Treatment Plant Tours

Wastewater Treatment Plant Tours provide information that helps protect and support the regional sewer system and our local environment.

Tours are free for school classes and other groups and available Monday through Saturday, between 9 a.m. and 4 p.m. Two weeks advance notice is requested.

Scheduling a tour

• General information
• Treatment plant locations
• Request a tour
• Prepare for your tour
• Nearby points of interest
• Extend your plant tour with a school field trip

General information

• Determine which treatment plant you would like to visit
• All youth 18 years of age and younger must have accompanying chaperones
  • Ages 3-9 must have accompanying parent/guardian
  • Grades 4-5: 1 chaperone for every 6 youths
  • Grades 6-8: 1 chaperone for every 8 youths
  • High School: 1 chaperone for every 10 youths
• Tours are available on a first-come, first-served basis
• Two weeks advance scheduling required
• Advance notice is required for accessible tours and accommodations
• Tours take approximately two hours and include a half hour presentation followed by a walking tour. Tours require a minimum of one hour.
• Tours can accommodate 20 visitors per available King County tour guide
• Tour days and times may fluctuate based on King County staff availability

Treatment plant locations

Find a treatment plant closest to you: determine which service area you live in:

• South Treatment Plant - Renton, WA
• West Point Treatment Plant - Seattle, WA (Discovery Park)
• Carnation Treatment Plant - Carnation WA
• Vashon Treatment Plant - Vashon, WA

Request a tour

• Request a tour using our online form.

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Prepare for your tour

• View the Participant Information guidelines for the tour program.

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Other points of interest near King County treatment facilities

West Point

• Extend your plant tour with a school field trip.

  Discovery Park Environmental Learning Center (external link)
• Daybreak Star Cultural Center (external link)
• West Point Beach and Lighthouse (external link)
• West Point geology and archeology (external link)

South Plant

• Waterworks Gardens
• Black River Riparian Forest and Heron Rookery (external link)

For more information on treatment plant tours, please contact Casey Plank by e-mail or at 206-263-6028.

Updated: Sept. 11, 2008