NPDES Permit Program

As a result of regulations in the Federal Clean Water Act (CWA), municipalities are required to comply with a National Pollutant Discharge Elimination System (NPDES) permit. This federal permit regulates wastewater and stormwater that is discharged into U.S. waters and waters of the state, including rivers, lakes, streams, and all underground waters and aquifers.

The Washington State Department of Ecology (Ecology) is the regulatory authority for the NPDES permit. Ecology issued the most-recent NPDES Phase II Municipal Stormwater Permit for Western Washington in August 2019, This permit will cover the period from 2019-2024.

Stormwater Management Program Plan (SWMPP)


One of the requirements of the NPDES permit is the development and implementation of a document that outlines the required Stormwater Program. The Stormwater Management Program Plan (SWMPP), as described in the NPDES Permit, is a planning tool used to describe a municipality's current implementation of the permit, as well as plans for implementing the program in the coming calendar year.

2020 Stormwater Annual Report


The 2020 Stormwater Annual Report is required by the Phase II NPDES permit. The City is finalizing the report  including a review of work completed and adherence to permit requirements. The annual report and referenced attachments are posted below.


Annual Report and Attachments


The report references several attachments, which provide supplemental information about the reporting requirements. Each attachment will be linked below as a separate file, when available.