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Stormwater System Information
National Pollutant Discharge Elimination System (NPDES)
The National Pollutant Discharge Elimination System (NPDES) is a federal permit that regulates stormwater and wastewater discharges to waters of the state. While it is a federal permit, the regulatory authority has been passed to Washington State Department of Ecology (DOE).
The permit, which became effective February 16, 2007, authorizes the discharge of stormwater to surface and ground waters from Duvall's storm drainage system. Requirements of the permit include the development of a Stormwater Management Program (SWMP) which details the actions and activities to be implemented by the city in order to reduce the discharge of pollutants. While the permit went into effect in February 2007, the permit itself phased program implementation requirements out over the next 4 years.
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:
The National Pollutant Discharge Elimination System (NPDES) is a federal permit that regulates stormwater and wastewater discharges to waters of the state. While it is a federal permit, the regulatory authority has been passed to Washington State Department of Ecology (DOE).
The permit, which became effective February 16, 2007, authorizes the discharge of stormwater to surface and ground waters from Duvall's storm drainage system. Requirements of the permit include the development of a Stormwater Management Program (SWMP) which details the actions and activities to be implemented by the city in order to reduce the discharge of pollutants. While the permit went into effect in February 2007, the permit itself phased program implementation requirements out over the next 4 years.
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
Applications
Construction projects that disturb more than one acre need a Construction Stormwater General Permit.
SWMP Annual Reports
2021 SWMP Report (DRAFT)2020 Submittal Certification Record
2018 Submittal Certification Record
2017 Submittal Certification Record
2016 Submittal Certification Record
2015 Submittal Certification Record
Additional Reports
- 2018 Stormwater Facility Maintenance Manual
- 2018 Surface and Stormwater Management Plan (FINAL)
- 2016 King County Surface Water Design Manual
- 2016 Maintenance Yard Stormwater Pollution Prevention Plan
- 2012 Assessment of Residential and Business Understanding and Adoption of Targeted Stormwater
- 2009 Stormwater Research Report
Contact Us
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425.939.8040
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
Office
14525 Main Street NE
Duvall, WA 98019
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