Clean Water Plan

Changes and Upgrades Benefiting the Region's Waterways

Working with community leaders and municipalities to reduce the wastewater/stormwater overflow problem.

See Our Plan


Stormwater protection with native plants and gravel
GROW Projects

Green Revitalization of our Waterways

About GROW
Person using a tool to open a utility hole cover
Regionalization Program

Taking responsibility for more infrastructure

See our progress
Stormwater overflowing out of a metal and wood door into an outside runoff area
Preliminary Planning Information

Considering future infrastructure needs

How we plan
Demolition of a small building on the ALCOSAN campus
Plant Expansion Projects

Increasing our treatment capacity

See the changes

Get Involved with ALCOSAN.

There are a variety of different ways to get involved with ALCOSAN throughout the year.

Business Opportunities

We encourage new businesses to work with us.

View open bids

Summer Camp & Educational Experiences

We offer a variety of programs for teachers & families.

See what's available

Attend a Board Meeting

ALCOSAN Board meetings are open to the public.

See the schedule


ALCOSAN Established


Municipalities Serviced


Millions of Gallons of Daily Wastewater Treatment Capacity


Sewer System Miles and Growing

See What's Happening


ALCOSAN Takes Its Famous Open House Virtual for 2020

Authority’s website will feature a weekend of fun activities for all ages

Sep 1, 2020, 1:53 PM

For almost two decades, thousands of visitors have entered the gates of the Allegheny County Sanitary Authority (ALCOSAN) for its famous Open House – a free, daylong environmental festival that teaches, entertains and informs guests of all ages.

Unfortunately, the pandemic will prevent an in-person event this year, but ALCOSAN isn’t going to let that stop us from hosting a virtual Open House on Saturday, Sept. 12, beginning at 9 a.m

Hosted on ALCOSAN’s website – – the virtual Open House will feature many familiar events, such as Mad Buggy Scientist and Science Rocks, along with a new puppet show, virtual lab and plant tours, and much, much more.

“Open House is our signature event where we see repeat visitors and new participants year after year, taking part in a day of fun and learning,” said Arletta Scott Williams, ALCOSAN’s executive director. “We knew that having an in-person event would be nearly impossible but didn’t want to miss the chance to ‘host’ our friends.”

Beginning at 9 a.m., the Open House will be on a featured section of ALCOSAN’s website, and along with the above-mentioned activities, many of the partners that usually are on-site have submitted videos related to their specific organizations.

“I’m so pleased that we will still be able to host our Open House, despite the pandemic,” said Williams. “It is important for ALCOSAN to engage our communities and tell the story of the work the Authority does every day in treating wastewater, an essential service for everyone, but even more so during Covid-19. We’ve been here during the pandemic, making sure that the Authority continues to provide that service.”

ALCOSAN’s virtual Open House will be available throughout the weekend.

Exploration & Education

Educating Our Community

ALCOSAN’s Scholastic Outreach Program provides environmental awareness for students, teachers & communities, all within ALCOSAN’s service area.

A group of school kids gardening