Overview
Salishan STP is a secondary wastewater treatment plant in Lincoln County, Oregon, serving approximately 1,100 people. It discharges treated effluent near the Siletz Bay area on the Pacific coast.
Salishan STP is a municipal wastewater treatment facility located in Lincoln County, Oregon, near Gleneden Beach. The plant serves a small coastal community of about 1,100 residents and operates under secondary treatment standards as required by the U.S. Clean Water Act. The plant has a designed capacity of 757.08 cubic meters per day and currently treats an average daily flow of 484.53 cubic meters. As a secondary treatment facility, it uses biological processes to remove organic matter and suspended solids, meeting federal and state discharge requirements for coastal communities. The treated effluent is discharged into the Siletz Bay estuary, which flows into the Pacific Ocean. This coastal environment supports diverse marine life, including salmon, shellfish, and migratory birds. The plant's proximity to the coast necessitates careful management to protect water quality in the bay and nearshore ocean waters.
Environmental context
The plant discharges into the Siletz Bay estuary, a tidally influenced water body that connects to the Pacific Ocean. This coastal watershed supports critical habitats for salmon, steelhead, and shellfish, and serves as an important stopover for migratory birds along the Pacific Flyway. The estuary's health depends on maintaining low nutrient and pollutant loads from upstream sources.
Frequently asked questions
Salishan STP is located near Gleneden Beach in Lincoln County, Oregon, adjacent to the Siletz Bay State Airport on Tom Robertson Boulevard.
The plant serves approximately 1,100 residents in the coastal community of Gleneden Beach and surrounding areas in Lincoln County.
The plant discharges treated effluent into the Siletz Bay estuary, which flows into the Pacific Ocean. The discharge is managed under a National Pollutant Discharge Elimination System (NPDES) permit.
Salishan STP provides secondary treatment, which uses biological processes to remove organic matter and suspended solids, meeting Clean Water Act standards for coastal discharges.
As a municipal wastewater plant in the U.S., Salishan STP operates under the Clean Water Act, which requires secondary treatment for discharges to surface waters. The plant's NPDES permit sets limits on pollutants to protect the Siletz Bay estuary and Pacific Ocean.
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