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. SDCI has prepared multiple training materials to help prepare applicants that are posted on the website. We are also hosting virtual Q&A sessions each Wednesday in July and August at 2:00 p.m.
The 2021 Stormwater Code and Manual update is on track to become effective on July 1, 2021. The new rules will replace the current Stormwater Code and Directors’ Rules, which are administered jointly by SDCI and Seattle Public Utilities (SPU). For more information, visit our Updating Stormwater Regulations Background page. Draft documents of the revised rules and summary of the Stormwater Code changes are available on the Updating Stormwater Regulations Project Documents page. You can find recordings from three of the Public Meetings that highlighted the code changes on the Updating Stormwater Regulations Get Involved page.
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.
Our stormwater code protects people, property, and the environment by controlling how rainwater runs off of streets, buildings, and parking lots. This stormwater runoff can cause flooding, landslides, and erosion that can damage our homes, businesses, and property. Stormwater is also the main source for pollutants in our creeks, lakes, bays, and other waterways.
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).
We are updating our Stormwater Code. The proposed amendments to the Stormwater Code include several changes, including: modifying on-site list requirements; making technical corrections; and clarifying submittal requirements for projects.
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.
We’re offering two free training sessions to help applicants with the 2016 Stormwater Code. September 22 and October 16, both are in Seattle Municipal Tower 8:30 – 9:30 am. The trainings will cover: The List Approach Calculator; Drainage Standard Plans; Infiltration Testing and Infiltration BMP’s; and more.
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!
Want to let us know what you think about the 2016 Stormwater Manual? Then don’t miss our public meeting on September 30, from 4:30 to 6:00 p.m., in Seattle Municipal Tower (700 5th Ave.), room 2240. The final draft of the 2016 Stormwater Manual will be available on our website before the meeting. The Stormwater Manual is a Director’s Rule that interprets the Stormwater Code requirements. Director’s Rules are binding rules adopted according to the administration section in the Seattle Municipal Code.
City Council has scheduled a public hearing on the 2016 Stormwater Code Update for August 11, 2015. The meeting is scheduled for 2:00 p.m. in Seattle City Hall Council Chambers. The draft documents of the 2016 Stormwater Code and other project applicability code changes are available for your review on our website.