Green City WWTP - Secondary Treatment Facility in Green City, Missouri

Green City WWTP is a municipal wastewater treatment plant located in Green City, Sullivan County, Missouri. It serves a small population of 657 residents, providing essential sanitation services for this rural community in the north-central part of the state. The plant operates with secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal facilities. With a designed capacity of 378.54 cubic meters per day and an average discharge volume of 227.13 cubic meters per day, the plant has adequate capacity to handle current flows. As a small facility, it is subject to EPA National Pollutant Discharge Elimination System (NPDES) permitting, typically administered by the Missouri Department of Natural Resources. The treated effluent is discharged into local streams that flow into the Grand River system, part of the larger Missouri River watershed. This ultimately drains into the Mississippi River and the Gulf of Mexico. The plant plays a key role in protecting downstream water quality and aquatic habitats in this agriculturally dominated landscape.

The plant discharges into tributaries of the Grand River, which flows into the Missouri River and eventually the Mississippi River and Gulf of Mexico. This watershed supports diverse aquatic life and is important for regional biodiversity. The surrounding area is primarily agricultural, so the plant helps reduce nutrient and pathogen loads that could otherwise impact downstream ecosystems.