It is surprising how much "old mercury" private residents bring in. It is brought to the Household Hazardous Waste Center in pill vials, baby food jars, mayonnaise jars and a multitude of other containers. First, DO NOT handle liquid mercury. Keep it in a leak proof container and place the container in two zip-lock bags. Residents of Seminole County can dispose of mercury at the Seminole County Household Hazardous Waste Center.