(1) When any building or land is connected with a main the Municipality may, so far as is consistent with any agreement made under section 229, charge the owner, lessor or occupier, whichever is prescribed by rule, for all water consumed at the rate or rates so prescribed ;
(2) Provided that the Municipality shall deduct from the charge on account of water supplied in any month one-twelfth of the water-tax assessed on the building or land.