NPDES Stormwater Permit

feedback button Opens in new window

The City of Duvall welcomes comments and feedback on our current Stormwater Management Program. After reviewing the documents and information please provide your feedback by clicking on the feedback button above.  Be as detailed as possible, we value your input!

National Pollutant Discharge Elimination System (NPDES)
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 rivers, streams, and groundwater. This permit satisfies a mandate within the Federal Clean Water Act, and is issued to the City but the Washington State Department of Ecology. 

This permit requires the city to:

  • Provide Outreach and Education: work with people and businesses 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-connection 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.
  • Inspect and maintain public facilities: inspect and clean infrastructure, and make repairs if necessary.
  • Inspect and ensure private facilities are maintained: inspect private facilities and ensure property owners maintain and make repairs if necessary.

Stormwater Management Program (SWMP)

The permit requires that all affected municipalities create and implement a Stormwater Management Program (SWMP) which addresses 5 required program elements:

  • Construction Site Run-Off
  • Illicit Discharge Detection and Elimination
  • Operations and Maintenance of Post Construction Stormwater Facilities
  • Public Education and Outreach
  • Public Involvement and Participatio

Contact Us

  1. when it rains it drains image
    To Report Illicit Discharges or Spills:
    425.419.3748, (after hours, Public Works Emergency Only, Please note this number does not receive text messages) 
    Non-emergency information may also be sent to Email

    14525 Main Street NE
    Duvall, WA 98019
    Directions (PDF)

    Staff Directory