Problems at a city of Bainbridge Island pump station caused a sewer spill into Eagle Harbor this week.

Chuck Krumheuer, operations and maintenance manager for the Bainbridge Island Public Works Department, said untreated wastewater spilled into Eagle Harbor over the past few days.

The exact size of the spill is unknown. At the most, Krumheuer estimated, as much as 8,000 gallons may have escaped the city’s wastewater treatment system.

A resident reported the spill just after 8 a.m. Wednesday morning. Krumheuer said the woman had noticed the spill a few days earlier.

“We can’t say for sure when it started,” he said.

Residents and visitors are being advised to avoid contact with the waters of Eagle Harbor through Monday, June 9.

The area has been posted with warning signs, which will come down once water tests show any health threat has passed.

City officials said the cause of the spill was due to a pump station failure in the vicinity of 270 Olympic Drive SE.

The pump station has been repaired and the cause of the failure is under investigation.

Officials also said the spill is unrelated to the effort to upgrade the sewer lines on Eagle Harbor Beach. That project is scheduled to go to bid later this month.