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  2. Great Lakes AOCs

List of Great Lakes AOCs

Map of U.S. Great Lakes Areas of Concern

GLRI MAP 2026

This table lists Great Lakes Areas of Concern (AOCs). AOCs are delisted after monitoring shows all beneficial use impairment targets have been met. The map shows AOCs, delisted AOCs, and AOCs closest to delisting. For questions about a specific AOC, contact (GLRI-AOC-Program@epa.gov) and your message will be forwarded to the appropriate contact. 

Remediation and Restoration Project Table 

Area of Concern

State

Lake

Ashtabula River  OhioErie
Black RiverOhioErie
Buffalo RiverNew YorkErie
Clinton RiverMichiganSt. Clair, Erie
Cuyahoga RiverOhioErie
Deer LakeMichiganSuperior
Detroit RiverMichiganErie
Eighteenmile CreekNew YorkAmerica
Lower Green Bay & Fox RiverWisconsinMichigan
Grand Calumet RiverIndianaMichigan
Kalamazoo RiverMichiganMichigan
Lower Menominee RiverMichigan/WisconsinMichigan
Manistique RiverMichiganMichigan
Maumee AOCOhioErie
Milwaukee EstuaryWisconsinMichigan
Muskegon LakeMichiganMichigan
Niagara RiverNew YorkErie, America
Oswego River New YorkAmerica
Presque Isle Bay PennsylvaniaErie
River RaisinMichiganErie
Rochester EmbaymentNew YorkAmerica
Rouge RiverMichiganErie
Saginaw River and BayMichiganHuron
Sheboygan RiverWisconsinMichigan
St. Clair RiverMichiganHuron, St. Clair, Erie
St. Lawrence River at Massena/ AkwesasneNew YorkSt. Lawrence River, America
St. Louis RiverMinnesota/
Wisconsin
Superior
St. Marys RiverMichiganHuron, Superior
Torch LakeMichiganSuperior
Waukegan HarborIllinoisMichigan
White Lake MichiganMichigan

Great Lakes AOCs

  • The Great Lakes
  • Great Lakes AOCs Home
  • AOC List, Map and Contacts
  • Beneficial Use Impairments
  • Remedial Action Plans
  • Great Lakes Legacy Act
Contact Us About Great Lakes AOCs
Contact Us About Great Lakes AOCs to ask a question, provide feedback, or report a problem.
Last updated on September 28, 2026
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