Wastewater/Sewer

Wastewater Pump Station 1Overview

The City of Redmond Wastewater Maintenance Division maintains and operates the wastewater (sewer) system to meet the needs of existing and future customers. The wastewater system serves a residential population of 69,900 (2020) within the City limits and approximately 3,500 residential households in the Novelty Hill area.

City staff maintain the wastewater system in a manner that protects the public investment, protects the environment and human health, ensures compliance with state and federal mandates, and ensures that reliable service is available to all customers of the City utility system.

Wastewater staff provide information to commercial customers and residents about the treatment and reduction of grease and industrial discharges to the wastewater system to ensure compliance with pre-treatment standards. Wastewater Division staff also collaborate with Utility Engineering staff on long-range system development and comprehensive planning, the capital facility program, and feasibility studies.

  1. Lift Station Program
  2. Maintenance & Repair
  3. Technology

What: Replace or rehabilitate ten wastewater lift stations in six years. At the start of the program, the Sewer Utility owned and operated 23 lift stations throughout its service area (see map for locations; stations identified for replacement are numbered). With the completion of the Lift Station 14 abandonment project, there are now 22 wastewater lift stations.

When: Now–2025 

Why: If a lift station fails there is a risk that raw sewage will back up into homes or businesses, or overflow into Lake Sammamish and other natural waterways. Ten wastewater lift stations are at, or past, their useful life. Mechanical and electrical equipment in lift stations usually lasts 20-30 years. Some of the lift stations are over 30 years old, some are failing now, and some have equipment for which replacement parts are no longer available.

How: The sewer lift stations will be replaced using sewer rates, development connection charges, and bonded debt so that the stations are in good working order by 2025.

Progress: In 2019, Lift Station 2 was replaced and Lift Station 14 was abandoned and a new sewer line installed. Lift Station 3 was replaced in 2020 and work on Lift Station 13 started.

What is a lift station?

Due to hills and valleys in the landscape, sewer systems include locations where sewage needs to be pumped from low points to higher elevations, from which it will ultimately flow via gravity to a King County treatment plant. Once sewage arrives at the treatment plant it is treated and discharged to Puget Sound.

Current pump station project pages

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  3. Can I flush wipes (cleaning, facial, or baby wipes) down the toilet even if they're labeled "flushable"?
  1. What can I do to prevent sanitary sewer back-ups?
  2. What causes a sewer to back-up?
  3. Can I plant over manholes or clean outs in my yard?
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