OCHEYEDAN WWTP - Secondary Treatment Plant in Osceola County, Iowa

OCHEYEDAN WWTP is a municipal wastewater treatment facility located in Osceola County, Iowa, serving a small population of 539 residents. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for most municipal facilities to reduce organic pollutants and suspended solids before discharge. The plant has a designed capacity of 264.98 megaliters and currently discharges 151.42 megaliters annually. As a US facility, it operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits and monitoring requirements to protect water quality. Secondary treatment typically involves biological processes such as activated sludge or trickling filters. The treated effluent is discharged into local waterways within the Missouri River basin, which ultimately drains to the Mississippi River and the Gulf of Mexico. The plant's location in rural Iowa means its discharge supports local aquatic ecosystems and downstream water quality in the region.

The plant discharges into tributaries of the Little Sioux River, which flows into the Missouri River and eventually the Mississippi River and Gulf of Mexico. The receiving waters support diverse aquatic life and are part of an important agricultural watershed. Proper treatment helps protect downstream ecosystems from nutrient pollution and pathogens.