State health officials say 103,400 gallons of sewage overflowed in Palolo Valley Monday night.
The public was advised to stay out of Palolo Stream, Ala Wai Canal, Magic Island and surf sites Bamburas, Ala Moana Bowls, Rock Pile, In Betweens and Kaisers.
City crews responded to 2171 Ahe Street at around 10:30 p.m. trying to clear blockage in the sewer line.
State health and city officials say the sewer pipe was blocked by tricycle parts, bike parts, clothing, rocks and sticks.
"Some of the feedback from the field crews is that we have boulders inside there the size of the pipe and how we get that out, I'm not exactly sure. It's very difficult," said City Environmental Services Director Lori Kahikina.
City crews removed the blockage around 8:15 p.m. They were unable to release the blockage earlier because private construction interfered with access to a manhole downstream.
Palolo residents were told to cut back on water usage. That means no large loads of laundry and avoid using the dishwasher.
"The only thing that should go into the sewers is number one, number two and toilet paper. No toys, no other debris, no clothing, diapers, diaper wipes, nothing," said Kahikina.