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.