Good evening. Unless there is something in writing that indicated you were responsible for sewer payments, then, NO, the landlord cannot now decide that the tenant is responsible for past sewer payments.
I hope this has given you the guidance you were seeking. I wish you the best of luck!
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The information given here is not legal advice. As all states have different intricacies in their laws, the information given is general only. This communication does not establish an attorney-client relationship with you. I hope this answer has been helpful to you.