2 plants indexed.
ANDOVER STP is a secondary treatment plant serving 190 people in Andover Township, Day County, South Dakota. It discharges 37.85 units of treated wastewater daily, with a designed capacity of 75.71 units.
WAUBAY STP is a secondary treatment plant serving 576 people in Day County, South Dakota. It discharges 151.42 megaliters of treated wastewater annually, operating under US EPA NPDES regulations.