Actually, there’s a common water connection at ground floor and water pump running from ground floor electricity connection. I always pay for the applicable water and electricity bill from my own pocket, where as water is used by all floor occupants in equal manner. But, Despite several reminders, other floor occupants do not contribute even a single rupee towards electricity / water usage or maintenance. What should I do? What are the legal options available to me? There is no written agreement between us.

If that doesn’t work – do not pay any more bills and the the utility/owner will shut it off.

Then see what they do??