Overview
WAHIAWA WWTP serves approximately 20,207 people in Wahiawa, Hawaii. The plant operates under U.S. Clean Water Act regulations for municipal wastewater treatment.
WAHIAWA WWTP is a municipal wastewater treatment facility located at 89 California Avenue in Wahiawa, Hawaii, serving a population of about 20,207. The plant is situated in the central part of Oahu, within Honolulu County, and is part of the island's wastewater infrastructure managed by local authorities. As a facility serving a medium-sized agglomeration, the plant is subject to the U.S. Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting requirements. For plants of this scale, secondary treatment is typically required, with additional nutrient removal if discharging to sensitive waters. The plant's treatment processes and capacity are designed to meet state and federal standards for protecting public health and the environment. The treated effluent from WAHIAWA WWTP is discharged into the local watershed, which ultimately drains to the Pacific Ocean. The receiving waters support diverse aquatic life and are important for recreational and ecological purposes. The plant plays a key role in maintaining water quality in the region, particularly given Hawaii's sensitive island ecosystems and reliance on clean coastal waters.
Environmental context
WAHIAWA WWTP discharges into the central Oahu watershed, which drains via streams and groundwater to the Pacific Ocean. The surrounding area includes agricultural lands and urban development, with downstream waters supporting coral reefs and marine habitats. Protecting these ecosystems from nutrient pollution is critical for maintaining biodiversity and water quality in Hawaii's coastal environment.
Frequently asked questions
WAHIAWA WWTP is located at 89 California Avenue in Wahiawa, Hawaii, within Honolulu County on the island of Oahu.
The plant serves approximately 20,207 people in the Wahiawa area.
The treated effluent is discharged into the local watershed, which ultimately drains to the Pacific Ocean. The discharge is regulated under the U.S. Clean Water Act via an NPDES permit.
As a U.S. municipal wastewater plant, WAHIAWA WWTP operates under the Clean Water Act and is subject to NPDES permitting. For a plant serving about 20,000 people, secondary treatment is typically required, with possible additional nutrient controls to protect sensitive coastal waters.
Plants of this scale in the U.S. generally employ secondary treatment (biological treatment) as a minimum. Many also include disinfection and, if discharging to nutrient-sensitive waters, advanced treatment for nitrogen and phosphorus removal.
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