Sec. 4. As used in this chapter, "water utility" means:
(1) a public utility (as defined in IC 8-1-2-1(a));
(2) a municipally owned utility (as defined in IC 8-1-2-1(h));
(3) a not-for-profit utility (as defined in IC 8-1-2-125(a));
(4) a cooperatively owned corporation;
(5) a conservancy district established under IC 14-33; or
(6) a regional water district established under IC 13-26;
that provides water service to the public.