
Annual reports to Ecology for the NPDES Municipal Stormwater Permit
King County, Washington
Our Phase I Municipal Stormwater National Pollutant Discharge Elimination System (NPDES) Permit (Phase I permit) requires us to submit an Annual Report to the Washington State Department of Ecology (Ecology). The Annual Report is submitted on or before March 31st and provides information for our previous year’s work.
The Stormwater Management Plan (SWMP), also attached to the Annual Report, provides our plan for complying with the Phase I permit for the year to come. The latest version of the SWMP is posted here.
We invite you to participate in the decision-making processes involving the development, implementation, and update of our SWMP. If you have any questions or feedback about our Annual Report or SWMP, please email us at stormwater@kingcounty.gov.
Annual Reports
- 2021 Annual Report
- 2020 Annual Report
- 2019 Annual Report
- 2018 Annual Report
- 2017 Annual Report
- 2016 Annual Report
- 2015 Annual Report
- 2014 Annual Report
- 2013 Stormwater Monitoring Report and King County Stormwater Monitoring S8.D QAPP
- 2012 Annual Report
- 2011 Annual Report
- 2010 Annual Report
- 2009 Annual Report
- 2008 Annual Report
- 2007 Annual Report
- 2006 Annual Report - no annual report submitted
- 2005 Annual Report
- 2004 Annual Report
- 2003 Annual Report
- 2002 Annual Report
- 2001 Annual Report
- 2000 Annual Report
- 1999 Annual Report
- 1998 Annual Report