SPANGLE S_T FACILITY Wastewater Treatment Plant, Spangle, Washington

The SPANGLE S_T FACILITY is a municipal wastewater treatment plant located in Spangle, Washington, a small town in Spokane County. The plant serves a population of approximately 297 residents, reflecting its role in a rural community. As a secondary treatment facility, it provides biological treatment to remove organic matter and suspended solids from wastewater. The plant operates under the regulatory framework of the United States Clean Water Act, which requires secondary treatment for municipal wastewater discharges. The National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Washington State Department of Ecology, governs the plant's discharge limits and monitoring requirements. The plant's designed capacity of 151.42 million gallons per year indicates it is sized for modest flows, with current discharge volumes at about half that capacity. The treated effluent from the SPANGLE S_T FACILITY is discharged to a local water body, likely a tributary of the Spokane River or the Palouse River basin. The Spokane River flows westward into the Columbia River, which ultimately reaches the Pacific Ocean. The plant's inland location, more than 50 km from the coast, reduces direct marine impact, but its discharge contributes to the overall water quality of the regional watershed.

The plant discharges into a local water body within the Spokane River basin, which drains into the Columbia River and then the Pacific Ocean. The Spokane River supports diverse aquatic life, including salmonid species, and is ecologically sensitive to nutrient loading and pollutants. The plant's secondary treatment helps protect downstream water quality in this inland watershed.