Condo Association member has questions about divvying up water bill

I’m a condo owner in a New York Condo Association. Our condo is a three story building with 7 apartment blocks, 3 apartments in each block.

For many years, we’ve paid or water/sewage from our maintenance fees as a common charge. Recently, it has been discovered that the city DEP actually has water meters installed in each block – one meter per 3 apartments. Some condo owners have requested a change such that the owners in each 3 unit block be charged according to their meter, and the cost would then be distributed according to shares in the condo association. It is not technically feasible to install sub-meters in each condo unit.

Can such a change be made without a vote from the entire condo association? Should we get a meeting of all condo owners and change our Bylaws, or can this be done by a Board decision? Last, does this present any legal issues?