Eight decades of clean water
Join us as we celebrate 80 years of protecting Pittsburgh's rivers — and the open house that brings it all to life.
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What is Open House?
Every year, visitors flock to the plant for hands-on activities, tours, and exhibits that showcase the work of ALCOSAN and its wastewater treatment processes. Whether you're a curious student, a science enthusiast, or simply love learning new things, it's the perfect day to explore and discover.
From interactive experiments to the cutting-edge technology that keeps our waterways clean, there's something for everyone — and it's as fun as it is educational.
A legacy worth celebrating
23rd Annual Open House
Thank you, Pittsburgh! Nearly 1,700 of you joined us for our biggest celebration of clean water yet.
From exploring our brand-new outfall to meeting Frankie the Fish, taking the PUP Pledge, and diving into hands-on science — you made it an unforgettable day.
Mark your calendar
September 19, 2026 · 9 AM – 4 PM. Sign up for reminders, parking info, and event updates.
A tide of memories
Previous YearsThank you for making this year's Open House a tremendous success! We hope you learned about what we’re doing through our Clean Water Plan and enjoyed exploring the Plant Tours. We always enjoy showing our littlest scientists how wastewater treatment works and watching them soak it all up through our engaging activities. Everyone’s enthusiasm and participation are truly appreciated! Check out some pictures of this and previous years’ Open Houses below.
Open House 2023
Thank you all for making yet another Open House a resounding success! We hope you gained valuable insights into our Clean Water Plan and thoroughly enjoyed the Plant Tours. Your enthusiasm and participation mean the world to us.
Open House 2022
Thank you to everyone for another successful and fun filled Open House. We hope that you learned about our Clean Water Plan and enjoyed the Plant Tours.
Virtual Open House 2021
Thanks for attending our virtual Open House. We hope you enjoyed the videos, and perhaps learned a little about the important work ALCOSAN is doing. If you didn’t attend our Open House, or want to go back and view something again, we’ve kept the page available.
Virtual Open House 2020
View some of our past videos and educational materials from ALCOSAN's first all Virtual Open House.