(1)  A regulated entity may restrict the supply of water by any or all of the following means:

(a) by restricting the purposes for which the water may be used;

(b) by specifying the purposes for which the water may not be used;

(c) by restricting the days or times, or both, when the water may be used;

(d) by restricting the quantity of the water that may be used by a person, or at premises, in a specified period;

(e) by restricting the means or methods by which the water may be used.

(2)  A regulated entity may apply a restriction of the supply of water to all, or part only, of the area to which the regulated entity ordinarily supplies the water.

(3)  A regulated entity may exempt classes of persons, in whole or in part, from a restriction of the supply of water.