The East Bay Dischargers Authority (EBDA) was formed on February 15, 1974, by a “Joint Exercise of Powers Agreement” entered into by the City of Hayward, City of San Leandro, Oro Loma Sanitary District, Union Sanitary District, and Castro Valley Sanitary District. EBDA’s original mission was to provide for the “more efficient disposal of wastewater produced in each Member Agency, all to the economic and financial advantage of each Agency and otherwise for the benefit of each Agency.”

Prior to EBDA’s formation, each agency independently discharged wastewater to the shallow areas of San Francisco Bay. EBDA created the “Super Sewer”, an integrated transmission system that delivers treated wastewater to the deepest part of the Bay through a seven-mile outfall.