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The threshold limits on pollutants in surface waters \u2014 Florida's surface water quality standards on which TMDLs are based \u2014are set forth primarily in rules 62-302 and 62-303, Florida Administrative Code (FAC), and the associated table of water quality criteria. Adopted TMDL rules are included in Chapter 62-304, FAC. The data layer depicts the hydrologic basins where the State of Florida has proposed future development of TMDLs through 2022. These basins are based on the Hydrologic Unit Code (HUC) watersheds that are delineated by USGS using a nationwide system based on surface hydrologic features. This system divides the country into 21 regions (2-digit), 222 subregions (4-digit), 370 basins (6-digit), 2,270 subbasins (8-digit), approximately 20,000 watersheds (10-digit), and approximately 100,000 subwatersheds (12-digit). 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