Glendale STP - Secondary Wastewater Treatment Plant in Glendale, Oregon

Glendale STP is a municipal wastewater treatment facility located in Glendale, Douglas County, Oregon. The plant serves a small community of around 1,100 people, reflecting its role in managing residential wastewater for this rural town in the Pacific Northwest. The plant provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal wastewater facilities. With a designed capacity of 946.35 cubic meters per day and an average discharge volume of 185.49 cubic meters per day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local streams that drain into the Umpqua River, a major waterway in southwestern Oregon. The Umpqua River flows into the Pacific Ocean, supporting diverse aquatic ecosystems including salmon and steelhead trout. The plant's secondary treatment helps protect these downstream habitats from nutrient pollution and pathogens.

The plant discharges into tributaries of the Umpqua River, which flows approximately 111 miles to the Pacific Ocean at Winchester Bay. The Umpqua River basin supports critical habitat for anadromous fish species such as Chinook salmon and coho salmon, as well as steelhead trout. Secondary treatment reduces biochemical oxygen demand and suspended solids, mitigating impacts on these sensitive aquatic ecosystems.