Water bill unpaid by tenants

[Marc Dufour]

My tenants left the property at the end of the lease. 10 days later I received on the door a overdue notice at the name of the tenant but my address that they didn't pay for their water and that it is $300. I already sent the security deposit back. - Am I the one liable for the bill? - Should I cancel the security deposit and take the money for the water to pay it directly? - Can the water put a lien on my property even though the water account was at their name?