ONAGA WWTP - Secondary Treatment Plant in Onaga, Kansas

ONAGA WWTP is a municipal wastewater treatment facility located in Onaga, Kansas, United States. The plant serves a small population of 673 residents in the Pottawatomie County area, providing essential sanitation services to the community. The plant operates with secondary treatment, which is the standard level required under the US Clean Water Act for facilities of this scale. It has a designed capacity of 548.88 volume units and a current discharge volume of 442.89 volume units, indicating it operates below its full capacity. As a US facility, it is subject to National Pollutant Discharge Elimination System (NPDES) permitting, which sets effluent limits to protect water quality. The treated effluent is discharged into local waterways that ultimately drain into the Kansas River basin and then the Missouri River system. The plant plays a key role in protecting downstream aquatic habitats and maintaining water quality in the region's freshwater ecosystems.

The plant discharges into local streams that flow into the Kansas River, a major tributary of the Missouri River. This watershed supports diverse aquatic life and provides habitat for fish and wildlife species. The plant's secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream water quality in the Missouri River basin.