ETHAN Town of Wastewater Treatment Plant - Davison County, South Dakota

The ETHAN Town of wastewater treatment plant is located in Davison County, South Dakota, United States. It serves a small population of 312 residents, providing essential wastewater treatment for the local community. The plant operates under the regulatory framework of the U.S. Clean Water Act, which governs discharge permits and treatment standards for facilities of this scale. The plant provides secondary treatment, a standard level required for most municipal wastewater plants in the United States. Its designed capacity is 151.42 megaliters, with an annual discharge volume of 113.56 megaliters, indicating operational capacity is well within design limits. As a small facility, it is subject to state-level oversight under the National Pollutant Discharge Elimination System (NPDES) permitting program. The treated effluent is discharged into a local waterway, ultimately contributing to the Missouri River basin. This region is part of the larger Mississippi River watershed, which drains into the Gulf of Mexico. The plant's operations help protect downstream water quality and aquatic habitats in this agriculturally important area.

The plant discharges into a local stream that flows into the James River, a tributary of the Missouri River. The Missouri River basin supports diverse aquatic life and provides critical habitat for migratory birds. Downstream, the Missouri River joins the Mississippi River, which empties into the Gulf of Mexico, where nutrient pollution can contribute to hypoxic zones. The plant's secondary treatment helps reduce organic pollutants and nutrients, mitigating impacts on this extensive watershed.