IDWR’s Director is granted the authority to designate Critical Groundwater Areas (CGWAs) and Groundwater Management Areas (GWMAs) under Idaho Code Title 42, Chapter 233a and 233b, respectively. These sections codify the definitions and bases for designating these special management areas.
The authority for designating areas for regulating groundwater withdrawals from aquifers subject to insufficient supplies was first granted in 1953 through amendments to Idaho’s Groundwater Act. However, it was not until 1962 that the first CGWAs were designated in the Oakley Fan area. Amendments to the Act in 1982 granted authority for designating GWMAs. The Grandview-Bruneau area, designated in 1982, was the first GWMA.
The Order designating the Southeast Boise GWMA in 1994 was the first time an advisory committee was required as a part of the initial formation of a GWMA. Since that time, orders requiring the formation of advisory committees have been issued subsequent to the initial formation of the management areas. These committees are to assist in the management of groundwater resources through development of management plans, to establish processes for dispute resolution, and to act as a forum for discussion and communication.