ATHENA STP Wastewater Treatment Plant, Athena, Oregon

ATHENA STP is a municipal wastewater treatment plant located in Athena, Oregon, serving a population of approximately 1,265 residents. The facility is situated in Umatilla County in the northeastern part of the state, an area characterized by agricultural land and the foothills of the Blue Mountains. As a small-scale treatment plant in the United States, ATHENA STP is subject to the Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting, administered by the Oregon Department of Environmental Quality. For communities of this size, secondary treatment is typically required to meet effluent quality standards before discharge. The plant's treated effluent is discharged into local waterways that ultimately drain to the Umatilla River, a tributary of the Columbia River. The Columbia River system supports diverse aquatic life, including salmon and steelhead runs, and is a major ecological and economic resource for the Pacific Northwest.

ATHENA STP discharges into the Umatilla River watershed, which flows into the Columbia River and eventually reaches the Pacific Ocean. The Umatilla River supports native fish species such as Chinook salmon and steelhead trout, which are ecologically and culturally significant. The region's semi-arid climate means that maintaining water quality in these rivers is critical for both aquatic habitats and downstream agricultural uses.