The National Pollutant Discharge Elimination System (NPDES) Permit (Permit) 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 the Washington State Department of Ecology (Ecology). The first Western Washington Phase II Municipal Stormwater Permit was issued by Ecology in January of 2007. The current permit term is five years, beginning Aug. 1, 2019, and ending July 31, 2024.
The Permit requires that all affected municipalities create and implement a Stormwater Management Program (SWMP) which addresses five required program elements:
Public Education and Outreach
Public Involvement and Participation
MS4 Mapping and Documentation
Illicit Discharge Detection and Elimination
Controlling Runoff from New Development, Redevelopment and Construction Sites
Operations and Maintenance
Source Control Program for Existing Development
Select cities, such as the City of Marysville, are required to provide additional actions applicable to Total Maximum Daily Load (TMDL) requirements.