The Great Lakes Water Quality Agreement list 14 beneficial uses that may be impaired and in need of restoration. The four general categories below contain the 14 impairments identified by number based upon the sequence in which they appear in the agreement. The numbers identify specific use-impairment categories used in the Great Lakes Water Quality Agreement.
Question marks indicate impairments being investigated.
Its use and reference is unlimited, upon condition that the source is correctly attributed. The Great Lakes Atlas is also available on line .