Shelby WWTP - Secondary Wastewater Treatment in Shelby, Iowa

Shelby WWTP is a municipal wastewater treatment plant located in Shelby, Iowa, serving a small population of 696 residents. The facility provides secondary treatment, a standard level for communities of this size in the United States. The plant has a designed capacity of 378.54 cubic meters per day and a reported discharge volume of 264.98 cubic meters per day, indicating operational capacity below design levels. As a US facility, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Iowa Department of Natural Resources. The treated effluent is discharged to local surface waters, which ultimately drain into the Missouri River basin. This waterway supports diverse aquatic life and is an important ecological corridor in the region. The plant's secondary treatment helps protect downstream water quality.

The plant discharges into local streams that flow into the Missouri River, a major tributary of the Mississippi River. The Missouri River basin supports diverse aquatic ecosystems and is a critical migratory route for fish and birds. Secondary treatment reduces organic pollutants and suspended solids, helping maintain water quality in this agriculturally influenced watershed.