A project to pump treated sewage away from Nassau County’s Western Bays will be completed in less than a year, environmentalists say.

The plan is more than two decades in the making. It will use an abandoned aqueduct to pump wastewater from the Bay Park Sewage Treatment Plant and the Long Beach Sewage Treatment Plant to an ocean outfall pipe.

The project is costing more than $500 million in state and federal funds.

The Bay Park Sewage Treatment Plant currently releases 53 million gallons of waste into the bay each day.