An estimated 3,470 gallons of raw sewage flowed into Pearl Harbor's West Loch on Sunday, the city said.

Tree roots clogging an 8-inch wastewater pipe caused a manhole on Hamana Street in the West Loch Fairways subdivision to overflow, sending untreated wastewater into a storm drain that empties into West Loch.

The city notified the state Department of Health. Signs have been posted and water sampling was conducted yesterday.