(a) A person may not sell, donate, or transfer a water closet plumbing fixture or other equipment that uses water if the fixture or equipment:
(1) does not comply with a state-approved plumbing code; and
(2) may permit the backflow of a nonpotable substance into a potable water supply.
(b) The board shall adopt rules under this section that include a list describing the types of plumbing to which this section applies.