Coal Hill WWTP - Johnson County, Arkansas Wastewater Treatment Plant

Coal Hill WWTP is a municipal wastewater treatment facility located in Johnson County, Arkansas, serving a population of approximately 1,012 residents. The plant operates under the regulatory framework of the United States Clean Water Act, which requires secondary treatment for municipal wastewater discharges to protect water quality. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 567.81 million gallons per year and an actual discharge volume of 268.76 million gallons per year, the facility operates well below its capacity, indicating room for future growth. The treated effluent is discharged into local waterways that ultimately drain into the Arkansas River watershed. The plant plays a key role in protecting downstream aquatic ecosystems and maintaining water quality in the region's rivers and streams.

The plant discharges into local tributaries of the Arkansas River, which flows through Arkansas and eventually joins the Mississippi River. The downstream environment supports diverse aquatic life, including fish and macroinvertebrates, and the plant's secondary treatment helps reduce nutrient and pollutant loads to these water bodies.