Section 256(2) in The Calcutta Municipal Corporation Act, 1980
(2)Every stopcock fitted on a service main after the commencement of this Act shall be placed in such position as the Municipal Commissioner deems most convenient :Provided that -(a)a stopcock in private premises shall be placed as near to the street from which the supply pipe enters those premises as is reasonably practicable; and(b)a stopcock in a street shall be placed as near to the boundary thereof as is reasonably practicable.