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NPDES Permit for Chippewa Cree N.O. Winz RO Treatment Plant in Montana

Under draft National Pollutant Discharge Elimination System permit number MT-0000007, the Chippewa Cree Tribal Water Resources Department will be authorized to discharge from from its N.O. Winz Reverse Osmosis Treatment Plant located on the Rocky Boys Indian Reservation in Hill County, Montana to a tributary of Big Sandy Creek.

The EPA is currently accepting public comment on the draft permit through November 16, 2026.

Draft Permit

MT-0000007 Chippewa Cree N.O. Winz Reverse Osmosis Treatment Plant draft Permit (pdf) (457.6 KB, October 8, 2026)
The draft NPDES discharge permit.
MT-0000007 Chippewa Cree N.O. Winz Reverse Osmosis Treatment Plant draft Statement of Basis (pdf) (509.38 KB, October 8, 2026)
The statement of basis for the draft NPDES discharge permit.