Workers from the Department of Environmental Services responded early Sunday morning to a sanitary sewer overflow at the Kaneohe Pretreatment Facility.
The event is estimated to have occurred between 3-4:30 a.m.
Kawa Stream overflowed its banks and flooded between 3-5 feet of water at the Kawa Pump Station and road in back of the facility, co-mingling and overflowing manholes that eventually flowed to the Kawa and Kaneohe stream fence lines.
Crews are unable to estimate mixed flows into the streams at this time.
They will clean, disinfect and deodorize when the area dries out.
The Department of Health has been notified. Warning signs and water sampling is underway.