Wishram Sewer System - Small Rural Wastewater Plant in Wishram Heights, Washington

The Wishram Sewer System is a municipal wastewater treatment facility located in Wishram Heights, Klickitat County, Washington, United States. It serves a small population of 184 residents, reflecting its role in a rural community along the Columbia River corridor. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 378.54 megaliters and an annual discharge volume of 113.56 megaliters, the facility operates well below its capacity. Under the U.S. Clean Water Act, such plants are regulated through National Pollutant Discharge Elimination System (NPDES) permits issued by the Washington State Department of Ecology, ensuring compliance with water quality standards. The treated effluent is discharged into the Columbia River basin, which flows into the Pacific Ocean. The Columbia River supports diverse aquatic life, including salmon runs and other native species, making the plant's discharge management important for downstream ecosystems. The facility's inland location and small scale reduce its environmental footprint compared to larger coastal plants.

The plant discharges into the Columbia River watershed, which drains into the Pacific Ocean. The Columbia River is a major ecological corridor supporting salmon, steelhead, and other migratory fish. The surrounding area is semi-arid with agricultural and natural landscapes, and the river's water quality is critical for both aquatic life and human uses downstream.