DUNCOMBE STL Wastewater Treatment Plant, Duncombe, Iowa

DUNCOMBE STL is a municipal wastewater treatment plant located in Duncombe, Webster County, Iowa. It serves a small community of approximately 488 residents, reflecting the rural character of the area. The plant is situated in the Midwestern United States, a region characterized by agricultural land use and a network of rivers and streams. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for municipal wastewater facilities. Secondary treatment typically involves biological processes to remove organic matter and suspended solids. The plant has a designed capacity of 151.42 megaliters per year and discharges a similar volume, indicating it operates near its design capacity. As a US facility, it is subject to National Pollutant Discharge Elimination System (NPDES) permitting, which sets effluent limits to protect water quality. The treated effluent from DUNCOMBE STL is discharged into a local water body, likely a stream or river within the Mississippi River basin. The plant's operations help protect downstream aquatic ecosystems and maintain water quality for recreational and ecological uses. Its location inland and away from coastal areas reduces direct marine impact, but its discharge contributes to the overall health of the regional watershed.

The plant discharges into a local water body that is part of the Mississippi River basin, ultimately draining into the Gulf of Mexico. The receiving waters support diverse aquatic life and are used for recreation and agriculture. The plant's secondary treatment helps reduce nutrient loads, which is important for mitigating hypoxia in the Gulf of Mexico.