(a) In this section, "graywater" has the meaning provided by Section 341.039, Health and Safety Code.
(b) The commission by rule shall adopt and implement minimum standards for the use of graywater for:
(1) irrigation and other agricultural purposes;
(2) domestic use, to the extent consistent with Section 341.039, Health and Safety Code;
(3) commercial purposes; and
(4) industrial purposes.
(b-1) The standards adopted by the commission under Subsection (b)(2) must allow the use of graywater for toilet and urinal flushing.
(c) The standards adopted by the commission under Subsection (b) must assure that the use of graywater is not a nuisance and does not damage the quality of surface water and groundwater in this state.