North Bay WWTP, Belfair, Washington - Small Community Wastewater Treatment

North Bay WWTP is a municipal wastewater treatment facility located in Belfair, Washington, within Mason County. The plant serves a population of approximately 4,175 residents, classifying it as a small-scale treatment facility in the Pacific Northwest region of the United States. As a U.S. wastewater plant, North Bay WWTP operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Washington State Department of Ecology. The plant has a designed capacity of 1.00 million gallons per day, which is typical for a facility serving a small community. Plants of this scale commonly employ secondary treatment to meet federal and state standards. The plant's treated effluent is discharged into a local waterway that ultimately drains into Hood Canal, a fjord-like estuary of Puget Sound. This sensitive marine environment supports diverse aquatic life, including salmon and shellfish, and requires careful management of nutrient and pathogen loads to protect water quality and ecosystem health.

North Bay WWTP discharges into a tributary of Hood Canal, a long, narrow estuary connected to Puget Sound and the Salish Sea. Hood Canal is a critical habitat for Pacific salmon, steelhead, and geoduck clams, and is vulnerable to low dissolved oxygen events caused by nutrient pollution. The plant's location within 50 km of the coast underscores the importance of effective treatment to protect downstream marine ecosystems.