Must each tenant be given their own water bill or meter usage?

Question Details:

We are living in an apartment complex and our water bill is unusually high. When we asked around we found out that they don't have individual meters for each apartment, instead they have 1 meter for 10 apartments and split it between the tenants. Most tenants have a laundry machine and use a considerable about of water. We do not use much water and are paying 3 times what we use to pay when we had a house. Is this legal? Can they charge us without presenting a meter usage for our apartment? Important Notice