SPU Water Main Leak and Repair

In the spring of 2024, a leak from the Seattle Public Utilities (SPU) 24-inch diameter water supply line on Mercer Island was discovered. The City Manager declared a Local Emergency due to the reduction in the supply of incoming potable water to Mercer Island, and immediate steps were taken to mitigate the impacts of the leak, ensure safety of the site, and repairs were made to the line over the summer of 2024.

Given the overwhelming cost responsibility held by the City, and the importance of this water supply line, the City began exploring options to replace this segment of the SPU line with a stronger, earthquake resistant supply line in an alternative alignment.

Additional information on the leak and other past issues with the SPU line can be viewed here.