INWOOD STL Wastewater Treatment Plant, Inwood, Iowa

INWOOD STL is a wastewater treatment facility located on North Main Street in Inwood, Lyon County, Iowa. The plant serves a population of approximately 855 residents, making it a small-scale municipal treatment facility in the rural Midwest. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal wastewater. Secondary treatment typically involves biological processes to remove organic matter and suspended solids. The plant's designed capacity is 299.05 volume units, and the current discharge volume matches this figure, indicating full utilization. The treated effluent is discharged into local waterways that eventually drain into the Missouri River basin. As part of the Mississippi River watershed, the plant's operations contribute to the overall water quality of downstream ecosystems, including the Missouri River and ultimately the Gulf of Mexico.

The plant discharges into local streams that are part of the Missouri River basin, which flows into the Mississippi River and then to the Gulf of Mexico. The surrounding area is primarily agricultural, so the plant helps protect local water quality from nutrient pollution that could contribute to hypoxia in the Gulf.