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Allegheny County
Sanitary Authority

ALCOSAN- Alleghenny County Sanitary Authority

ALCOSAN

  • Who We Are
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  • What We Do
    • Wastewater Treatment
    • System Operations & Maintenance
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  • Clean Water Plan
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    • Plant Expansion
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On Pittsburghs far North Side, tucked under the McKees Rocks Bridge, there is an agency that nearly 1,000,000 people rely on every day.

This is the Allegheny County Sanitary Authority ALCOSAN. The Clean Water Agency for most of Allegheny County.

Everyday ALCOSAN recycles up to 250 million gallons
of mixed stormwater, groundwater and sewage, cleaning it up and returning it to the Ohio River, cleaner than the river itself is, and we've been doing that since 1959.

Over the years we have upgraded and updated, investing millions of protecting our neighbors as well as our rivers and creating jobs. Above all, our workers have one mission. Which they carry out 24 hours a day, seven days a week to make our Three Rivers cleaner.

Now we stand on the brink of a new day for our region, working with our 83
municipal partners and their customers, we are creating a better system. We are working together as a region. We are investing in making the system more efficient throughout the region, and we are committed to having the world class clean rivers that our city and region deserve. Together we can make that goal a reality.

ALCOSAN

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Welcome to ALCOSAN

Located along the Ohio River on Pittsburgh’s Northside, the Allegheny County Sanitary Authority (ALCOSAN) provides wastewater treatment services to 83 communities including the City of Pittsburgh.

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Find Us

3300 Preble Avenue
Pittsburgh, PA 15233

(412) 766-4810

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Upcoming Events

  • May 26
  • Penn Hills Memorial Day Parade
  • 11:30 AM
  • Duff Road|Penn Hills
  • Jun 12
  • Professional Services Committee
  • 2:00 PM
  • ALCOSAN
  • Jun 16
  • ALCOSAN Summer Science Camp 2025 – Grades 4–5
  • 8:00 PM
  • ALCOSAN

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