Sec. 2. The commissioner shall classify all water treatment plants, wastewater treatment plants, and water distribution systems actually used or intended for use:
(1) with due regard to the:
(A) size;
(B) type;
(C) character of wastes or water to be treated; and
(D) other physical conditions affecting those plants and systems; and
(2) according to the:
(A) skill;
(B) knowledge; and
(C) experience;
that the operator in responsible charge must have to successfully supervise the operation of those facilities so as to protect the public health.