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Report a Drainage or Water Quality Problem
Introduction to Stormwater in King County
Learn about the science of stormwater, common problems related to stormwater including causes and solutions, homeowner tips, regulations, and how to get help from King County.
Neighborhood Drainage Assistance (NDAP)
Get technical assistance for questions about construction, permitting, and storm drainage and request capital improvements or repairs to address flooding, erosion and sedimentation problems affecting private property in unincorporated King County.
King County Stormwater Management Program New
Review King County's stormwater program document, take an online survey, and find out about the public meeting to discuss the program.
Surface Water Design Manual Resources
Documents and software to help engineers design storm drainage systems that reduce problems for downstream neighbors and minimize damage to our natural environment.
KCRTS Hydrologic and KCBW Hydraulic Modeling Software
- The King County Runoff Time Series (KCRTS) Hydrologic Model is a required methodology under the 1998 King County Surface Water Design Manual for sizing detention and infiltration flow control facilities.
- The King County Backwater (KCBW) Program is a standard step backwater analysis program for pipe networks, culverts, and simple open channels.
Refer to our Stormwater Facilities page to learn about the types and functions of facilities, and find architectural design tips in the Integrated Pond to help design attractive facilities.
Annual Municipal NPDES Permit Compliance Report
Look up technical information related to King County's "National Pollutant Discharge Elimination System (NPDES) permit and how King County is complying with it.
2005 Stormwater Pollution Prevention Manual
Also known as the BMP manual , this document provides guidance for businesses, public facilities, and other non-residential entities in unincorporated King County on actions we are all required to take to reduce contamination of stormwater, surface water, and groundwater.
Stormwater Resources and References
Links to regulatory agencies, environmental organizations, King County stormwater staff directory, and other resources for information on stormwater and related water resource topics.
Facility and Permit Compliance - King County Performance Measures New
These performance measures track King County's compliance with its surface water management permit among other things.
King County Climate Change Plan New
How King County seeks to reduce greenhouse gas emissions, adapt to projected climate change impacts, and embed mitigation and adaptation into county policy decisions. The plan incorporates issues, goals and actions related to stormwater.
Flooding, stormwater and wastewater breakout session results, King County Climate Change Conference
Review a summary report describing anticipated affects of global warming on flooding, stormwater and wastewater in Washington State with proposed adaptation strategies. Also, look up the flooding, stormwater and wastewater session agenda, presentations, speaker credentials and biographies.
Low Impact Development Reports and Resources (external link)
The Puget Sound Action Team (PSAT) has some great Low Impact Development Information, Reports, and Resources on their Web site.
Other Stormwater Related Documents
Stormwater Glossary of Terms and Abbreviations
King County Waterworks Garden Stormwater Facility
Other Commonly Requested Documents
King County is Updating the Surface Water Design Manual (SWDM) and the Stormwater Pollution Prevention Manual (SPPM)
Critical Areas Package
Look up King County Stormwater, clearing and grading ordinances.
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