A water bill of $800... ahhh!!

[Vy Mai]

We just received a bill of $800 for sewage and water... It's usually just $200 or less. I called the city and they said the meter is fine. I had a plumber come take a look at it and he said nothing is leaking. The city is sending someone over to look at the meter to make sure for $75. Has anyone experienced this problem before? Any advice? I really don't think our tenants can use that much.