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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

Puget Sound Beach CSO Control Projects

CSO control needs in the project basins

As part of its CSO Control Program, King County is identifying CSO control approaches for the four project basins along Puget Sound in Seattle. These locations are top priority because people are most likely to come in contact with water during recreational activities such as swimming.

State Department of Ecology regulations require CSO facilities to have no more than one CSO event per year. These CSO facilities do not meet this requirement at this time. Overflows below are based on a 7-year average, reported to DOE in 2008.

Beach CSO map
  • South Magnolia - South Magnolia discharged on average 19 times each year, a total of 31 million gallons per year.
  • North Beach - North Beach discharged on average 10 times each year, a total of 2.2 million gallons per year.
  • Barton - Barton discharged on average 4 times per year a total of 4 million gallons into Puget Sound off Fauntleroy.
  • Murray - Murray discharged on average 5 times per year a total of 5 million gallons off Lowman Beach.

Related topics

notification map
Real time CSO status, Seattle (King County CSOs)

Regulatory agencies

  • View project library page for CSO resources by Washington State Department of Ecology and Environmental Protection Agency