City and County of Honolulu

Phase 1 of the Sand Island Wastewater Treatment Plant secondary treatment installation is underway, a $417 million project treating 20 million gallons per day, with completion on track for 2026.

Synagro Technologies was awarded a contract by the City and County of Honolulu for a design-build-operate anaerobic digestion capacity expansion at the Sand Island Wastewater Treatment Plant in Honolulu, Hawaii, including two 2.35 million-gallon digesters.