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King Street Center
201 S. Jackson St., Suite 500
Seattle, WA 98104-3855
Phone: 206-684-1280
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

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Staff Contacts
Puget Sound shoreline next to the West Point Treatment Plant, Seattle

King County permits for treating and conveying water resources

King County conveys treated water to Puget Sound and to beneficial uses from its regional wastewater conveyance and treatment system under permits issued by the Washington State Department of Ecology (Ecology).

NPDES Permit Description

NPDES Permit no. and expiration date

Reclaimed water 
permit no. and
expiration date
Regional plants    
Brightwater Treatment Plant, near Woodinville WAThe Brightwater Treatment Plant permit covers the operation of the Brightwater Treatment Plant near Woodinville and the portion of the conveyance system owned by King County.

WA--0032247
July 31, 2016

Download permit*
(Ecology Web site)
Permit;
Fact Sheet

ST0045498,
July 31, 2016

Download permit*
(Ecology Web site)
Permit;
Fact Sheet

South Treatment Plant, Renton WAThe South Treatment Plant permit covers the operation of the South Treatment Plant in Renton and the portion of the conveyance system owned by King County.

WA-002958-1
Oct. 31, 2014

Download permit*
(Ecology Web site)
Permit;
Fact Sheet

ST-7445,
Oct. 31, 2014

Download permit*
(Ecology Web site)
Permit;
Fact Sheet 

West Point Treatment Plant, Seattle, WAThe West Point Treatment Plant permit covers the operation of the West Point Treatment Plant in Seattle, the combined sewer overflow (CSO) system, the CSO treatment facilities including Alki, Carkeek, Elliott West, Henderson/Martin Luther King, and the portion of the conveyance system owned by King County.

WA-002918-1
June 30, 2014

Download permit*
(Ecology Web site)
Permit;
Fact Sheet

  
Local plants  

Carnation Treatment Plant, WAThe Carnation Treatment Plant permit covers the operation of the Carnation Treatment Plant and the portion of the conveyance system owned by King County.

 

WA-003218-2
April 15, 2013

Download permit*
(Ecology Web site)
Permit;
Fact Sheet

ST-7450
Dec. 29, 2013

Download permit*
(Ecology Web site)
Permit;
Fact Sheet

Vashon Treatment Plant, Vashon Island, WAThe Vashon Treatment Plant permit covers the operation of the Vashon Treatment Plant and the portion of the conveyance system owned by King County.

 

WA-002252-7
Aug. 31, 2016

Download permit*
(Ecology Web site)
Permit;
Fact Sheet
Photo to be provided.
Beulah Park/Cove community wastewater treatment system on Vashon Island.
Department of Health
Permit # KIN005,
Oct. 1, 2012
Permit 

Note: Also covered under these permits is the Industrial Pretreatment Program administered by King County. That program is responsible for approving permits for discharges of industrial waste into the sewer system and the management and enforcement of such permits.

* Requires a PDF Reader to view document. If link doesn't work, refer to Ecology's list of permits at:
http://www.ecy.wa.gov/programs/wq/permits/wwdischargepermits.html.

News releases

Other NPDES permits held by King County

Other county resources and information

For more information

  • Please contact Wastewater Treatment Division NPDES Administrator Betsy Cooper at 206-263-3728.