Overview
Prosser WWTP serves approximately 5,780 people in Benton County, Washington. The plant discharges treated wastewater into the regional watershed, supporting local water quality and downstream ecosystems.
Prosser WWTP is a municipal wastewater treatment facility located in Benton County, Washington, serving a population of about 5,780 residents. The plant is situated in the arid Columbia Plateau region, where water resources are critical for agriculture and habitat. As a facility serving fewer than 10,000 people, Prosser WWTP operates under the U.S. Clean Water Act, which requires secondary treatment as a baseline for municipal wastewater plants. The plant's treatment processes are designed to meet state and federal effluent standards, protecting the receiving waters from nutrient pollution and pathogens. The treated effluent from Prosser WWTP ultimately drains into the Yakima River basin, a tributary of the Columbia River. The Columbia River system supports salmon runs, irrigation, and hydroelectric power, making the plant's discharge management important for regional ecological health.
Environmental context
Prosser WWTP discharges into the Yakima River watershed, which flows into the Columbia River and eventually the Pacific Ocean. The Yakima River supports diverse aquatic life, including several salmonid species, and is a vital water source for agriculture in central Washington. The plant's operations help maintain water quality in this semi-arid region, where low flows can concentrate pollutants.
Frequently asked questions
Prosser WWTP is located on Grande Road in Benton County, Washington, United States, near the city of Prosser.
Prosser WWTP serves approximately 5,780 people in the Benton County area.
Prosser WWTP discharges treated effluent into the Yakima River watershed, which flows into the Columbia River and eventually the Pacific Ocean.
Prosser WWTP operates under the U.S. Clean Water Act, with National Pollutant Discharge Elimination System (NPDES) permits issued by the Washington State Department of Ecology.
In the U.S., municipal wastewater plants serving populations under 10,000 typically provide secondary treatment, which includes biological processes to remove organic matter and suspended solids, meeting EPA secondary treatment standards.
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