Granville WWTP - Secondary Wastewater Treatment in Sioux County, Iowa

Granville WWTP is a municipal wastewater treatment facility located in Sioux County, Iowa, United States. The plant serves a small population of 312 residents and operates under secondary treatment standards, which is typical for small communities in rural areas. The plant's designed capacity is 189.27 megaliters, with an annual discharge volume of 113.56 megaliters, indicating it operates below its full capacity. As a US facility, it is subject to the Clean Water Act and likely operates under an NPDES permit issued by the Iowa Department of Natural Resources, which sets effluent limits to protect water quality. The treated effluent is discharged into a local water body, contributing to the Missouri River watershed. The plant's location in northwest Iowa places it within an agricultural region, where wastewater treatment plays a key role in preventing nutrient pollution and protecting downstream aquatic ecosystems.

The plant discharges into a local water body that drains into the Missouri River, which flows south to the Mississippi River and ultimately into the Gulf of Mexico. This watershed is part of the larger Mississippi River Basin, which is ecologically significant for its diverse aquatic habitats and migratory bird routes. The plant's secondary treatment helps reduce organic pollutants and suspended solids, supporting water quality in this agriculturally intensive region.