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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

Wheels to water

Who is eligible? | Scheduling & confirmationsThe busesCosts

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Who is eligible?

  • King County school groups with a minimum free and reduced lunch rate of 25 percent
  • Group sizes of 20-70 people
  • Only eligible for participating field trips
  • A teacher can request a second bus for their class to a different program in the same school year if the school has a minimum free and reduced lunch rate of 50 percent

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Participating programs

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Scheduling and confirmations

  • Field trip programs must be scheduled prior to requesting a bus – your scheduler will then direct you to register here  
  • Three weeks advance scheduling required
  • King County wastewater treatment works with Metro transit to arrange all details of time and pick up/drop off location(s).
  • A confirmation will be emailed 1-2 weeks before your trip with an attached transit report.
  • Before your trip, print 2 copies of the transit trip report and 2 copies of the wheels to water document (PDF)

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The buses

  • Metro buses – standard 40 passenger coach or large 70 passenger coach
  • Buses are available Monday-Friday between 8 a.m. and 3 p.m.
  • Buses will often continue providing regional  transportation in the middle of the day and will leave the field site after drop-off and return for afternoon  pick-up
  • More about what to expect on the day of event (PDF)

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  • When approved, your bus is free. King County and Metro Transit take care of all cost logistics.
  • This program is funded by water and sewer rates to support regional access to education about wastewater treatment, water and nutrient recycling and choices that are made every day at home that impact the sewer system, treatment plants and regional water quality.

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Education resources

Education program questions: contact Casey Plank at 206-477-5448 or

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