I do not have a very commanding presence, and while I talk sternly to tenants if required, I feel like I have no leverage in this situation because the tenants will keep ignoring me unless I "do" something, not just talk.Making matters worse is the fact that they are dirt poor, and my sympathy meter kicks in.  

But I had some issues with the water bill due to a broken water meter.

I am also in the process of getting a house meter installed since the common areas are hooked up to their panel.

We could buy a city sticker that allowed us to park only in certain parking spots that were interspersed with metered spots.  

@Katherine Rossell the only really proper way to sub-meter heat is to install separate smaller heating units unique to each unit.  

You bet @David Zheng, even crazier when they rip the meter box off of the building.

I don't see - apart from metered utilities that you pay - why a 2nd person warrants higher rent, apart from maybe slightly higher wear and tear as there are now 2 people instead of only one.

I have a similar problem ,  tenant was stealing electricty , they swapped out the smart meter , for a regular meter . ( idiots didnt realize the smart meter sends info back in real time )   So I now have a new tenant ready to sign the lease , but BGE wants to see the lease , BEFORE they turn on the electric . 

Is it possible ( Do units have separate water meters?)

At least this girl has a sister who wants her and is trying to make that happen.Regarding the water meter, we looked into that at last turnover, her house, pipes, plumbing would not easily allow for installation of such, though it is legal in MA, it is pricey - her plumber told her it was not a workable solution.