Eagle Butte STP Wastewater Treatment Plant, South Dakota | Regulatory Context

Eagle Butte STP is a wastewater treatment facility located in Eagle Butte, South Dakota, serving a population of about 2,820. The plant is situated in Dewey County and operates as part of the city's municipal wastewater system. As a small-scale facility, it plays a key role in managing local wastewater for the community. Under the U.S. Clean Water Act, wastewater treatment plants of this size are typically required to meet secondary treatment standards through the National Pollutant Discharge Elimination System (NPDES) permit program. The plant's designed capacity is 1.00 million gallons per day, indicating it is sized to handle the community's wastewater flows. Treatment processes are expected to comply with state and federal effluent guidelines. The plant discharges treated wastewater into the local watershed, which ultimately drains into the Missouri River basin. The Missouri River is a major waterway that supports diverse aquatic life and provides water for downstream communities. Proper treatment at Eagle Butte STP helps protect water quality in this important regional drainage system.

Eagle Butte STP discharges into the Missouri River basin, a major watershed that flows into the Mississippi River and eventually the Gulf of Mexico. The receiving waters support a variety of fish and wildlife, including migratory birds and aquatic species. The facility's location in the Great Plains region means the local watershed is sensitive to nutrient loading and sediment runoff, making effective wastewater treatment essential for maintaining downstream ecosystem health.