HONOLULU (KHON2) – The city’s largest wastewater system upgrade is complete, and allows sewage in Windward Oahu to flow by gravity instead of energy.

“This is an engineering miracle, a real feat, a first of it’s kind in the history of the state of Hawaii,” said Honolulu Mayor Kirk Caldwell. “The way it’s designed where you’re being efficient on energy use, because you’re not pumping under pressure anymore. You’re letting Mother Nature through gravity move sewage.”

The existing force main that is no longer active will be decommissioned.

The $375 million project also increases the system’s storage to accommodate increased flow during heavy rain events, which officials say will greatly reduce the likelihood of spills in Windward Oahu.

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