Overview
DAYTON STP serves Dayton, Washington, treating wastewater for approximately 3,068 residents. The plant operates under U.S. EPA and Washington state regulations, discharging into the local watershed.
DAYTON STP is a municipal wastewater treatment plant located in Dayton, Washington, serving a population of about 3,068. The facility is situated in Columbia County and is part of the region's infrastructure for managing domestic wastewater. As a small-scale plant in the United States, DAYTON STP is subject to the Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting, administered by the Washington State Department of Ecology. The plant discharges treated effluent into the local watershed, which ultimately drains into the Touchet River, a tributary of the Walla Walla River, and then into the Columbia River system. This river network supports diverse aquatic life and is important for regional water quality and ecological health.
Environmental context
The treated effluent from DAYTON STP enters the Touchet River watershed, which flows into the Walla Walla River and then the Columbia River, the largest river in the Pacific Northwest. The Columbia River system supports salmon runs and other native fish species, making water quality management critical for downstream ecosystems. The region's semi-arid climate means that maintaining streamflow and nutrient levels is important for aquatic habitat.
Frequently asked questions
DAYTON STP is located in Dayton, Washington, United States, at approximately 46.32 latitude and -117.981 longitude.
DAYTON STP serves a population of about 3,068 residents in Dayton and surrounding areas.
DAYTON STP discharges treated effluent into the local watershed, which flows into the Touchet River, a tributary of the Walla Walla River and ultimately the Columbia River.
As a U.S. plant, DAYTON STP operates under the Clean Water Act and is regulated by an NPDES permit issued by the Washington State Department of Ecology, which sets discharge limits for pollutants.
For small plants serving around 3,000 people, secondary treatment is typically required under the Clean Water Act, which involves biological processes to reduce organic matter and suspended solids.
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