Stormwater Utility

Redmond Stormwater Technical Notebook Update (2022)

Redmond Stormwater Technical Notebook Update (2022)

The 2022 Redmond Stormwater Technical Notebook (STN) is now available on this page under Related Documents. 

The 2022 Redmond Stormwater Technical Notebook applies to all complete development applications submitted to the City:

  • On or after July 1, 2022.
  • Prior to January 1, 2017 that have not started construction by July 1, 2022.
  • Prior to July 1, 2022 that have not started construction by July 1, 2027.  

The STN lays out stormwater management requirements for new construction and redevelopment and the edits ensure compliance with the 2019 Stormwater Management Manual for Western Washington. 

StormwaterThe City of Redmond, through its NPDES Municipal Permit, is responsible for ensuring proper maintenance and operation of all public and private stormwater systems within the City. These include 363 miles of pipes, 23,500 catch basins and manholes, 940 vaults, 304 bioswales, 68 miles of streams, and 328 ponds throughout the City.

The Stormwater Utility: 

  • Ensures that public and private stormwater systems are planned, developed and maintained to prevent flooding, protect water quality and preserve natural stormwater systems
  • Monitors water quality and provides leadership and focus for community efforts working toward improved stormwater management
  • Identifies needs for capital improvement of the stormwater systems including streams and habitat, prioritizes, selects, and constructs those improvements
  • Ensures that City construction and maintenance projects are planned and implemented to cause as little short term and long term harm as possible to the environment

Managed by the Public Works Department, Environmental and Utility Services division, the Stormwater Utility funds support engineers, scientists, technicians, inspectors, project managers, and administrative specialists in several divisions within the City's Public Works Department. 

  1. Report an Issue

    Use the City’s request management system to report non-emergency issues, make requests, and find answers to common questions. 
    In case of emergency, call 911.

    Report Issue or Make Request

  1. Customer Service

    Phone: 425-556-2900, ext. 7

  1. Redmond 
    Pollution Hotline

    Report spills and dumping

The City is addressing Stormwater Management in 3 phases:



  • Building & maintaining regional facilities
  • Low Impact Development (LID)
  • Stormwater Technical Notebook
  • Standard specifications & details


  1. Our Environment:
    The Big Picture

    See how we're keeping Redmond clean and green, and learn about the City’s environmental initiatives of Water, Air & Energy, and Land.

Related Documents