ALCOSAN and You:  Working Together for Clean Water

Water. It’s our most precious natural resource. At ALCOSAN we believe our mission and our purpose is clear. That’s why we’re working hard everyday to provide you, our customer, with cost-effective, environmentally conscious wastewater treatment that protects the public’s health while enhancing usage of our natural resources.

Learn more about our plans for the future at

ALCOSAN Clean Water Plan

ALCOSAN is thrilled to announce the details of our modified consent decree and updated Clean Water Plan, approved recently by our government regulators. This comprehensive, $2 billion, long-term plan will significantly reduce the overflows of diluted, untreated wastewater into the region’s rivers. It is designed to be affordable, flexible enough to adapt to evolving technology and regional in scale. It will improve the water quality of our local waterways by: expanding the capacity of our North Side treatment plant; making efforts to assume ownership and maintenance of at least 200 miles of multi-municipal sewers; preventing stormwater and groundwater from entering the sewer system through the use of green technology and other source control methods; and upgrading conveyance systems and grey infrastructure.

Learn more about the Clean Water Plan

Review the full Clean Water Plan in PDF formats

ALCOSAN's Annual Open House returns September 21

Saturday, September 21, 2019 marks the return of ALCOSAN's annual award-winning Open House event, FREE and open to the public from 9:00 a.m. to 4:00 p.m., rain or shine! Join us for the region's largest watershed and environmental festival, featuring hands-on environmental exhibits, treatment plant and laboratory tours, microbiology and watershed life demonstrations, and educational activities for all ages!

Save time in line by completing our online registration form today.

Please Note: Open House registration is for entrance into the event only and does not register you for a plant tour. Visitors should proceed to the Tour Ticket tent to get on the tour schedule.

ALCOSAN, Army Corps lead Sheraden Park Green Revival

Drainage from streams add an estimated 2 billion gallons of water into the ALCOSAN sewer system.  In a cooperative effort, the municipalities and ALCOSAN have taken steps to locate, evaluate, prioritize, plan and implement stream removal projects, including one in Sheraden Park.  Partners in the Sheraden Stream Removal and Aquatic Habitat Restoration project ceremoniously turned a valve to mark completion of the project on Saturday, June 1. To learn more about this project and its resulting benefits, click here.

Municipal Users: ALCOSAN has completed its new, secure municipal site.  Authorized users should connect through the "Municipal Login" link at the top right. Logins and passwords have not changed. If you need assistance, please email

ALCOSAN’s 3 Rivers Proud Summer Sweepstakes is open for entries

This year's donated prizes are better than ever in ALCOSAN's 3 Rivers Proud Summer Sweepstakes. Be sure to visit to enter a chance to win tickets to a Carrie Underwood concert, tickets to Sandcastle or the Pittsburgh Zoo and Aquarium, and more. Week One's winner is Karen D. from 15102, who receive a Gateway Clipper Three Rivers Sightseeing Tour for two.

Special Study outlines ALCOSAN's plant expansion

The Allegheny County Sanitary Authority (ALCOSAN) Act 537 Special Study provides an update to the 1996 Act 537 Plan that was adopted by the City of Pittsburgh and approved by the Pennsylvania Department of Environmental Protection. The purpose of the Special Study is to amend the 1996 Act 537 Plan to reflect ALCOSAN’s current strategy for the expansion of wet weather treatment capacity at the Woods Run Wastewater Treatment Plant. The entire Act 537 Special Study can be read here.

ALCOSAN announces leadership in Communications, Governmental Affairs

As ALCOSAN continues its work keeping the region’s rivers and streams clean for generations to come, the authority today announced two leadership changes in an effort to better serve its municipal customers and the community at large. Click here to read more.

Tim Prevost 2017 Civil Engineer of the year Prevost honored as 2017 Civil Engineer of the Year

Working diligently to bring solutions to the region’s issue of overflows caused by excess groundwater and stormwater, ALCOSAN’s Tim Prevost, manager of Wet Weather Programs, is a champion of making our rivers and streams cleaner and healthier through the authority’s Green Revitalization of Our Waterways (GROW) program. Because of his efforts, Prevost has been named the 2017 Civil Engineer of the Year by the Pittsburgh Section of the American Society of Civil Engineers (ASCE). Click here to learn more.

ALCOSAN's GROW Program receives prestigious national award

The program has been selected to receive a 2018 National Environmental Achievement Award by the National Association of Clean Water Agencies (NACWA).  Click here to learn more.

NOTICE: ALCOSAN updates Clean Water Assistance Fund figures

ALCOSAN has updated the income limits used to determine homeowners' eligibility for its Clean Water Assistance Fund. The figures are based on those set by the federal government, and they change each year on February 1. Click here for the latest figures and a list of agencies that take applications from lower-income homeowners for help paying their ALCOSAN bills.

