The Ruling on Grease in the Hands and Utensils

Question: Is it permissible for the owner of a house or building to have a single drain for his house, to which all wastewater goes, including the water from washing food utensils and washing hands after finishing eating?

Answer: There is no harm in having a drain for washing utensils and hands of food, along with other waste; because the grease in the hands and utensils is not food.
As for bread, meat, and types of food, it is not permissible to throw them into drains. Rather, it is obligatory to give them to those who need them, or to place them in a prominent place that is not disrespected, hoping that someone who needs them for their animals will take them, or that some animals or birds will eat them. It is not permissible to place them in the garbage, nor in dirty places, nor on the road, due to the disrespect involved in doing so, and due to the disrespect and harm caused to those who walk on the road by placing them there.