The following communities are served by ALCOSAN:
*Only a portion of the municipality is served by ALCOSAN

Aspinwall
Avalon
Baldwin Borough*
Baldwin Township
Bellevue
Ben Avon
Ben Avon Heights
Bethel Park*
Blawnox
Braddock
Braddock Hills
Brentwood
Bridgeville
Carnegie
Castle Shannon
Chalfant
Churchill
Collier*
Crafton
Dormont
East McKeesport*
East Pittsburgh
Edgewood
Emsworth
Etna
Forest Hills
Fox Chapel*
Franklin Park*
Green Tree
Heidelberg
Homestead
Indiana*
Ingram
Kennedy
Kilbuck
McCandless*
McDonald
McKees Rocks
Millvale
Monroeville
Mt. Lebanon
Mount Oliver
Munhall
Neville
North Braddock
North Fayette*
North Huntingdon*
North Versailles
O’Hara, Oakdale
Ohio*
Penn Hills
Penn Township
Peters
Pitcairn
Pittsburgh
Pleasant Hills
Plum
Rankin
Reserve
Robinson
Ross
Rosslyn Farms
Scott
Shaler
Sharpsburg
South Fayette
Stowe
Swissvale
Thornburg
Traord
Turtle Creek
Upper St. Clair
Verona
Wall
West Homestead
West Miin
West View
Whitaker
Whitehall
Wilkins
Wilkinsburg
Wilmerding