NPDES Permit for Grand River Casino and Resort Wastewater Treatment Facility in South Dakota
Under National Pollutant Discharge Elimination System permit number SD-0034752, the Standing Rock Sioux Tribe's Grand River Casino and Resort is authorized to discharge from its wastewater treatment facility located on the Standing Rock Reservation at 45.5614 °N, 100.5069 °W, in Corson County, South Dakota, to an unnamed dry tributary to Claymore Creek which discharges into an inlet of Lake Oahe (Missouri River).