WOOLSTOCK STL Wastewater Treatment Plant, Hamilton County, Iowa

WOOLSTOCK STL is a municipal wastewater treatment plant located in Hamilton County, Iowa, United States. It serves a small population of 212 residents in the rural community of Woolstock, operating under the regulatory framework of the US Clean Water Act. The plant provides secondary treatment, which is the standard level required for small communities under the National Pollutant Discharge Elimination System (NPDES) permit program. It has a designed capacity of 113.56 megaliters and an annual discharge volume of 75.71 megaliters, indicating moderate utilization. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. The plant plays a role in protecting downstream water quality in the Iowa River watershed, supporting aquatic life and recreational uses in the region.

The plant discharges into local streams that flow into the Iowa River, a tributary of the Mississippi River. The Mississippi River basin supports diverse aquatic ecosystems and provides drinking water for millions. The plant's secondary treatment helps reduce nutrient and organic pollutant loads, mitigating eutrophication risks in downstream water bodies.