HAMBURG STL Wastewater Treatment Plant, Fremont County, Iowa

HAMBURG STL is a municipal wastewater treatment plant located in Fremont County, Iowa, serving a small population of approximately 1,200 residents. The plant operates under the regulatory framework of the United States Clean Water Act, which requires secondary treatment for municipal wastewater discharges to protect water quality. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 953.92 units and an actual discharge volume of 802.51 units, the plant operates below its capacity, indicating adequate headroom for current demand. As a facility in the U.S., it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Iowa Department of Natural Resources, which set effluent limits and monitoring requirements. The treated effluent from HAMBURG STL is discharged into local waterways that ultimately drain into the Missouri River watershed. The Missouri River flows into the Mississippi River, which empties into the Gulf of Mexico. This downstream connection highlights the plant's role in protecting water quality in a major river basin that supports diverse aquatic life and provides drinking water for millions.

The plant discharges into the Missouri River watershed, which flows into the Mississippi River and eventually the Gulf of Mexico. This region supports diverse aquatic species and is an important migratory corridor for birds. The secondary treatment process helps reduce nutrient loads that could contribute to hypoxia in the Gulf of Mexico.