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Good afternoon,I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
Email is not yet recognized as legal notice for many purposes, and so the fact that the water bill was not transferred out of your name doesn't surprise me. And while technically, you do owe the bill, the new owner of your old house technically owes you the money if you have to pay the bill, so you will want to contact them to pay the bill and if they will not do so, then pay it yourself and sue them in small claims court to recover the charges that they should be paying in the first place---but for the billing irregularity.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.Kindly, remember to rate my service to you. That is how I am credited for assisting you.I wish you and yours the best this holiday season,Doug