Puget Sound Olympia

Municipal Stormwater

Phase I Municipal Stormwater Permit

On August 1, 2012, Ecology issued an updated 2013-2018 Phase I permit, that became effective on August 1, 2013.

The National Pollutant Discharge Elimination System (NPDES) and State Waste Discharge General Permits cover discharges from municipal separate storm sewer systems (MS4s). The Phase I Municipal Stormwater Permit regulates the discharges from MS4s owned or operated by Clark, King, Pierce and Snohomish Counties; and the cities of Seattle and Tacoma (incorporated cities with a population over 100,000 and unincorporated counties with populations of more than 250,000 according to the 1990 census). The permit also applies to MS4s owned by public entities located in a Phase I city or county; including the Ports of Seattle and Tacoma.



2013-2018
Phase I Municipal Stormwater Permit

Redline 2013-2018
Phase I Municipal Stormwater Permit

Redlined changes are compared to the 2010 Modification of the 2007-2012 permit

Appendix 1. Minimum Technical Requirements or New Development and Redevelopment Appendix 1. Minimum Technical Requirements or New Development and Redevelopment
Appendix 2. Total Maximum Daily Load Requirements Appendix 2. Total Maximum Daily Load Requirements
Appendix 3. Annual Report Questions for the Port of Seattle and the Port of Tacoma Appendix 3. Annual Report Questions for the Port of Seattle and the Port of Tacoma
Appendix 4. Annual Report Questions for Secondary Permittees Appendix 4. Annual Report Questions for Secondary Permittees
Appendix 5. Notice of Intent Appendix 5. Notice of Intent
Entirely replaced by 2013-2018 version
Appendix 6. Street Waste Disposal Appendix 6. Street Waste Disposal
Appendix 7. Determining Construction Site Sediment Damage Potential Appendix 7. Determining Construction Site Sediment Damage Potential
Not changed compared to the 2010 permit modification
Appendix 8. Businesses and Activities that are Potential Sources of Pollutants Appendix 8. Businesses and Activities that are Potential Sources of Pollutants
Appendix 9. Stormwater Discharge Monitoring Appendix 9. Stormwater Discharge Monitoring
Entirely replaced by 2013-2018 version
Appendix 10. Equivalent Programs for Runoff Controls for New and Redevelopment and Construction Sites Appendix 10. Equivalent Programs for Runoff Controls for New and Redevelopment and Construction Sites
Appendix 11. Structural Stormwater Controls Project List Appendix 11. Structural Stormwater Controls Project List
New Appendix
Appendix 12. Annual Report Questions for Cities and Counties Appendix 12. Annual Report Questions for Cities and Counties
New Appendix
Appendix A: Response to Comments for Permit Effective August 1, 2013 (August 1, 2012)

 

Regional Stormwater Monitoring Program

2012 Permits Reissuance Process

Annual Report Forms and Guidance

Permit History