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King County wetlands
Learn about wetlands in King County such as their value to clean water and healthy habitat, reducing floods and supporting biodiversity and find wetland maps, regulations and studies.
Wetland permits, guidelines and regulations
Permits–customer services
Submit your questions online, email or call to pursue permits.
Wetlands - identification of and delineation of boundaries - categories
King County code describing King County's wetland regulations. As of 2024, reference sections include 21A.24.318 through 21A.24.345.
Code violations
Notify the Department of Local Services code enforcement of wetlands getting filled, drained or cleared, 24 hours a day, 7 days a week.
Mitigation Reserves Program
Unavoidable damage to wetlands can be mitigated through this permit program, which enables applicants to pay King County to complete wetland related projects in other places.
Wetland maps and data
iMap interactive map
Open the layer list and select "Environmentally Sensitive Areas" to view wetlands and sensitive area notices on property titles, which include King County wetlands.
1990 King County Wetlands Inventory Notebooks
King County's original wetland survey includes known wetlands in 1990 unincorporated area with aerial photos showing estimated wetland edge, measurements and animal and plant survey data. Scanned notebooks are provided in Adobe Acrobat format:
Wetland science
Beavers in King County
Find the latest on beavers in King County including biology and life history, environmental benefits beavers provide, challenges and solutions, and resources for beaver management such as scientific papers and illustrations.
Characteristics of the low-elevation Sphagnum-dominated peatlands of western Washington: a community profile
Also known as "the bog book", this publication provides a compilation of data and findings about local sphagnum-dominated peatlands.
Wetland documents
Results of search for King County's wetland-related science documents published 1997 to present.