ALCOSAN Annual Open House: Fun and Educational Hands-On Activities, Tours, and Exhibits

23rd Annual ALCOSAN Open House

Circle Saturday, September 13, 2025 on your calendar and join us for the region's largest watershed and environmental festival, ALCOSAN’s award-winning Open House…always FREE and open to the public!

From 9 a.m. to 4 p.m., rain or shine, enjoy a fun-filled day of hands-on environmental exhibits, wastewater treatment plant and laboratory tours, microbiology and watershed life demonstrations and educational activities for all ages!

FREE onsite parking and food provided!

Be the First in Line!

Pre-Register for ALCOSAN’s Open House
Saturday, September 13 · 9 AM – 4 PM

Fun. Free. For the whole family.

Science exhibits, clean water education, plant tours — and a free lunch!

Spots fill fast. Don’t miss out!

Ever Wonder Where It All Goes?

Pre-Register for ALCOSAN’s Plant Tours
Saturday, September 13 · 9 AM – 4 PM

See how we turn dirty water into clean water and protect the Ohio River.

Join our guided tour during the 2025 Open House!

Reserve Your Tour Spot

Every year, visitors flock to the plant to take part in hands-on activities, tours, and exhibits that showcase the amazing work of ALCOSAN and its wastewater treatment processes.

Whether you're a curious student, a science enthusiast, or just someone who loves learning new things, ALCOSAN's open house is the perfect opportunity to explore and discover. You'll have the chance to get up close and personal with the cutting-edge technology that powers ALCOSAN's work, and learn about the important role the plant plays in keeping our waterways clean and healthy.

But it's not just about education - ALCOSAN's open house is also a ton of fun! With a wide variety of activities and exhibits to explore, you're sure to find something that piques your interest. From hands-on experiments to interactive displays, there's plenty of opportunities to engage with the science behind wastewater treatment in a way that's both entertaining and informative.

So if you're looking for a day full of exploration, discovery, and fun, make sure to mark your calendar for ALCOSAN's annual open house - it's an event you won't want to miss!

Open House 2024

Thank 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.

Open House 2021