It is better to get installed the water meters in the separate flats. Water is a need of every body and should be assessed equally with in a group housing society. Every body has right to get water through the common pool of the society.
Charging different water charges from 2 BHK and 3 BHK houses at the flat rate is also a matter of concern whereas it should be directly controlled by the consumption of water as in many flats single person only live and on the other hand in other flat more than six members stay. In that way it is not a good that you charge as to the type of the holings but to percapita basis.
Advise; always take assistance from an experienced and well educated Advocate of the field.
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With Regards !!
Anand Bali, Adv.
(B.Com., M.A., LL.B., M.B.A.)
Supreme Court Of India