Water bill is 17% of operating Income

[Abad Marroquin]

I am analyzing an 12 unit apartment where the owner pays water and noticed that the water bill represents 17% of the total operating income. I don't own any apartment, so I don't know if this is within the norm. I also wonder how much would it be to sub-meter the water. I understand it varies from city to city. Has anyone done it on a similar property and how much did it cost. This property is a 2 story building 2 bd, 1ba built in late 1970's.