The Side Sewer Is The Main Drain Line Or Pipe That All Other Drains Feed Into.

This drain line carries wastewater from the sinks, tubs, toilets, dishwashers, wash machines, laundry, and other drains to the city sewer line in the street.

Lower Level

When a side sewer line is plugged, it will generally back up at the lowest point of the home or building. For example, in a two-story house with a washing machine in the basement, a backup might display first in the laundry room drain, the lowest level of the home. We find that backups are also often reported in the basement shower or toilet.

Save the Day

When a side sewer backup occurs, a Raymark Plumbing & Sewer technician will attempt to clear it, removing obstructions and getting the line back up and running. We use the word ‘attempt’ because sometimes the line has collapsed or broken away from the rest of the pipe. If this happens, repairs to the line or replacement of the line may be needed.

Prevent Backups

Prevent backups by taking care of your side sewer line and paying attention to any slow drains or clogs. Call Raymark Plumbing & Sewer to help diagnose when a clog is a plumbing problem or when it is a sewer problem. For example, if an upstairs bathroom sink is clogged, and all other sinks and tubs are draining fine, this is most likely an isolated clog in the sink’s drainpipe and not a side sewer clog.


  • Suppose your line has given you problems in the past, schedule annual maintenance. We can clear the line of tree and shrub roots and make recommendations to help keep your line in good condition.
  • Discuss what can and cannot be put down the drains with your family or housemates. Only flush the 4 Ps down the toilet: toilet Paper, Pee, Poop, and Puke.
  • Never flush wipes, paper towels, rags, tampons, pads, etc. These are a significant source of clogs. Put garbage in the garbage can and not in the toilet drain.
  • Avoid putting oils and fats in the garbage disposal and sinks. These can clog drainpipes.

Raymark Plumbing & Sewer Experts

If problems arise, Raymark Plumbing & Sewer is happy to provide solutions. We are the Seattle experts in drain cleaning, side sewer maintenance, and side sewer line repairs and replacement. Raymark Plumbing & Sewer is also a registered City of Seattle side sewer contractor. We can help. Call us at (206) 440-9077.

Side sewer lines are the homeowner’s responsibility, up to the property line. The City of Seattle is responsible for the sewer lines beyond the property line and in the street.

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