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9611 SE 36th Street
9601 SE 36th Street
Mercer Island, WA 98040
Phone: 206.275.7608
Fax: 206.275.7814
Contact: Maintenance Department
Email: mi_maint@mercergov. . .
Hours: 7:00 AM - 3:30 PM (Mon-Fri)
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City of Mercer Island / Maintenance / Sanitary Sewer Utility

Sanitary Sewer Utility

Jetting sewer lines
Jetting sewer lines
The City of Mercer Island has nearly 10,000 single-family residences, multi-family housing units, businesses and schools connected to our sanitary sewer collection system. Sewage, the wastewater generated from bathrooms and kitchens in these structures, runs through more than 500,000 lineal feet of pipe around the Island. It is pumped through 18 sewage pump stations to the King County/Metro southeast and north-end pumping stations and then across Lake Washington for sewage treatment. 

What the City Does  

Mercer Island Utility crews clean the sanitary sewer collection system regularly with a high-pressure jetting and vacuum process. They use special cameras to inspect the lines for breaks or blockage due to fats, oil and grease (FOG) or tree roots. They routinely test the pumping station auxiliary power systems. And, they perform all work in accordance with strict City, State and Federal rules and regulations. 

Click here to view the most current version of the Sanitary Sewer Standard Details.

Fats Oil Grease, Keep the Drains Clean on Mercer Island
Fats Oil Grease, Keep the Drains Clean on Mercer Island
What You Can Do


Help us keep FOG out of Mercer Islandís sanitary sewer system.

  • Never pour grease or put food waste down the drain or toilet.
  • Pour leftover cooking oil and grease into a can and put it in the trash.
  • Use our handy food scraper to scrape leftover food into your compost or trash.
  • Pick up your free scraper at the Utility Billing Desk at Mercer Island City Hall, 9611 SE 36th Street on Mercer Island. 

Click here to view a video about what should and should not be flushed down the tiolet.
Video credit: City Cable 5 City of Spokane Television




PDF -   SEWERUTILITY2011PUBLIC.PDFSpacer(266.6KB)
Map of pump stations and sewer flow in Mercer Island
 

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