Payment of water usage charges when used by joint users or licensees.

Where the supply of water is used by joint owners, occupiers or beneficiaries of a premises or a unit, the water usage charges shall be payable by such owners, occupiers or beneficiaries, in proportion to the use of such water by each individual owner, occupier or beneficiaries to be determined by the assessing authority at the time of making assessment whose assessment in this behalf shall be final.