NPDES Stormwater Permit

This Drains Here

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 mandate within Federal Clean Water Act, and is issued to the City by the Washington State Department of Ecology.

This permit requires the City to:

  • Provide Outreach and Education–work with people to promote daily activities that reduce stormwater pollution.
  • Inform and involve the public—give people the opportunity to weigh-in on how we meet permit requirements.
  • Respond to spills and seek-out cross-connected pipes--this activity is called an “Illicit discharge detection and elimination” program (Spill Response).
  • Review development projects—ensure stormwater facilities are built to City standards, and that construction activities don’t pollute stormwater.
  • Maintain public and private stormwater facilities—inspect and clean infrastructure, and make repairs if necessary.



Redmond submits annual reports to the Washington State Department of Ecology detailing the actions the City has taken to meet the  permit. See the annual reports below.

Stormwater Management plan

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

City of Redmond welcomes comments and feedback on our current Stormwater Management Program Plan.  Please click on our feedback button.Feedbackicon-words Opens in new window