KENAI STP - Kenai, Alaska Wastewater Treatment Plant

KENAI STP is a municipal wastewater treatment plant serving the city of Kenai, located on the Kenai Peninsula in south-central Alaska. The facility serves a population of approximately 3,414 people, placing it in the small agglomeration category. The plant is situated near the coast, within 50 km of the Cook Inlet, and operates under the regulatory framework of the US Clean Water Act. As a small-scale facility in the United States, KENAI STP is subject to National Pollutant Discharge Elimination System (NPDES) permitting requirements administered by the Alaska Department of Environmental Conservation. US plants of this size typically employ secondary treatment or equivalent technologies to meet water quality standards. The plant's designed capacity is 1.00 million gallons per day, indicating a modest infrastructure suited to the local population. The treated effluent from KENAI STP is discharged into the Kenai River watershed, which flows into the Cook Inlet, an arm of the Pacific Ocean. The Kenai River is a critical habitat for salmon species, including king, sockeye, and silver salmon, and supports a robust recreational and commercial fishery. The plant's operations are important for protecting water quality in this ecologically sensitive river system and the downstream marine environment.

KENAI STP discharges into the Kenai River watershed, which drains into the Cook Inlet and ultimately the Gulf of Alaska. The Kenai River is a major salmon spawning and rearing habitat, supporting diverse aquatic life and a vital commercial fishery. The plant's location within 50 km of the coast means its effluent can influence nearshore marine water quality, making effective treatment essential for maintaining the ecological health of the inlet.