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Wastewater Treatment

King County, Washington

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: 206-477-5371
Fax: 206-684-1741
Telecommunication device for the deaf (TTY): 711

Get Directions to our office location in Seattle, Washington.

Staff Contacts

Barton CSO Control Project

2015 street schedule for construction

August 17, 2015 Update

Roadside rain garden construction is complete on 15 blocks in the Sunrise Heights and Westwood neighborhoods. You will see crews in the neighborhood replacing any dead plants or trees, and closing off the old storm drains to ensure that stormwater goes into the roadside rain gardens. Maintenance will be ongoing. Read the final newsletter, and watch for an invitation to a celebration on September 20.

2015 street construction schedule (view 2014 schedule)

 2015 construction map



Block updates

7300 block 32nd Ave SW

7300 block 30th Ave SW

7500 block 32nd Ave SW

8100 block 31st Ave SW

8600 block 31st Ave SW

2014 street construction schedule 

Block Updates

7300 block 34th Ave SW

7500 block 34th Ave SW

7900 block 34th Ave SW

7300 block 31st Ave SW

7500 block 31st Ave SW




Block Updates (continued)

7700 block 31st Ave SW

7900 block 31st Ave SW

SW Kenyon St, between 34th Ave SW and 32nd Ave SW

8400 block 34th Ave SW
(Year 2 block moved to 2014)

8600 block 34th Ave SW
(Year 2 block moved to 2014) 

2014 notifications for 2015 streets

Spring 2014 – Fall 2015: Roadside rain garden construction

Street construction includes five major activities:

  • Demolition of existing planter strip
  • Installation of pipes, irrigation, bioretention soil, and vegetation
  • Restoration of curb, street, and existing landscaping as needed
  • Plant establishment (approximately two months)
  • Flow testing and system commissioning


How roadside rain gardens will change over time

Roadside rain gardens change over time as plants mature and become well-established.

How swales will change over time - two examples of Seattle-area bioretention systems