The City of Seattle Stormwater Code and Manual became effective July 1, 2021. Please visit our Stormwater Code website as a great deal has changed with this update.
We know there will be a lot of questions about the changes, so we are hosting live question and answer sessions every Wednesday this August. These are small, informal sessions to answer any question that you have.
SDCI has also prepared online training materials that you can view at any time.
The draft documents of the 2021 Stormwater Code and Manual, supporting documentation, and other related project code changes are available for your review on the project documents page. The official public review period for these documents was April 1 – May 16, 2020, but we are still interested in your comments. Visit the get involved page to find the template and instructions for submitting your feedback. We will hold another official comment period in the Fall/Winter of 2020.
The Department of Ecology is requiring Seattle to update our current codes with additional stormwater control regulations as a condition of our NPDES permit. To meet these requirements, we are revising our existing Stormwater Code (SMC 22.800-22.808) and the associated Stormwater Manual (Directors’ Rule 17-2017). These new rules will replace the current drainage control code and Directors’ Rules which are administered jointly by SDCI and Seattle Public Utilities.
We’ve updated Best Management Practices (BMPs) in the City of Seattle Stormwater Manual to more specifically address polychlorinated biphenyls, commonly known as PCBs, and other toxics. The updated BMPs are C1.25, C1.30, and C-1.50. We are making this change to reflect new information that has become available on PCBs in building materials.
The 2016 Stormwater Code became effective on January 1, 2016. The City of Seattle is offering a series of free training sessions to assist builders and designers with implementing the 2016 Stormwater Code. Be sure to register soon because classes are filling up quickly!
We updated two Tips on tenant rights and finalized five director’s rules, including the stormwater manual and fee subtitle rules.
