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Stormwater Code & Rules Update

We're updating our Stormwater Code.
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?

We just 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 interested in your feedback using our comment form. Please download the form, fill in your comments and email it to stormwatercode@seattle.gov by August 15, 2014. You may also email your comments to us directly.

We are revising our existing stormwater code (SMC 22.800-22.808) and the associated Directors’ Rules. 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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