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Water is impaired or a declining water quality trend is evident, and a TMDL is needed.
Impairment is based on results of biological monitoring or a fish kill investigation where specific causes and/or sources of the impairment have not yet been identified.
Tentative biological impairments and old fish kill impairments.
Verified biological impairments and recent fish kill impairments.
Impairment is based on a presumptive designated use. A use attainability analysis (UAA) will be required to determine whether the presumptive use is, in fact, the appropriate designated use for the impaired waterbody.