Gilbertville WWTP - Secondary Treatment Plant in Gilbertville, Iowa

Gilbertville WWTP is a municipal wastewater treatment facility located in Gilbertville, Iowa, a small community in Black Hawk County. The plant serves a population of 748 residents, providing essential sanitation services for the area. The plant operates with secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal wastewater. Under the National Pollutant Discharge Elimination System (NPDES), plants of this scale must meet effluent limits to protect water quality. The designed capacity is 757.08 cubic meters per day, with a current discharge volume of 454.25 cubic meters per day, indicating operational capacity below design. The treated effluent is discharged into local streams that flow into the Cedar River, a major tributary of the Iowa River, which ultimately drains into the Mississippi River. The plant plays a key role in protecting downstream aquatic ecosystems and maintaining water quality in the region.

The plant discharges into local waterways that are part of the Cedar River watershed, which flows into the Iowa River and then the Mississippi River. This region supports diverse aquatic life, including fish species such as catfish and bass, and provides habitat for migratory birds. The secondary treatment process helps reduce organic pollutants and suspended solids, protecting downstream water quality.