I know a couple who recently got a $1600 water bill for one of the properties they own. Here in Milwaukee the water is cheap enough that land lords often just include it in the rent.
Due to sewage and lead pipe replacement charges it's gone from maybe $25 a month (many years ago) to $60 and is billed quarterly. My last bill was $175.
When one of the owners investigated it seemed the tenant had a leaking toilet and never bother to inform the land lord! Still the $1600 bill seemed very high. I guess the toilet was running pretty fast but ...wow.
Hopefully they kicked the tenant out and and did not refund the security deposit...but is there any recourse for them?
My guess is "no" but had the utility billed once a month like all companies do...the problem would have been caught a lot sooner.