Crazy Water Bill

I moved to a new apartment in Hoover a few months ago and my water bill has been super inconsistent. My apartment includes 3 people and we each regularly go out of town, etc., so i feel like it’s not even plausible that we go crazy with the water. Anyway, past few months our water bill has been between $300-$400 which is absolutely insane, right? I haven’t seen any visible leaks and have no idea what it could be from. Management has e-mailed us about the bill being high, but hasn’t done anything to fix it or inspect. Any advice would be appreciated :(