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

King Street Center
201 S. Jackson St., Suite 505
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.

A list of Peak Performance Awards received by our two regional wastewater treatment plants since 1997 include:

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.

Aerial photo (2002) of King County West Point Treatment Plant, Seattle, WA
West Point

2008 - Platinum
2007 - Platinum
2006 - Platinum
2005 - Gold
2004 - Gold
2003 - Gold
2002 - Gold
2001 - Silver
2000 - Gold
1999 - Gold
1998 - Gold
1997 - Silver

Aerial photo (2009) of King County South Treatment Plant, Renton, WA
South Plant

2008 - Platinum
2007 - Platinum
2006 - Platinum
2005 - Platinum
2004 - Platinum
2003 - Platinum
2002 - Platinum
2001 - Gold
2000 - Gold
1999 - Gold
1998 - Gold
1997 - Silver

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