Washougal S_T Facility: Municipal Wastewater Treatment in Washougal, Washington

The Washougal S_T Facility is a municipal wastewater treatment plant located in Washougal, Clark County, Washington, along Southeast Lewis and Clark Highway. It serves an estimated population of 14,210, classifying it as a medium-sized agglomeration under US regulatory standards. The plant is situated inland, approximately 50 kilometers from the Pacific coast, and discharges into the Columbia River watershed. As a US 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 a plant serving this population, secondary treatment is typically required, with potential additional nutrient controls if discharging to sensitive waters. Regulatory compliance ensures effluent quality standards are met. The treated effluent from the Washougal S_T Facility ultimately flows into the Columbia River, which drains into the Pacific Ocean. The Columbia River is a major ecological corridor supporting diverse aquatic life, including salmon runs. The plant's discharge contributes to the river's water quality, and its operation is critical for protecting downstream habitats and recreational uses.

The Washougal S_T Facility discharges into the Columbia River, which flows westward to the Pacific Ocean. The Columbia River basin supports a rich ecosystem, including migratory fish species such as salmon and steelhead. The plant's location near the river requires careful management of nutrients and pollutants to prevent eutrophication and protect aquatic habitats. The downstream environment includes the Columbia River estuary, a critical nursery for marine life.