If water is used to achieve energy efficiency in new Federal buildings in accordance with 42 U.S.C. § 6834(a)(3), then water conservation measures shall be applied to the extent that they are life cycle cost-effective.
(3)
(A) Not later than 1 year after August 8, 2005, the Secretary shall establish, by rule, revised Federal building energy efficiency performance standards that require that—
. . .
(ii) if water is used to achieve energy efficiency, water conservation technologies shall be applied to the extent that the technologies are life cycle cost-effective; and
(vii) In addition to any use of water conservation technologies otherwise required by this section, water conservation technologies shall be applied to the extent that the technologies are life cycle cost-effective.