Hydrologic Unit Code-12 Code

{
  "id": "MLC-T-ENV-013682",
  "term": "Hydrologic Unit Code-12 Code",
  "field": "Environment",
  "definition": "Code assigned by the US Geological Survey used to classify watersheds in the United States and the Caribbean. Code consists of twelve digits which correspond to six levels of classification Region (first-level, 2-digit HUC), Subregion (second-level, 4-digit HUC), Accounting unit (third-level, 6-digit HUC), Cataloguing unit (fourth-level, 8-digit HUC), Watershed (fifth-level, 10-digit HUC), and Subwatershed (sixth-level, 12-digit HUC). Search Considerations:The Loading Tool links facility discharges with hydrologic unit codes (HUC-12) using a WATERS web service. Searching on HUC-12 will produce results if the WATERS web service returns NPDES IDs that correspond to the specified HUC-12. 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.",
  "abbreviation": "HUC-12 Code",
  "subject": "Enforcement and compliance",
  "references": [
    "Glossary of Frequent Terms in the Loading Tool"
  ],
  "url": "https://mlchart.com/terminology/environment/hydrologic-unit-code-12-code/"
}