Lisbon WWTP - Secondary Treatment Facility in Lisbon, Iowa

Lisbon WWTP is a municipal wastewater treatment plant located in Lisbon, Iowa, serving a population of approximately 1,669 residents. The facility provides secondary treatment, a standard level for communities of this size in the United States, ensuring effective removal of organic matter and suspended solids. The plant has a designed capacity of 1,514.16 cubic meters per day and currently handles a daily discharge volume of about 794.94 cubic meters. 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, which set effluent limits to protect water quality. The treated effluent is discharged into a local water body that ultimately drains into the Mississippi River basin. This watershed supports diverse aquatic life and provides drinking water for downstream communities. The plant's secondary treatment helps reduce nutrient loading and protects the ecological health of the receiving waters.

The plant discharges into a tributary of the Cedar River, which flows into the Iowa River and then the Mississippi River. This watershed supports diverse aquatic species and is an important migratory corridor for birds. The Mississippi River basin is ecologically sensitive, with concerns about nutrient pollution contributing to the Gulf of Mexico hypoxic zone.