Sewer lines are an integral part of the plumbing system in your Columbia house. We generally do not pay much attention what happens in the sewer lines, not unless a problem crops up. Blockage within the sewer lines may lead to a clog, which in turn can lead to backing up of waste water from the drains in your house. This is both unhealthy and is a potential source of damage to the house. One of the most common reasons for clogging of sewer lines is tree roots. You need to understand what some of the early warning signs are and be prepared to respond accordingly. Backing up of water is the most common warning sign. If the problem becomes really serious you will have to opt for a rooter service.