<human>: We lived with the guy for 6 months and always gave him checks for the water bill, which he was in charge of. He moved out in June. Today we get a call from Seattle Public Utilities saying he hasn't paid since March and the amount he paid was only part of a single bill. His account is still linked to our house and they claim we owe them $570 dollars or they will shut off our water. The city doesn't chase down delinquents and they refuse to help us in any way; they say it's only between us and our landlord, and he is also unwilling to help. Our old roommate, surprise surprise, is not answering is phone. What can we do?

Can you summarize the given text in a few sentences?
<bot>: Ex-roommate moved out, didn't pay the bills we gave him money for. City is shutting off our water because of it.