Blairsburg STL Wastewater Treatment Plant, Hamilton County, Iowa

Blairsburg STL is a municipal wastewater treatment plant located in Hamilton County, Iowa, United States. The facility serves a small population of 269 residents and operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal plants discharging to surface waters. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 189.27 megaliters per year and an actual discharge volume of 113.56 megaliters per year, the facility operates well within its capacity, indicating effective management for its small service area. The treated effluent is discharged into local waterways that drain into the Iowa River basin, ultimately flowing to the Mississippi River. This contributes to the overall water quality of the region, supporting aquatic life and downstream ecosystems in the Mississippi River watershed.

The plant's discharge enters the Iowa River basin, which flows into the Mississippi River. The Mississippi River is a major ecological corridor supporting diverse fish and migratory bird species. The plant's secondary treatment helps protect downstream water quality in this agriculturally intensive region.