It may be necessary to repair or replace a sewer line if there is significant damage or blockages caused by factors such as: Heavy accumulation of grease, debris, and other materials Root infiltration, which can cause cracks and breaks in the line Age and wear-and-tear of the line Shifting or settling of the ground around the line Natural disasters or other external factors that cause damage to the line It is recommended to inspect the sewer line three to four times a year by professional plumbers or sewer experts, who can use CCTV cameras to check the line’s condition and determine if any repairs or replacements are necessary.