Kahuku WWTP - Secondary Wastewater Treatment in Kahuku, Hawaii

Kahuku WWTP is a municipal wastewater treatment facility located in Kahuku, on the island of Oahu, Hawaii. The plant serves a small population of approximately 1,500 residents, providing secondary treatment to meet state and federal water quality standards. The plant operates under the U.S. Clean Water Act, which requires secondary treatment for municipal wastewater discharges. With a designed capacity of 757.08 m³/day and an average daily flow of 454.25 m³/day, the facility has reserve capacity to accommodate future growth. Treatment processes typical for secondary plants include biological treatment followed by disinfection. The treated effluent is discharged into the local watershed, which ultimately drains to the Pacific Ocean. As an inland plant on Oahu, the facility plays a key role in protecting coastal water quality and marine ecosystems, including nearby coral reefs and nearshore habitats that support diverse aquatic life.

Kahuku WWTP discharges treated wastewater into the local watershed on Oahu's North Shore, which flows into the Pacific Ocean. The receiving waters support sensitive marine ecosystems, including coral reefs and nearshore habitats that are vital for fish, sea turtles, and other marine species. The plant's secondary treatment helps reduce nutrient and pathogen loads, protecting water quality in this ecologically important coastal area.