Caddo Valley WWTP - Secondary Treatment Plant in Caddo Valley, Arkansas

Caddo Valley WWTP is a municipal wastewater treatment facility located in Caddo Valley, Arkansas, United States. The plant serves a small population of 635 residents in this rural community within Clark County. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal wastewater facilities. With a designed capacity of 1,022,060 gallons per day and an average discharge volume of 249,840 gallons per day, the plant operates well below its capacity, indicating room for future growth. As a U.S. facility, it operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Arkansas Department of Energy and Environment, ensuring compliance with federal water quality standards. The treated effluent from Caddo Valley WWTP is discharged into a local waterway that ultimately drains into the Ouachita River basin. The Ouachita River flows south through Arkansas and Louisiana before joining the Red River and eventually reaching the Gulf of Mexico. The plant plays a key role in protecting local water quality and downstream ecosystems in the Ouachita River watershed.

Caddo Valley WWTP discharges into a tributary of the Ouachita River, which flows through the Ouachita Mountains ecoregion. The Ouachita River supports diverse aquatic life, including several species of freshwater mussels and fish. Downstream, the river joins the Red River and empties into the Gulf of Mexico, making the plant's nutrient and pollutant removal important for both local and coastal water quality.