GRANGER POTW - Parker, Washington Wastewater Treatment Plant

GRANGER POTW is a publicly owned treatment works located in Parker, Washington, serving a population of approximately 3,270. The plant provides secondary treatment, a standard level for communities of this size under the U.S. Clean Water Act. It is situated in Yakima County, an agricultural region in central Washington. The plant has a designed capacity of 1,741.28 million gallons per day and currently discharges an average of 768.44 million gallons per day. As a secondary treatment facility, it meets the minimum requirements for municipal wastewater treatment in the United States, removing biodegradable organic matter and suspended solids. The plant operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect receiving waters. The treated effluent from GRANGER POTW flows into the Yakima River, a major tributary of the Columbia River. The Yakima River supports diverse aquatic life, including salmon and steelhead, and is an important resource for irrigation and recreation. The plant's discharge contributes to the overall water quality management in the Yakima Basin, which ultimately drains to the Pacific Ocean via the Columbia River.

GRANGER POTW discharges into the Yakima River, which flows into the Columbia River and then to the Pacific Ocean. The Yakima River basin supports critical salmonid habitats and is heavily used for agriculture. The plant's secondary treatment helps reduce nutrient and organic loads, protecting downstream water quality in this ecologically sensitive watershed.