NPDES Stormwater Permit

SWMP Annual Reports
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2021 Submittal Certification Record
2020 Submittal Certification Record
2018 Submittal Certification Record
2017 Submittal Certification Record
2016 Submittal Certification Record
2015 Submittal Certification Record

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. 

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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!

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.

NPDES Municipal Stormwater Permit

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 Participation
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