A message from Executive Director Arletta Scott Williams

Behind the fence at ALCOSAN

Other than the individuals who visit ALCOSAN during our annual Open House or on group tours, the vast majority of the residents of the service area ever set foot inside our wastewater treatment plant. That’s why I’d like to describe some of the work that has been going on behind our fence, work that will … Continued

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Thanks for visiting ALCOSAN

ALCOSAN’s 15th annual Open House was a huge success, and I must admit that this no longer surprises me. Each year, hundreds of my employees volunteer to staff the event. They’re joined by other volunteers from many of the organizations and businesses that work with us all year. Together, this meant nearly 500 people were … Continued

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Join me at our Open House

Crystal is the symbol of a 15th anniversary, and it is fitting that ALCOSAN is holding its 15th annual Open House as we embark on a vigorous project to make our rivers crystal clear for generations to come. I am looking forward to welcoming guests to ALCOSAN on Saturday, September 16, for a day of … Continued

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How we got here

The story of Allegheny County’s wastewater treatment challenge, like similar situations in many older American cities, started hundreds of years ago. Before the completion of ALCOSAN’s interceptor sewer system and treatment plant in 1959, raw sewage and industrial waste flowed directly into district waterways. The thinking at the time was that dilution was the solution. … Continued

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Here at the Allegheny County Sanitary Authority, we serve residential and industrial users in 83 municipalities, 24 hours a day, 365 days a year, making sure that the wastewater leaving your homes and businesses is cleaned before it is returned to the region’s waterways. We’ve done some research, and what we learned is that we … Continued

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