You can’t get turkeys to vote for Christmas.
Pass a by-law that commercial properties need to be responsible for their own water usage (if you can get the 75 percent of the vote). If you can’t, go to NCAT and ask for orders along those lines.
Building managers who were absolutely ruthless might shut off the water to the salon for essential maintenance at peak times due to concerns that there must be a leak. Not that I am recommending that. But it would get their attention.