Jetting sewer lines

There are 7,200 single-family residences, 1,300 multi-family units and 155 business and schools connected to the sanitary sewer collection system. Sewage is piped through 520,000 lineal feet of pipe and pumped through 18 sewage pump stations to the King County/Metro southeast and north end pumping stations. 

The collection system is cleaned regularly with a high pressure jetting and vacuum process.  Special cameras are used to inspect the lines for breaks or roots.  The pumping station auxiliary power systems are routinely tested.  All work is performed in accordance with City, State and Federal rules and regulations.

UTILITY MAP.PDF(83.8KB) There are two regional pumping stations on Mercer Island, one on the south end and one on the north end of the Island. These stations convey the Island's wastewater to the Renton Treatment Plant.