WILLIAMS STL Wastewater Treatment Plant, Hamilton County, Iowa

WILLIAMS STL is a municipal wastewater treatment plant located in Williams Township, Hamilton County, Iowa, United States. The facility serves a small population of 344 residents, reflecting its role in a rural community. It operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal 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 416.39 cubic meters per day and a current discharge volume of 189.27 cubic meters per day, the facility operates well within its 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, ensuring compliance with effluent limits. The treated effluent is discharged into local streams that drain into the Iowa River basin, eventually reaching the Mississippi River. This watershed supports diverse aquatic life and provides water for agriculture and recreation downstream. The plant's effective treatment helps maintain the ecological health of these water bodies.

The plant discharges into small streams in the Iowa River basin, which flows into the Mississippi River. This watershed supports a variety of fish and wildlife, including species important for recreational fishing. The secondary treatment process reduces nutrient and organic pollutant loads, helping to prevent eutrophication in downstream waters.