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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 PermitUnless 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.
Permit
Modification Includes the draft permit modification and comment letters for Ecology’s process to modify the permits from March 18, 2009 to June 17, 2009
Developing
Low Impact Development (LID) Standards
2009 Notice of
Issuance: Phase I Municipal Stormwater General Permit Previous permit documents (2007 and 1995).
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