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Stormwater Code & Rules Update

An Example of Stormwater Control Methods
Our Stormwater Code protects people, property, and the environment by controlling how rain water runs off of streets, buildings, and parking lots.
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Background

In May 2014, we published the Draft April 2014 City of Seattle Stormwater Manual, Volumes 1 through 5, and the appendices. 

Originally, we anticipated making all the changes at one time in 2015, as we had stated in handouts and at various public meetings throughout 2014. However, the Washington State Department of Ecology (Ecology) was delayed in sending their comments to us on our draft proposal. We received over 150 separate comments from Ecology in February 2015. Therefore, due to the delay, we postponed most of our proposed Stormwater Code changes until January 2016.

In the meantime, in April 2015, the City Council and Mayor approved to revise three sections of the 2009 Stormwater Code (SMC 22.800-22.808). Effective by May 24, 2015. These changes are not the focus of Ecology's review. The changes are:

  • Changing water quality thresholds for roadway projects
  • Exempting Seattle Public Utilities (SPU) water utility projects from flow control, water quality treatment, and green stormwater requirements
  • Granting the Director of SPU discretion to not require flow control requirements for certain combined sewer basins through a Directors' Rule

We posted an addendum to the Stormwater Code and Rule Update SEPA Environmental Checklist on June 25, 2015. We identified a need to propose related revisions to the 2012 Seattle Building Code, the 2012 Seattle Residential Code, and those Seattle Municipal Code titles regulating land use and grading to incorporate the new ecology requirements. These proposed revisions relate largely to the timing of how the Stormwater Code and Rule Update would be imposed (generally referred to as "applicability.") In addition, we identified two additional proposed revisions in the Stormwater Code and Rule Update. 

A public meeting about the 2016 Stormwater Manual was held at the Seattle Municipal Tower on June 10, 2015. The final draft of the Stormwater Manual was made available in September 2015 and advertised in the Daily Journal of Commerce. We also submitted the September 2015 final draft version to Ecology for their review and approval.

A public hearing on the 2016 Stormwater Code and related code changes (CB 118465, CB 118466) was held at the Seattle Public Utilities and Neighborhoods Committee on September 11, 2015. The code changes are available on the Project Documents page. The City Council approved the revisions outlined in the council bills in September 2015.

We posted the final 2016 Stormwater Manual in November 2015 for use by the public.

Refer to our timeline page for further information on the effective date of the 2016 Stormwater Code and Manual. 

Documents

Best Available Science Report

State Environmental Policy Act (SEPA) Documents 

Stormwater Redline Documents

The following redline versions of the Stormwater Manual show the changes between the September 2015 draft of the Stormwater Manual and the final 2016 Stormwater Manual.

There were no changes between the September 2015 version and the final 2016 Stormwater Manual for:

  • Appendix B – Chemical Treatment (no changes from September 2015 version)
  • Appendix I - Integrated Pest management  (no changes from September 2015 version)

Final Draft Stormwater Manual

We submitted a final draft of the Stormwater Manual to Washington State Department of Ecology on September 21, 2015 for their final review and approval. The redline versions show the changes made since the April 2014 version:

Draft Stormwater Manual

Draft documents for the 2016 City of Seattle Stormwater Code and Manual (submitted to Washington State Department of Ecology April 23, 2014):

The following documents outline the April 2014 summary of changes we made to the 2009 Stormwater Code and Manual:

Codes & Directors' Rules

Previous Public Meetings

Public Meeting: September 30, 2015

We hosted a public meeting on September 30, 2015 about the 2016 Stormwater Manual Update. The draft documents of the 2016 Stormwater Manual and the other related code changes are available on the project documents page.

Here are the documents from the meeting:

Public Meeting: June 10, 2015

We hosted a public meeting on June 10, 2015 about the 2016 Stormwater Code Update. The draft documents of the 2016 Stormwater Code and the other related code changes are available on the project documents page

Here are the documents from the meeting:

People who attended the meeting represented various engineering and architecture firms, as well as City of Seattle staff. The attendees provided valuable feedback and questions for us to evaluate during the comment period.

Public Meeting: June 3, 2014

We hosted a public meeting on June 3, 2014 about the Stormwater Code and Manual Update. Here are the documents from that public meeting:

 

Meetings & Events


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