Aquifer Sector Area and (smaller, sub-region) Aquifer System Area boundaries, as determined/defined by the State Department of Land and Natural Resources, Commission on Water Resource Management to provide a consistent basis for managing ground water resources. Data updated June 2022. Aquifer sector and system area boundaries were adopted to provide a consistent method by which to reference and describe ground water resources and to assist in various water planning efforts. These boundaries are not meant to be interpreted as absolute hydrologic boundaries. For more information on aquifer area boundaries, aquifer descriptions, and sustainable yields, please refer to the Hawaii Water Plan, Water Resource Protection Plan Update, 2019. Note: The Hawaii State Department of Health maintains another GIS aquifer layer, which is more resource-oriented in nature, and which has different boundaries than the CWRM version, which is more administrative in nature. For additional information, please refer to complete metadata at https://files.hawaii.gov/dbedt/op/gis/data/aquifers_dlnr.pdf or contact Hawaii Statewide GIS Program, Office of Planning and Sustainable Development, State of Hawaii; PO Box 2359, Honolulu, Hi. 96804; (808) 587-2846; email: gis@hawaii.gov; Website: https://planning.hawaii.gov/gis.