Hornick Sewage Lagoon: Wastewater Treatment in Woodbury County, Iowa

Hornick Sewage Lagoon is a municipal wastewater treatment facility located in Woodbury County, Iowa, serving a small population of 222 residents. The plant operates under the regulatory framework of the United States Clean Water Act, which requires secondary treatment for all publicly owned treatment works. As a small agglomeration, the plant is subject to EPA National Pollutant Discharge Elimination System (NPDES) permitting, ensuring compliance with water quality standards. The plant provides secondary treatment, a biological process that removes organic matter and suspended solids. With a designed capacity of 113.56 million gallons per year and a discharge volume matching that figure, the facility operates at full capacity. The treatment process involves lagoon-based systems typical of small rural communities in the Midwest. The treated effluent is discharged into local streams that drain into the Missouri River watershed, ultimately reaching the Mississippi River and the Gulf of Mexico. The plant plays a key role in protecting downstream water quality in the Missouri River basin, which supports diverse aquatic life and agricultural uses.

The plant discharges into tributaries of the Missouri River, which flows into the Mississippi River and eventually the Gulf of Mexico. The Missouri River basin is ecologically significant, supporting a variety of fish species and providing habitat for migratory birds. The plant's secondary treatment helps reduce nutrient loading that could contribute to hypoxia in the Gulf of Mexico.