HUC Region

{
  "id": "MLC-T-ENV-013513",
  "term": "HUC Region",
  "field": "Environment",
  "definition": "1. A hierarchical, numeric code that uniquely identifies hydrologic units. The first two digits identify the region, the first four digits identify subregions, the first six digits identify accounting units, and the full eight digits identify subbasins. From the above example (definition of a hydrologic unit), the hydrologic unit codes are: 02 - the region (Mid-Atlantic) 0206 - the subregion (Upper Chesapeake) 020600 - the accounting unit (Upper Chesapeake. Delaware, Maryland, Virginia, and Pennsylvania) 02060002 - the subbasin (Chester-Sassafras. Delaware, Maryland, Pennsylvania) Zeroes in the two-digit accounting unit field indicate that the accounting unit and the subregion are the same. Zeroes in the two-digit subbasin field indicate that the subbasin and the accounting unit are the same.\n\n2. HUCs are a way of identifying watersheds in the United States and are organized from largest to smallest.\n\n3. The first level of classification for watersheds and is represented by a 2-digit HUC. The United States and the Caribbean are divided into 21 regions. (See HUC-12 Code). Search Considerations:The Loading Tool links facility discharges with hydrologic unit codes (HUC-12) using a WATERS web service. Searching on HUC Region will produce results if the WATERS web service returns NPDES IDs that correspond to the HUC-12’s for the specified HUC Region. For more information see Overview of Watershed Data. (https://echo.epa.gov/trends/loading-tool/resources/about-the-data#watershed). These data are from WATERS.",
  "subject": "Enforcement and compliance",
  "references": [
    "EPA Guidelines to Assessing Regional Vulnerabilities at http://www.epa.gov/reva/docs/guidelines_reva_20080627.pdf",
    "How's My Waterway Glossary",
    "Glossary of Frequent Terms in the Loading Tool"
  ],
  "url": "https://mlchart.com/terminology/environment/huc-region/"
}