Holiday closure Monday May 28: Most county offices will be closed in observance of Memorial Day.

For questions about the Wastewater Treatment Division website, please send an e-mail message or contact us at:

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

Get Directions to our office location in Seattle, Washington.

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

Peak performance awards
Excellence in wastewater treatment

King County Wastewater Treatment Division works hard to protect public health and the environment by conveying and treating the region's wastewater. A measure of our success is the recognition by national organizations including the National Association of Clean Water Agencies.

The most recent Peak Performance Award received by our regional and local wastewater treatment plants include:

Regional treatment plant

Year and award

National Association of Clean Water Agencies (NACWA)
formerly called the American Metropolitan Sewerage Agency (AMSA)

logo for Peak Performance Awards
NACWA's Peak Performance Awards program (external link) recognizes NACWA member agency facilities for excellence in wastewater treatment as measured by their compliance with their National Pollutant Discharge Elimination System (NPDES) permits.

Platinum Awards pay special tribute to agency facilities that have received Gold Awards for five consecutive years.

Gold Awards honor treatment works that have achieved 100 percent compliance with their NPDES permit for an entire calendar year.

Silver Awards recognize facilities that have received no more than five NPDES permit violations per calendar year.

 South Treatment Plant, Renton, WA
South Plant

2010 - Platinum 13

 West Point Treatment Plant, Seattle, WA
West Point

2010 - Platinum 9

Local treatment plant Year and award

Carnation Treatment Plant, Carnation, WA
Carnation

2010 - Gold

Vashon Treatment Plant, Vashon Island, WA
Vashon

2010 - Silver

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