McKinleyville WWTF - Municipal Wastewater Treatment in Humboldt County, California

McKinleyville WWTF is a municipal wastewater treatment facility located in McKinleyville, Humboldt County, California, serving a population of approximately 12,900. Situated near the Pacific coast, the plant plays a key role in managing wastewater for this coastal community in Northern California. The plant operates under the US Clean Water Act, which requires secondary treatment for municipal wastewater discharges. The facility's designed capacity is 1.00 million gallons per day, and it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the California State Water Resources Control Board, ensuring compliance with water quality standards. The plant's treated effluent is discharged into the Pacific Ocean via the Mad River estuary. This coastal discharge is regulated to protect marine ecosystems, including nearshore habitats and species such as salmon and steelhead trout that rely on the Mad River watershed. The facility's location within 50 km of the coast underscores the importance of effective treatment to minimize environmental impact.

McKinleyville WWTF discharges into the Pacific Ocean via the Mad River estuary, a dynamic coastal environment that supports diverse aquatic life, including salmonids and migratory birds. The Mad River watershed drains the coastal mountains of Humboldt County, and the estuary serves as a critical nursery habitat. The plant's discharge must meet strict water quality standards to protect these sensitive ecosystems from nutrient loading and contaminants.