Papaikou Paukaa Wastewater Treatment Facility (WWTF), Hilo, Hawaii

Papaikou Paukaa Wastewater Treatment Facility (WWTF) is located in Hilo, on the Big Island of Hawaii, United States. This municipal plant serves a population of 1,326 residents in the Papaikou and Paukaa communities along the Hamakua Coast. The facility is part of Hawaii County's wastewater infrastructure, managed to protect the island's sensitive coastal and marine environments. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal wastewater before discharge. With a designed capacity of 1,324.89 million gallons per year and an actual discharge volume of 340.69 million gallons per year, the plant operates well below its capacity. As a small-scale facility, it meets the regulatory expectations for its size under the National Pollutant Discharge Elimination System (NPDES) permit program. The treated effluent is discharged into the Pacific Ocean via nearshore waters, contributing to the health of Hawaii's coastal ecosystems. The plant plays a crucial role in preventing untreated wastewater from entering the ocean, thereby protecting coral reefs, marine life, and recreational waters that are vital to the region's tourism and local communities.

The plant discharges into the Pacific Ocean along the Hamakua Coast of Hawaii Island. This coastal area supports diverse marine ecosystems, including coral reefs and nearshore fisheries. The treated effluent must meet stringent water quality standards to minimize impacts on sensitive marine habitats and ensure the safety of recreational waters. The plant's location in a volcanic island setting means groundwater and coastal waters are particularly vulnerable to contamination, making effective wastewater treatment essential for environmental protection.