Arlington Treatment, Arlington

Overview

Arlington Treatment serves approximately 17,930 residents in Arlington, Washington. The plant operates under U.S. EPA and Washington state regulations, discharging treated wastewater into the Stillaguamish River watershed.

Arlington Treatment is a municipal wastewater facility located in Arlington, Snohomish County, Washington, serving a population of about 17,930. The plant is situated near the Stillaguamish River, which flows into Puget Sound, and plays a key role in protecting local water quality. As a medium-sized agglomeration, the plant is subject to the U.S. Clean Water Act and Washington Department of Ecology permits, which typically require secondary treatment for discharges to surface waters. The designed capacity is 1.00 million gallons per day, indicating a facility sized for the community's needs. The plant's treated effluent is discharged into the Stillaguamish River, a vital salmon and steelhead habitat that drains into Port Susan and Puget Sound. Protecting this watershed is critical for regional aquatic ecosystems and the broader Salish Sea environment.

Environmental context

The Stillaguamish River supports diverse aquatic life, including Chinook salmon and bull trout, and flows into Port Susan, a biologically rich estuary in Puget Sound. The plant's discharge must meet stringent water quality standards to protect these habitats and the downstream marine environment.

Frequently asked questions

Arlington Treatment is located at 146 West Haller Avenue in Arlington, Snohomish County, Washington, USA.

The plant serves approximately 17,930 residents in the Arlington area.

The plant discharges treated effluent into the Stillaguamish River, which flows into Port Susan and Puget Sound.

The plant operates under the U.S. Clean Water Act and is permitted by the Washington Department of Ecology, which sets discharge limits to protect water quality.

Plants of this scale typically use secondary treatment (biological processes) to meet EPA standards, with possible nutrient removal if discharging to sensitive waters.