CSO 26 Facility Tour – Handling Big Storms Beneath the City

Ever wonder what happens to all that water during a heavy rainstorm? On this guided tour of the CSO 26 facility, you’ll go behind the scenes of a massive underground tank designed to prevent sewer backups during big storms. Built in 2021, this 2.2-million-gallon tank fills when rainfall overwhelms the sewer system and safely stores excess water until it can be treated. You’ll learn how the system works, explore the scale of the engineering (imagine 31,000 bathtubs of water!), and discover how the facility is maintained. The tour also includes the plaza above the tank, featuring waterfalls, walking paths, and elements honoring local Native cultures.