Michigan Dept. of Environment, Great Lakes, and EnergyThe watersheds indicate approximate areas used for determination of the waste load (point sources) and load allocation (nonpoint sources) of each TMDL. Data are compiled by the State of Michigan Department of Environment, Great Lakes, and Energy (EGLE), Water Resources Division. At a minimum, this dataset is updated every two years after the approval of Michigan's Integrated Report (303d List). Features include a hyperlink to the applicable TMDL document, and the year of USEPA approval. Please direct questions to Molly Rippke, RippkeM@Michigan.gov . Version: November, 2020. Field Name Field Description TotalMaxiumumDailyLoadName Official name of Total Maximum Daily Load (TMDL) TMDLCategory Category of parameter being addressed by the TMDL Year Year the TMDL was issued and approved by EPA TMDLDocument Official TMDL Documentation TMDLID Official TMDL Identifier ImpairedDesignatedUse1 Primary designated use that is impaired and being addressed by the TMDL ImpairedDesignatedUse2 Additional designated use that is impaired and being addressed by the TMDL CauseOfImpairment1 Parameter causing the primary designated use impairment CauseOfImpairment2 Parameter causing the additional designated use impairment EPAID Official EPA TMDL Identifier UniqueID Unique identifier used to differentiate TMDLs within the same category Status EPA approval status of TMDLArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/081e782d44974cb597e24292985e6ebd_1engState of Michigan Open Data PortalPublicDissolved Oxygen (D.O.) Total Maximum Daily Loads (TMDLs) Watersheds [Michigan]Web servicesMichiganLast Modified: 2025-09-24