(a) The Commissioner of Consumer Protection, in consultation with the State Building Inspector and the Commissioners of Public Health and Energy and Environmental Protection, shall establish procedures for testing the efficiency of plumbing fixtures offered for retail sale if such procedures are not established in the State Building Code adopted pursuant to § 29-252.

(b) Each manufacturer of plumbing fixtures shall test samples of such plumbing fixtures in accordance with the procedures established pursuant to this section or those established in the State Building Code, whichever are applicable. The tested flow rate shall be conspicuously marked on the unit carton in which the plumbing fixture is offered for retail sale.