Generally any liquid waste generated from business, trade or manufacturing processes, other than domestic sewage, is defined as trade waste. Untreated trade waste that contains prohibited substances such as flammable liquids, grease, acids and solids may block the sewerage system, damage components, adversely affect the treatment process and increase costs to the community. Household waste, such as toilet waste and water from bathrooms, kitchens and laundries is referred to as domestic sewage and should not be confused with trade waste.