Tree roots are one of the leading causes of sewer line damage in NYC. Roots are naturally attracted to the moisture and nutrients inside sewer pipes, and they can enter through tiny cracks or joints. Once inside, roots grow rapidly, causing blockages, pipe cracks, and eventually complete pipe failure. NYC street trees are particularly problematic because they are planted close to underground utilities. Prevention methods include root barriers, regular sewer cleaning, and choosing slow-growing tree species. If roots have already damaged your sewer line, options range from mechanical root cutting to pipe lining to full replacement.