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Ecology home > Water Quality > Stormwater > Municipal Stormwater Permits > Permits and Permittees > Phase I Municipal Stormwater Permit

Phase I Municipal Stormwater Permit

The National Pollutant Discharge Elimination System (NPDES) and State Waste Discharge General Permits cover discharges from municipal separate storm sewers. Phase I of the municipal stormwater program went into effect in 1990 and apply to municipalities with populations of more than 100,000.

Ecology issued the original Phase I permits in July 1995. These permits regulated the discharges from municipal separate storm sewers owned or operated by Clark, King, Pierce and Snohomish Counties, and the cities of Seattle and Tacoma. Municipal separate storm sewer systems owned or operated by the Washington State Department of Transportation (WSDOT) located in those counties and cities were also permitted under the 1995 permits. WSDOT now has a separate municipal stormwater permit.

On January 17, 2007 Ecology re-issued the Phase I municipal stormwater permit with an effective date of February 16, 2007. Ecology modified the permit on June 17, 2009 to implement the outcomes of appeals. July 17, 2009 is the effective date for permit modifications.

Phase I Permit

Issued January 17, 2007, Modified June 17, 2009, Modified September 1, 2010

• Phase I: Municipal Stormwater NPDES and State Waste Discharge General Permit

  • Appendix 1: Minimum Technical Requirements for New Development and Re-development
  • Appendix 2: TMDL Requirements
  • Appendix 3: Annual Report Form for Port of Seattle and Port of Tacoma
  • Appendix 4: Annual Report Form for Secondary Permittees
  • Appendix 5: Notice of Intent
  • Appendix 6: Street Waste Disposal
  • Appendix 7: Determining Construction Site Sediment Damage Potential
  • Appendix 8: Urban Land Uses and Pollutant Generating Sources
  • Appendix 9:  Laboratory Methods
  • Appendix 10: Equivalent Programs for Runoff Controls for New and Redevelopment and Construction Sites
     

• Fact Sheet

  • Appendix A: List of Potential Secondary Permittees for Western Washington
  • Appendix B: List of Applicable TMDLs in Western Washington
  • Appendix C: Monitoring Program Cost Estimate
  • Appendix D: Response to Comments, 2007
  • Appendix E: Permit Modification Fact Sheet for Phase I and Phase II Stormwater General Permits, March 18, 2009
  • Appendix F: Response to Comments on Permit Modification for Phase I and Phase II Stormwater General Permits, June 17, 2009
  • Appendix G: Permit Modification Fact Sheet for Phase I Stormwater General Permit, September 1, 2010
  • Appendix H: Response to Comments on Permit Modification for Phase I Stormwater General Permit, September 1, 2010

Unless otherwise specified, documents are available in Adobe Acrobat (.PDF file) format. To view and/or print PDF files, you first will need to download and install Adobe Acrobat Reader from this link.

2012 Permits Reissuance Process

Permit Modification - (2009 and 2010)

Developing Low Impact Development (LID) Standards

2009 Notice of Issuance: Phase I Municipal Stormwater General Permit

Permit History

Previous permit documents (2007 and 1995).

Permittee Resources and Guidance

Annual Report Forms and Guidance

Contact us for more information

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Last updated June 2009

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