You are here:  Main / Customer Services / Public Communications Division / Honolulu News Releases 2003 / Sewage Spill At Wahiawa


December 8, 2003




            An estimated 195,000 gallons of raw sewage spilled into Lake Wilson last night (December 7), after a plastic manhole insert broke loose and jammed equipment at the Wahiawa Wastewater Treatment Plant.

            The spill, detected at 8:30 p.m., resulted when the manhole insert became caught in a device that grinds large materials in the wastewater that flows into the treatment plant.  Incoming sewage flows were especially strong because of the heavy rains, and the blockage could not be cleared immediately. When the device stopped functioning, the sewage flow backed up, entering Lake Wilson.

            When the spill was stopped at 10:30 p.m., an influent pump at the treatment plant then failed, eventually causing about 10,000 gallons of sewage to be given partial treatment (a less-intensive process involving sand filtering and ultraviolet disinfection), before going into Lake Wilson.  The malfunctioning pump was repaired by 12:30 a.m. this morning (December 8) and normal treatment resumed at 4:35 a.m. 

             The City is analyzing water samples from Lake Wilson for pollution levels and warning signs have been posted at affected areas of the Lake.  The State Department of Health has been notified of the incident.





Monday, December 08, 2003

© Copyright 2002-2006 City and County of Honolulu, Hawaii
Privacy Statement | Technical Support | Customer Service | Policy | Accessibility | Diversity Statement