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Stormwater Management Program Report,
3/31/2014 Update

The document is available online HERE, at Duvall City Hall, or by calling 425.788.3434.

NPDES Information
What is 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.

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

  1. Public Education and Outreach;
  2. Public Involvement and Participation;
  3. Illicit Discharge Detection and Elimination;
  4. Construction Site Run-Off; and
  5. Operations and Maintenance of Post Construction Stormwater Facilities.

Find Out What You Can Do To Help

Birding Trails, September 2013 PSSH Article

Qualco Digester - August 2013 PSSH Article

Vision Quest, July 2013 PSSH Article

A Healthy Watershed is Everyone’s Business TV Pages   & Brochure, August 2011

Natural Yard Care Summer TV Pages ,  Pages July 2011

Natural Yard Care Spring TV Pages, June 2011

Car washers seeing more rules on soapy runoff, Seattle Times 7/10/09

King County Stormwater Program
Washington State Department of Ecology
Building Soil Foundation for Success


Construction Projects that disturb more than one acre need a Construction Stormwater General Permit (Click Link for more information)

While the Permit went into effect in February of 2007, the permit itself phases program implementation requirements out over the next four years.

The City encourages public comment and participation in the development and implementation of the SWMP throughout the four year process. We plan to utilize the following venues in an effort to keep our residents informed on the progress of the SWMP, so they can provide comments and input as the SWMP develops:

  1. This web page;
  2. Updates through the City's newsletter; and
  3. Future public meetings to let the community provide input.
The City will also try to encourage citizens to assist in ensuring that discharges to the drainage system do not include harmful chemicals. One of the ways to do that will be to stencil reminders similar to the one shown near drains, as well as provide tips on how individuals can cut back on harmful discharges. Please contact Boyd Benson, City Engineer, at 425-788-3434 or Email Stormwater with any questions, comments, or suggestions.

Illicit Discharge Hotline
425.419.3748, (after hours, Emergency Only)
Non-emergency information may also be sent to stormwater@duvallwa.gov
Storm Drain Photograph
Click on the picture for more information

PSSH  Pets Infographic
Click on image for larger version.

2012 SWMP Annual Report
Prepared March 2013

2012 Community Survey

2011 SWMP Annual Report
Prepared March 2012

Maintenance Yard SWPPP
Updated March 2012

2010 SWMP Annual Report

2009 Community Survey

2009 STORM Annual Report

Banner Photo courtesy of Serendipity Photography