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9601 SE 36th Street
Mercer Island, WA 98040
Phone: 206.275.7608
Fax: 206.275.7814
Email: publicworks@mercer. . .
Hours: 7:30 AM - 4:00 PM (Mon-Fri)
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City of Mercer Island / Public Works / Sanitary Sewer Utility

Sanitary Sewer Utility

Jetting sewer lines
Jetting sewer lines
The City of Mercer Island maintains over 105 miles of sanitary sewer lines and approximately 2,400 manholes. Wastewater generated from bathrooms and kitchens is collected and pumped through a series of pump stations and low-pressure mains that convey flows around the perimeter of the island through the Cityís Lakeline sewer system to a King County Department of Natural Resources facility (off island).  

What the City Does

Mercer Island Utility crews are responsible for maintain the public sewer system to ensure a constant and efficient flow of wastewater. Crews utilize special equipment including high-pressure jetting, special cameras to inspect lines for breaks or blockages due to fats, oil and grease (FOG) or tree roots. 

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

Your Side Sewer

Owners of private sewer systems, side sewers, and backwater valves are solely responsible for maintenance and operation of such system. Your side sewer connects the plumbing system from your home or business to the main sewer line. Maintenance and repair of this side sewer is your responsibility.

Clogged sewer pipe
Clogged sewer pipe
Fats, Oil and Grease (FOG)

FOG can clog pipes and can create public health problems. FOG comes primarily from cooking, where fats, oil and grease from rinsing dishes can go down the drain. As the FOG cools in the wastewater system, it builds up along the inner walls of the pipe causing backups. Never pour grease of put food waste down the drain or toilet.

Sources of FOG include:

  • Butter, margarine or shortening
  • Cooking oil or grease from cooked meats
  • Cream, sauces or gravy, soup
  • Mayonnaise or sour cream
  • Food Scraps
Tips to keep your drains free and clear:
  • Put cooled fats, oil and grease into a container and in the trash
  • Before washing, use a paper towel to wipe greasy dishes
  • Use sink strainers to catch food waste during dishwashing
  • Use a food scraper and put food scraps in the compost
  • Donít flush diapers, baby wipes, disposable wipes, napkins or soiled rags down toilets.
Put These in Your Compost:
  • Fruit, vegetables, bread, pasta, grains
  • Eggshells, nutshells
  • Coffee grounds, filters, tea bags
  • Meat, fish, bones, poultry and dairy products


 

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