Employees with King County’s wastewater utility quickly stopped a sewage overflow that began about 1 p.m. at the Kirkland Pump Station in downtown Kirkland.

An estimated 25,000 gallons of wastewater overflowed for 24 minutes into Lake Washington near Kirkland’s Marina Park. The station normally pumps about 6 million gallons of wastewater each day to the county’s South Treatment Plant in Renton.

County staff took water quality samples, posted the beach as closed and notified health and regulatory agencies about the overflow.

Although the cause is under investigation, workers believe debris may have reduced capacity in one of the pumps. Another pump that could have provided backup capacity failed to start. Workers made repairs and the system is again operating normally.

The Kirkland Pump Station has been serving the city’s residents and businesses for more than 40 years. In October, construction began on a project to upgrade the aging facility to better serve this growing community.