Marshall WWTP, Harrison County, Texas | Wastewater Treatment Plant Overview

Marshall WWTP is a municipal wastewater treatment facility located in Harrison County, Texas, serving a population of around 26,350. The plant is situated inland, more than 50 kilometers from the coast, and discharges into local waterways within the Red River basin. As a US facility serving a medium-sized agglomeration, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Texas Commission on Environmental Quality. These permits set effluent limits based on the receiving water's quality standards and the treatment technology employed. The plant's treated effluent ultimately flows into the Red River system, which drains into the Mississippi River and then the Gulf of Mexico. This connection underscores the plant's role in protecting downstream aquatic ecosystems and maintaining water quality in a major river basin.

The Marshall WWTP discharges into tributaries of the Red River, which flows through Texas, Oklahoma, Arkansas, and Louisiana before joining the Mississippi River. The Red River basin supports diverse aquatic life and provides habitat for migratory fish species. The plant's operations help maintain water quality in this ecologically significant watershed, which ultimately drains into the Gulf of Mexico.