Overview
Honouliuli WWTP serves approximately 189,000 people in Kapolei, Hawaii, as a key municipal wastewater facility on Oahu. It operates under US EPA and Hawaii Department of Health regulations.
Honouliuli WWTP is a major wastewater treatment facility located in Kapolei, on the island of Oahu, Hawaii. Serving a population of around 189,000, it is a critical component of the region's wastewater infrastructure, handling municipal sewage from the growing Ewa Plain area. The plant is situated near Geiger Road in the Ewa Gentry community, within Honolulu County. As a large agglomeration serving over 150,000 people, Honouliuli WWTP is subject to stringent US EPA Clean Water Act requirements, including National Pollutant Discharge Elimination System (NPDES) permits. The Hawaii Department of Health oversees compliance with state water quality standards. The plant's treated effluent is discharged into the Pacific Ocean via a deep ocean outfall, supporting the health of nearshore marine ecosystems. Oahu's coastal waters are ecologically significant, hosting coral reefs and diverse marine life. Proper treatment is essential to prevent nutrient pollution and protect recreational and cultural uses of the ocean.
Environmental context
Honouliuli WWTP discharges treated wastewater into the Pacific Ocean off the south coast of Oahu, near the entrance to Pearl Harbor. The receiving waters are part of a dynamic coastal environment that supports coral reefs, fish populations, and migratory species. The outfall is designed to disperse effluent in deeper waters to minimize impact on nearshore habitats, which are ecologically sensitive and important for local fishing and tourism.
Frequently asked questions
Honouliuli WWTP is located in Kapolei, Hawaii, on the island of Oahu, near Geiger Road in the Ewa Gentry area.
The plant serves approximately 188,905 people, making it a large municipal wastewater facility for the Ewa Plain and surrounding communities.
Treated effluent is discharged into the Pacific Ocean via a deep ocean outfall, designed to minimize environmental impact on nearshore coral reefs and marine habitats.
As a US facility, Honouliuli WWTP operates under the Clean Water Act, with NPDES permits issued by the Hawaii Department of Health to ensure compliance with water quality standards.
Plants of this scale in the US typically require secondary treatment as a minimum, with many employing advanced treatment to meet strict nutrient limits, especially for coastal discharges.
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