GREENE WWTP - Secondary Treatment Plant in Butler County, Iowa

GREENE WWTP is a municipal wastewater treatment facility located in Butler County, Iowa, United States. The plant serves a population of approximately 1,142 residents, making it a small-scale facility within the state's wastewater infrastructure. It is situated on Sandhill Road, and its operations are part of the broader network serving rural communities in north-central Iowa. The plant provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal wastewater. With a designed capacity of 643.52 thousand cubic meters and an actual discharge volume of 529.96 thousand cubic meters, the facility operates below its maximum capacity. As a U.S. plant, it 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 local waterways that ultimately drain into the Mississippi River basin. This region is part of the Upper Mississippi River watershed, which supports diverse aquatic life and provides drinking water for downstream communities. The plant's secondary treatment helps reduce organic pollutants and suspended solids, contributing to the ecological health of the receiving waters.

The plant discharges into local streams that flow into the Cedar River, a tributary of the Iowa River, which eventually joins the Mississippi River. This watershed supports a variety of fish species and provides habitat for migratory birds. The region's agricultural landscape means that nutrient management is a key concern, and the plant's secondary treatment helps mitigate nutrient loading into downstream waters.