Share 'Chocolate going down the drain'

Question about potential for drainage problems: I have been in business for three years this coming October. I moved my location recently, and when I went back to the old Mall, someone told me that the drains had backed up, and they blamed me. The City inspectors did not require a grease trap, and so of course I didn't spend the money on one. Should I have? Or should I be putting some sort of dra…