Stormwater Services and Information
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.
King County Stormwater Management Program 
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.
Hydrologic and 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.
Stormwater Permit Compliance
Look up technical information related to King County's "National Pollutant Discharge Elimination System (NPDES) permit and how King County is complying with it.
- Annual Municipal NPDES Permit Compliance Report Online
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.
Other Stormwater Related Documents
Stormwater Glossary of Terms and Abbreviations
King County Waterworks Garden Stormwater Facility
Critical Areas Package
Look up King County Stormwater, clearing and grading ordinances.
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Related information
Agencies
News and Features
April 25, 2008
External article, Seattle P-I
Scientists: Rescue plan for Sound falls short
New blueprint neglects stormwater, critics say
March 3, 2008
Low-impact development focus of March 5 ‘GreenTools’ workshop
Feb. 17, 2008
External article, Seattle P-I
Stormwater runoff ranked No. 1 Puget Sound pollution problem
Feb. 14, 2008
Public invited to participate in King County’s Stormwater Management Program planning
Feb. 27 public meeting provides chance to study, comment on new program
 Facility and Permit Compliance in King County, Washington
Dec. 4, 2007
King County responds to wastewater overflows caused by Monday’s rainstorm
Dec. 4, 2007
King County responds to wastewater overflow at Seattle’s Meadowbrook Park
Dec. 4, 2007
External article, Seattle P-I
Climate change could mean more massive downpours
Dec. 3, 2007
Seattle P-I Editorial Board
Puget Sound: Decleansing rain
Nov. 30, 2007
External article, Seattle PI
Runoff called top pollutant in the Sound
Findings prove what many suspected, and may change priorities in cleanup
Sept. 6, 2007
Washington Dept. of Ecology
Cleanup planned for contaminated area on Elliott Bay
Feb. 7, 2007
King County Proposes Global Warming Action Plan
Other cities, counties and private sector urged to join effort
Dec. 13, 2006
External Link, Seattle Times
Puget Sound plan: $12 billion over 13 years
Nov. 8, 2006
External Article, Seattle P-I
Scientists fear for the health of Puget Sound
Experts criticize plan by governor's panel as inadequate
Nov. 6, 2006
King County Executive issues emergency proclamation due to river system flooding
Oct. 11, 2006
External Article, Seattle P-I
Toxic stormwater is one of the Sound's biggest threats
Knowledge goes only so far in controlling polluted runoff
Oct. 27, 2005
King County praised as national leader in addressing climate change
Oct. 26, 2005
Sims outlines efforts to reduce emissions, prepare for global warming
» Critical Areas Package - CAO Resources
Aug. 11, 2004
King County taking steps to reduce potential West Nile virus impact
Jun 25 2004
Serving Island Residents: King County Previews Proposed 2005 Surface Water Management Funded Budgets |
