Underwood Stab Pond Wastewater Treatment Plant, Underwood, Iowa

Underwood Stab Pond is a municipal wastewater treatment facility located in Underwood, Pottawattamie County, Iowa, United States. The plant serves a population of approximately 917 residents, reflecting its role as a small-scale treatment system for the local community. The plant provides secondary treatment, which is the standard biological treatment process required under the U.S. Clean Water Act for municipal wastewater. Secondary treatment typically involves biological oxidation and settling to remove organic matter and suspended solids. The facility's designed capacity is 620.81 units, and it discharges an average volume of 897.14 units, indicating operational conditions within its design parameters. The treated effluent from Underwood Stab Pond is discharged into local waterways that drain into the Missouri River basin. The Missouri River flows southward to join the Mississippi River, ultimately reaching the Gulf of Mexico. This downstream connection underscores the plant's role in protecting water quality in the broader Mississippi River watershed, which supports diverse aquatic life and provides drinking water for millions.

The plant discharges into receiving waters that are part of the Missouri River watershed, which flows into the Mississippi River and eventually the Gulf of Mexico. This region supports important aquatic habitats and migratory bird routes. The secondary treatment process helps reduce nutrient and organic loads, protecting downstream water quality in this agriculturally intensive area.