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.

• Stormwater runoff pollution
• What are stormwater facilities?
• Stormwater science

Carwash kit
Find out how to build and use a car wash kit to help reduce water pollution in streams, lakes and Puget Sound.

Neighborhood Drainage Assistance Program (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.

Washington State Dept. of Ecology notice of violation to King County
King County received a Notice of Violation from the Department of Ecology.

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.

• Design Manual training
  

• 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
These performance measures track King County's compliance with its surface water management permit among other things.

King County climate change plan
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.

• Model Low Impact Development Strategies for Big Box Retail Stores
• Low-impact development for roads
  Example project for "green building" in the county's transporation infrastructure, incorporating features such as porous concrete sidewalks and a bioretention facility/rain garden.

Other stormwater related documents

• The bog book
• Drainage maintenance standards - self assessment handbook (2005)
• Drainage system maintenance contractor list
• Drainage system design engineer list

Stormwater glossary of terms and abbreviations

King County Waterworks Garden stormwater facility

• Stormwater Journal on-line feature (external link)

Other commonly requested documents

• Stormwater Journal on-line feature (external link)

King County is updating the Surface Water Design Manual (SWDM) and the Stormwater Pollution Prevention Manual (SPPM)

• King County Surface Water Design Manual Update
• King County Stormwater Pollution Prevention Manual

Critical areas package
Look up King County stormwater, clearing and grading ordinances.