Brightwater Treatment Plant tours
Free two-hour walking tours of King County's Brightwater wastewater plant near Woodinville, for ages 9 and up. Individuals register for scheduled tours; groups of 10 to 25 book ahead.
Ways to visit
Wastewater treatment plant tour Open
- What you see
- Inside tourkingcounty.gov, 2026-11-05
- How
- Scheduled tour, Groups only · groups of 10–25 · about 2 hourskingcounty.gov, 2026-11-05
- When
- Community tours for individuals and families are listed on the county's events page; dates are not given on the tours page. Group tours (10 to 25 people) are scheduled to staff availability.kingcounty.gov, 2026-11-05
- Booking
- Required · online or by emailPre-registration is required, 2 to 4 weeks in advance for groups. Individuals register for an upcoming community tour through the events page.Book ↗kingcounty.gov, 2026-11-05
- Cost
- Freekingcounty.gov, 2026-11-05
- Requirements
- Minimum age: 9+. Minimum age 9.
- Safety gear: Yes. Long pants and closed-toed shoes; the tour is outside and in an industrial setting.
About
King County's Brightwater plant treats wastewater for the north part of the region and offers tours on how wastewater becomes reusable water, energy and nutrients. A tour lasts two hours, with a 30-minute introduction and a walk outside and in an industrial setting, so long pants and closed-toed shoes are required. Individuals and families register for scheduled community tours listed on the county's events page; larger groups can request their own dates.
Owner: King County. Run by: King County Wastewater Treatment Division.
Getting there
22505 State Route 9 SE, Woodinville, WA, 98072
The plant also has trails and an education center, the Brightwater Center, with exhibits and community programs; their hours are not given on the visiting page.
The pin marks the site itself, not necessarily the entrance (47.79381, -122.14342). Apple Maps directions go to the street address instead. Show on our map · Google Maps · Apple Maps
Last checked 2026-11-05. Sources are listed below.
Sources
- kingcounty.gov/brightwater · official page · read 2026-11-05For: name
- geocoding.geo.census.gov/geocoder/locations/onelineadd… · US Census Bureau geocoder · read 2026-11-05For: location
- kingcounty.gov/en/dept/dnrp/waste-services/w… · official page · read 2026-11-05For: street address
- kingcounty.gov/en/dept/dnrp/waste-services/w… · official page · read 2026-11-05For: who runs it
- kingcounty.gov/en/dept/dnrp/waste-services/w… · official page · read 2026-11-05For: Wastewater treatment plant tour: open or closed; Wastewater treatment plant tour: what you see; Wastewater treatment plant tour: kind of visit; Wastewater treatment plant tour: days and hours; Wastewater treatment plant tour: booking; Wastewater treatment plant tour: cost; Wastewater treatment plant tour: requirements
Out of date or wrong? Write to hello@industrytours.net.