Idaho Code § 42-3211b
Subsequent to the creation of a water and/or sewer district and the election of the first board of directors, the water and/or sewer district board of directors may elect, by resolution, to divide the district into five (5) director zones, as nearly equal in area and parcels to be served as practicable, to be known as zones one, two, three, four and five. If the board of directors elects to create director zones, then it shall also, prior to the next district election, adopt a director election transition schedule for each zone, in accordance with the terms of office of the existing directors, which provides that at the end of the last then-currently serving director term, there will not be more than one (1) director per director zone.
Idaho Code § 42-3211b