ANDOVER STP - Secondary Wastewater Treatment in Day County, South Dakota

ANDOVER STP is a municipal wastewater treatment facility located on Cemetery Road in Andover Township, Day County, South Dakota. It serves a small population of 190 residents, reflecting the rural character of the area. The plant is situated in the northern Great Plains region, where cold winters and low population density shape infrastructure needs. The facility provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal plants discharging to surface waters. Secondary treatment typically involves biological processes to remove organic matter and suspended solids. The plant's designed capacity is 75.71 units, with an actual discharge volume of 37.85 units, indicating it operates well below capacity. The treated effluent from ANDOVER STP is discharged into local waterways that ultimately drain into the James River basin, part of the larger Missouri River watershed. This region supports agricultural land and prairie ecosystems. Proper treatment helps protect downstream water quality and aquatic habitats in this sparsely populated area.

ANDOVER STP discharges into local streams that flow into the James River, a tributary of the Missouri River. The Missouri River eventually reaches the Mississippi River and the Gulf of Mexico. The surrounding watershed is primarily agricultural, with runoff from farms and livestock operations posing potential nutrient and sediment challenges. The plant's secondary treatment helps reduce organic pollutants and suspended solids, supporting the ecological health of these prairie waterways.