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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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What’s Happening Now?

In May 2014 we published the Draft 2015 City of Seattle Stormwater Manual, Volumes 1 through 5, and the appendices. They are available for your review on the Project Documents page.

We are revising our existing stormwater code (SMC 22.800-22.808) and the associated Directors’ Rules based on the feedback we received from you during our informal comment period that ended August 15, 2014. Our new rules will replace the current stormwater code and Directors' Rules, which are administered jointly by DPD and Seattle Public Utilities (SPU).

Project Benefits

Our stormwater code protects people, property, and the environment by controlling how rain water runs off of streets, buildings, and parking lots. Stormwater runoff can cause flooding, landslides, and erosion that can damage our homes, businesses, and property. Stormwater runoff carries oil and grease, fertilizers, pesticides and other toxic chemicals to our creeks, lakes, bays, river and other waterways.

The End Result

Our regulations will be equivalent to Ecology's 2012 Stormwater Manual and will address the following topics:

  • Improve stormwater management for new Development in Seattle, including Green Stormwater Infrastructure
  • Improve the Construction Site Stormwater Runoff Controls requirements
  • Clarify Pollution Prevention, Good Housekeeping, and Operation and Maintenance
  • Update the Source Control and Water Quality Treatment Practices

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