Williamsville WWTP - Secondary Treatment Plant in Williamsville, Missouri

Williamsville WWTP is a municipal wastewater treatment facility located on Louis Street in Williamsville, Wayne County, Missouri. The plant serves a small population of 342 residents, reflecting the rural character of the area. The plant provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal facilities. With a designed capacity of 189.27 megaliters and an annual discharge volume of 113.56 megaliters, the plant operates well within its capacity. As a U.S. facility, it operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. The plant plays a key role in protecting downstream aquatic ecosystems by reducing organic pollutants and suspended solids before discharge.

The plant discharges into the headwaters of the St. Francis River watershed, which flows south through Missouri and Arkansas before joining the Mississippi River. This region supports diverse aquatic life, including fish and macroinvertebrates, and the plant's secondary treatment helps maintain water quality in this ecologically sensitive area.