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Hawaii Water Service is advancing a feasibility study for a decentralized wastewater treatment plant in Kapalua, aimed at supplying recycled water for irrigation to bolster local water security. The study, conducted by Carollo Engineering Inc., will evaluate the potential benefits of local wastewater treatment, including site identification and advanced treatment technologies.

Expected to complete in fall 2026, the assessment will also consider regulatory requirements, land needs, and operational costs. Hawaii Water Service operates another wastewater treatment facility in Pukalani, which processes about 200,000 gallons of wastewater daily.