Are you developing in the City of Sammamish? If you are applying for a land use permit, building permit, or clearing and grading permit, drainage review may be required. Any work or impact to traffic in public right-of-way must obtain a Right-of-Way permit.
The Development Review Engineering team reviews, permits, and inspects the construction of new roads, storm water utilities, right-of-way improvements, and erosion control associated with the development of private property. For more information on the land use and permitting process, visit the Department of Community Development web page.
Public Works Standards and Design Requirements
Public Works Standards
Engineering Plans Standard Notes (Drainage, Grading and Erosion, Roadway)
Surface Water Design Manual and References
See the Maps and GIS Data webpage for flow control, water quality, landslide hazard drainage areas, and erosion hazard areas maps.
Per requirements in Sammamish's Phase II Municipal Stormwater Permit (effective date August 1, 2019), projects permitted under the 2016 SWDM that applied prior to July 1, 2022 and have not started construction by July 1, 2027, and projects permitted under earlier versions of the SWDM that applied prior to January 1, 2017 and have not started construction by January 1, 2022, must be revised to comply with the current stormwater requirements as directed by state regulations. Revisions will need to be approved by the Department of Community Development.
*“Started construction” means, the site work associated with, and directly related to the approved project is at a stage where rough grading is complete or utilities are installed. For rough grading to be considered complete, elevations are within 1 foot of final design elevations.
Drainage Complaints
The drainage complaints map and list are updated and maintained by the Stormwater Team. Use this information to provide documented drainage complaints for a permit application.
Drainage Complaints Map
Drainage Complaints List
**If you need to Report A Spill please use this form, or call the number listed on this page.
Surface Water Checklists, Guides, and Forms
Sammamish Standard Details and Templates
Other Department and Agency Review
Department of Community Development
Department of Ecology
Eastside Fire & Rescue
Northeast Sammamish Plateau Sewer and Water District
Sammamish Plateau Water
Government