Excessive water usage

[James Erickson]

I recently started managing a duplex with a single man living in one side and 2 women living in the other side. The water bill last month was $270 and this month it is $353. I'm looking for ideas on how to handle this situation. The yard to the duplex is very large, especially the backyard and the grass is as green as can be. I don't want to make the tenants angry but those water bill are outrageous! Thanks.