(a) Commissioners are elected by position as follows:
(1) the commissioner elected for Position 1 is at large and must reside in the district;
(2) the commissioners elected for Positions 2 and 3 must reside in Navigation Precinct No. 1;
(3) the commissioner elected for Position 4 must reside in Navigation Precinct No. 2;
(4) the commissioner elected for Position 5 must reside in Navigation Precinct No. 3; and
(5) the commissioner elected for Position 6 must reside in Navigation Precinct No. 4.
(b) Each commissioner must be a qualified voter of the district.