GILMAN CITY WWTP - Secondary Treatment Plant in Harrison County, Missouri

GILMAN CITY WWTP is a municipal wastewater treatment plant located in Sugar Creek Township, Harrison County, Missouri. The facility serves a small population of 383 residents and operates as part of the local wastewater infrastructure for the rural community. 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 321.76 million gallons per year and an actual discharge volume of 113.56 million gallons per year, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into a local waterway that ultimately drains into the Missouri River watershed, contributing to the Mississippi River basin. The plant's operations are subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Missouri Department of Natural Resources, ensuring compliance with water quality standards to protect downstream aquatic ecosystems.

The plant discharges into a tributary of the Grand River, which flows into the Missouri River and eventually the Mississippi River. The surrounding watershed supports agricultural land use and diverse aquatic life. The plant's secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream water quality in this predominantly rural region.