Make tenants pay for water?

[Stephen Neto]

I am acquiring my first 3 family.  I hate the fact that I have to pay for something the tenants use such as water.  Currently landlord pays water.  After signing and when property is mine, is it reasonable to require the tenants to pay for the water even though all this time they didn't have to pay for it?  

If so I can get an average water expense amount and divide it in 3 and include that figure in the rent.  Does that make sense and sound reasonable?