I want to consult the residential property to shut down my water supply facilities privately. Is it right or wrong?

First of all, their behavior must be wrong. The water supply company signs a contract with it, and you can ask the water supply company to fulfill the contract.

As for your neighbor relationship with the downstairs residents, you can solve it through negotiation or litigation and distinguish the responsibilities.

The property has no right to do so in this process.

Of course, you should try your best to cooperate with the residents downstairs and find out the reason. First, don't hurt the neighborhood. Second, if the loss of the downstairs residents is really caused by you, then you should bear the responsibility.