It is important to limit what kinds of things you allow to go down your drain in either the home or a business. Sewer lines and treatment systems are not designed to handle certain wastes. Things that can cause problems include flammables, corrosives, toxins, excessive or incompatible solids, oil, grease, and others. In many cases, the greatest risk occurs at the point of discharge – the service line through the building and out to the sewer main in the street or alley. This line belongs to the building, not the Town, so damage or clogs in it are the responsibility of the owner.