Overview
West Longview WWTP serves approximately 16,629 people in Longview, Washington. The plant discharges treated wastewater into the Columbia River basin, supporting downstream water quality in the Pacific Northwest.
West Longview WWTP is a municipal wastewater treatment facility located in Longview, Cowlitz County, Washington, United States. The plant serves a population of about 16,629 residents, making it a medium-sized agglomeration under U.S. regulatory frameworks. As a U.S. facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Washington State Department of Ecology. For plants of this scale, secondary treatment is typically required, with additional nutrient controls in sensitive watersheds. The plant's treated effluent discharges into the Columbia River basin, which flows into the Pacific Ocean. This waterway supports diverse aquatic life, including salmon runs, and is an important ecological and economic resource for the region.
Environmental context
The plant discharges into the Columbia River basin, which drains into the Pacific Ocean. The lower Columbia River supports critical habitats for salmon, steelhead, and other native fish species. Effluent management is important to maintain water quality in this ecologically sensitive river system.
Frequently asked questions
West Longview WWTP is located in Longview, Cowlitz County, Washington, United States, along Sewage Lagoon Street.
The plant serves approximately 16,629 residents in the Longview area.
The plant discharges treated effluent into the Columbia River basin, which ultimately flows into the Pacific Ocean.
As a U.S. facility, West Longview WWTP operates under the Clean Water Act and is regulated via an NPDES permit issued by the Washington State Department of Ecology.
Plants of this scale in the U.S. typically provide secondary treatment, and may include additional nutrient removal if located in sensitive watersheds.
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