Sewer lines can become compromised a different few ways. Some of these ways are even preventable. The first way a line can start backing up is by clogging, in other words “user error”. Clogging can happen when flushing items down the toilet that are not meant to be flushed town the toilet, like excessive amounts of toilet paper, bulky paper towels, or sanitary napkins at best will cause a clogged drain. Over time these clogs can accumulate. However plumbers have been known to find even stranger items in sewer lines like small toys, hand towels, and even false teeth! Other blockages can come from sinks, particularly the kitchen sink. Greasy oily substances should not be disposed of down a sink drain. These substances can solidify along their travels down the sewer pipes and build up over time in your sewer system, eventually creating a blockage. External forces can also cause line damage. External line damage can be caused by growing tree roots, shifting soil, or even heavy equipment above the sewer line has been known to cause disruption or damage.