Keiser WWTP - Secondary Wastewater Treatment in Mississippi County, Arkansas

Keiser WWTP is a municipal wastewater treatment facility located in Mississippi County, Arkansas, serving a small community of 759 residents. The plant provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for most municipal facilities to reduce organic pollutants and suspended solids before discharge. The plant's designed capacity is 567.81 million gallons per year, and it treats an average discharge volume of 590.52 million gallons annually. As a small-scale facility, it operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality in the receiving water body. The treated effluent is discharged into a local waterway that ultimately drains into the Mississippi River basin. The plant plays a key role in protecting downstream aquatic ecosystems by reducing nutrient and pathogen loads, supporting water quality in the region's agricultural and wetland environments.

The plant discharges into a tributary of the Mississippi River, which flows into the Gulf of Mexico. The Mississippi River basin is a major ecological corridor supporting diverse fish and bird species. Nutrient loading from wastewater can contribute to hypoxia in the Gulf, making effective treatment critical for downstream water quality.