5 people in a 1B unit?

hi guys, i live on the ground floor of a small apartment complex. directly above me is an indian family, 2 parents, 2 grandparents & a child living in a 1 bedroom.

i mind my business (i don’t care) although water rates are shared / divided evenly between the units - meaning i’m a single owner and they’re using 5x the amount of water. my bills are huge.

anything i can / should do?