NPDES Stormwater Permit

Give Your Feedback on the 2023 Stormwater Management Plan


Each year the City drafts a Stormwater Management Program Plan, which summarizes how the City plans to meet permit requirements.  View the most recent plan below.

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Please click on our feedback button. 

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The National Pollutant Discharge Elimination System (NPDES) permit requires the City to take numerous actions to reduce the amount of polluted stormwater runoff flowing into our lake, river, groundwater, and streams. This permit satisfies a Federal Clean Water Act mandate and is issued to the City by the Washington State Department of Ecology.

This permit requires the City to:

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Source ControlWork with properties to prevent pollutants from reaching the public stormwater system.

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Respond to spills and seek-out cross-connected pipesthis activity is called “Illicit discharge detection and elimination” (Spill Response).


Address stormwater pollution impacts at the watershed level— identify activities, projects, and land management strategies to protect and restore Redmond's waters.

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Maintain public and private stormwater facilities—inspect and clean stormwater infrastructure and make necessary repairs.


Development review—review development proposals to ensure stormwater facilities are designed and built to City standards and that construction activities don’t pollute stormwater.


Involve the public—provide opportunities for community members to weigh-in on how we meet permit requirements.


Provide Outreach and Educationwork with community members to promote activities that reduce stormwater pollution.


Reporting—report on activities and programs every year.