Water & sewer bill increasing every month, what to do?
Bought my first rental in Feb this year, 4bd, 2ba. There is a family of 6 in there, so I expected the water & sewer bill to be high. I pay the bill since it is my name, which i believe is required in Ma. The tenant is good for the most part, but there are a few things that make me suspicious that there are either more people living there than listed on the lease, or possibly lots of different people staying over from time to time. I wouldn't really mind about the extra people since the place is kept clean and no real issues. Problem is, the water & sewer bill has been increasing and is now up to $155 this month. I am not sure what to do about it since I can't prove there are others living there.
Any suggestions? The lease isn't up until next May, I was thinking about adding something at that point about the tenant covering over a certain amount, not sure if I can legally do this though. What can I do in the meantime?