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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 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).

We just published Volumes 2, 4, and 5 and Appendices B and H of our Draft 2015 City of Seattle Stormwater Manual. They are available for your review on the Project Documents page. We want your feedback. Please visit the Get Involved page for information on how to provide comments. We'll accept comments through July 2014.

On November 7, 2013 we held an open house about the updates we are making to the stormwater code. Please visit the Get Involved page to see documents from that meeting.

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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