TMDL Allocation Areas

The Minnesota Pollution Control Agency (MPCA) has developed a statewide TMDL (Total Maximum Daily Load) Database to standardize and maintain spatial data related to TMDL reports. This project stores geographic boundaries of TMDL allocation areas, maintains data attributes for integration with the TEMPO system, and is updated as new TMDL reports receive EPA approval. The database contains four primary feature layers: TMDL Project Areas, Allocation Areas (specific drainage areas where pollutant sources were assessed), and individual Streams and Lakes with approved TMDL reports. The dataset supports spatial analyses with various environmental data layers, including feedlots, surface water discharge points, riparian areas, and green infrastructure.<br/><br/>Allocation areas, including boundary conditions, were delineated using the best available data source, however errors may remain. The 'Source' field specifies the dataset from which the allocation area was derived. Entries marked as 'Project' have been checked against the approved TMDL report. Other entries denote the allocation areas data source. Please carefully review this metadata and consult with the data owner or appropriate liaison with questions.