NPDES Permit Program

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2013-2018 Western Washington Phase II Municipal Stormwater Permit

NPDES Permit Program

The National Pollutant Discharge Elimination System (NPDES) permit program is a requirement of the federal Clean Water Act, which is intended to protect and restore waters for “fishable, swimmable” uses. The federal Environmental Protection Agency (EPA) has delegated permit authority to state environmental agencies. In Washington, the NPDES-delegated permit authority is the Washington State Department of Ecology (DOE).

Protecting Water Quality

City of Tumwater is considered a Phase II community because of its municipality population size. Phase II permits cover urbanized areas of the county where the population is greater than 1,000 people per square mile. The permit allows municipalities to discharge stormwater runoff from municipal drainage systems into the State’s water bodies (i.e., streams, rivers, lakes, wetlands, etc.) as long as municipalities implement programs to protect water quality by reducing the discharge of “non-point source” pollutants to the “maximum extent practicable” (MEP) through application of Permit-specified “best management practices” (BMPs). 

Stormwater Management Plan

The Department of Ecology (DOE) has the delegated responsibility to implement NPDES requirements within the State of Washington.  Under the permit, affected jurisdictions are required to develop and implement a comprehensive Stormwater Management Program (SWMP) that includes, in general, the following components:

  • Public Education and Outreach
  • Public Involvement and Participation
  • Illicit Discharge Detection and Elimination
  • Controlling Runoff from New Development, Redevelopment and Construction Sites
  • Pollution Prevention and Operations and Maintenance for Municipal Operations

2015 Stormwater Management Program (SWMP) pdf-icon-sm

The City of Tumwater’s current Stormwater Permit was issued by the Washington State Department of Ecology in August of 2012, and will expire on July 31, 2018.

2015 NPDES Annual Report pdf-icon-sm

2014 NPDES Annual Report pdf-icon-sm

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