In this section, “reusable diverted water” means water that: Is generated by: Backwashing an on–site potable water treatment system; or Using an ice maker; Is collected for reuse instead of discharged to a residential on–site sewage disposal system; and Contains no constituents that are detrimental to public health or the environment. Subject to paragraph (2) of this subsection, a person may use reusable diverted water for beneficial purposes, including: Gardening; Composting; Lawn watering; and Irrigation. A person may use reusable diverted water only: On the site on which the reusable diverted water originates; and In accordance with any applicable State and local laws or regulations, including State and local plumbing codes.