Sheldon Dome Field Statement of Basis (pdf) (1.8 MB, February 24, 2015)

Draft Permit

• WY-0025607 Wesco Operating - Sheldon Dome Field Draft NPDES Permit (pdf) (640.58 KB, September 28, 2026)
  The draft NPDES discharge permit.
• WY-0025607 Wesco Operating - Sheldon Dome Field Draft Statement of Basis (pdf) (1.19 MB, September 28, 2026)
  The statement of basis for the draft NPDES discharge permit.