2 water meters, 1 bill???

[Jonathan Perez]

So clearly the duplex I just bought has 2 water meters. But when I called the water company, the lady that answered was talking about one bill for the whole building. I thought it was going to be 2 separate water bills for each water meter and of course both be under two different people. Does anyone know why she's telling me this? Is there something I may be missing? What questions should I be asking?