ALCOSAN Announces New Rates, Which are Lower Than Previous Estimates

The Allegheny County Sanitary Authority Board of Directors yesterday approved a four-year rate structure that will pay for the Clean Water Plan to improve the quality of the water in the region’s rivers and streams. These increases are significantly lower than previously estimated.  Click HERE for more information.

Sylvia C. WilsonSylvia C. Wilson Elected ALCOSAN Chair

The Allegheny County Sanitary Authority Board of Directors has unanimously elected member Sylvia C. Wilson as chairperson.  The board also elected ALCOSAN board member Gregory Jones to the position of vice chair and re-elected state Rep. Harry Readshaw as secretary and Jack Shea, president of the Allegheny County Labor Council Executive Board, as treasurer. Click here for more information.

Clean Water Assistance Fund Now Available to Eligible ALCOSAN Ratepayers

ALCOSAN’s Clean Water Assistance Fund, approved by the Board of Directors in October, now is available for eligible residential customers.  Dozens of social service agencies that work with Dollar Energy throughout the region are now accepting applications.  For program details, including eligibility and application procedures, visit our Clean Water Assistance Fund page.

Executive Director Arletta Scott WilliamsALCOSAN Executive Director honored by YWCA

Executive Director Arletta Scott Williams has been awarded the Greater Pittsburgh YWCA’s 2016 Racial Justice Award for business and professional services.  As the first woman and first African-American to lead ALCOSAN, Arletta was among seven recipients honored for commitment to racial equality during the YWCA's signature event. Click here to learn more. 

What Can YOU Do about Sewer Overflows?

Looking for information about wet weather issues and the steps you can take to minimize the flow of stormwater into the collection system?  Download our Sewer Overflows: What Can You Do? brochure HERE to learn more.

ALCOSAN Participates in Major Green Initiative

A joint project of the Pittsburgh Parks Conservancy, ALCOSAN, the Pittsburgh Water and Sewer Authority, and the City of Pittsburgh will result in two pilot projects in the Panther Hollow Watershed designed to manage and minimize runoff naturally through a variety of green infrastructure design components. For complete information, visit our Media Room.

EPA Response to ALCOSAN Extension Request

The Environmental Protection Agency has provided a response to ALCOSAN's proposed Consent Decree schedule change for green infrastructure/flow reduction evaluation.  Related correspondence is available for review here.

ALCOSAN Draft Wet Weather Plan

The ALCOSAN Draft Wet Weather Plan was submitted to the three regulatory agencies on January 29, 2013.   For further details, click here.

Follow ALCOSAN on Facebook

ALCOSAN is on Facebook and Twitter!  To receive news and updates via our social media sites, please click on the logo and choose "like" on the ALCOSAN landing page, or follow us on Twitter at #alcosan

Upcoming Events

SAVE THE DATE: ALCOSAN 2019 Open House -  Saturday, September 21, 2019

ALCOSAN Public Board of Directors Meeting - Thursday, September 26, 2019

view all events

Official Press Releases

ALCOSAN Summer Camps Begin

June 11, 2018 - Always a popular event and completely full this year, ALCOSAN's Summer Science Camp is expecting 59 students in grades 4-5 from 48 different schools in Allegheny County who will take part in the two camps beginning June 11 and June 18.

ALCOSAN Continues Analysis for Clean Water Plan

June 1, 2018 – The Allegheny County Sanitary Authority (ALCOSAN) will be conducting its second round of technical analysis in preparation for a massive improvement plan for cleaner, healthier rivers and streams in the region.

ALCOSAN announces leadership in Communications, Governmental Affairs

May 21, 2018 – As ALCOSAN continues its work keeping the region’s rivers and streams clean for generations to come, the authority today announced two leadership changes in an effort to better serve its municipal customers and the community at large.

Other Press Releases

ALCOSAN in the News

9/18/16 - ALCOSAN shows off with open house  (Post-Gazette)
9/5/16 - Rep. Readshaw receives Municipal Association award  (South Pgh Reporter)
7/1/16 - Get Out:  ALCOSAN's water-quality alert system (Post-Gazette)
6/26/16 - ALCOSAN camp put focus on clean water (Post-Gazette)

For all press releases and news items, please visit the ALCOSAN Media Room

Sewer Overflow Advisory key: Wet Weather overflows have ceased. Rivers, streams and creeks may still be impaired. For more information:

Customer Care at ALCOSAN, we believe it's our duty and privilege to protect, recover and reuse our most valuable resources for the benefit of our customers.

Consent Decree: To comply with provisions set forth in the Clean Water Act, ALCOSAN must meet a series of requirements for planning, design and construction, operation and permitting. For more information

Watershed Education: Leave small leftovers of paint and solvents to dry rather than pouring them down the drain. Learn more

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3300 Preble Avenue
Pittsburgh, PA 15233
(412) 766-4810