Enforcing payment of maintenance dues in an apartment

It will invite criminal action. Use simple tactics publicise the names of defaulters to all others.

Inform them that if defaulster do not pay up water connection of whole buidling will be cut of.

Go on issuing notices with copy to all.

Unltimately put a big hoarding at entrance showing names of defaulters. It will work.

As JSDN says it can invite criminal action if water supply is cut.

In fact if you have not registered your association, you will have no locus standii to collect maintenence charges. Under which Act in Karnataka are you going to register your Association? In Maharashtra there are at least three options viz the Co-operative Societies Act, the Societies Registration Act or with the Registrar of Assuarances. In Maharashtra there is law for recovery under the Co-operative Societies Act. The other two options are weak.