Plumbing is maintaining, modifying piping, installing, appurtenances, and appliances connected with sanitary or venting systems, public or private water supply, and storm drainage systems. Plumbing does not include drilling water wells, installing water softening equipment, or producing or selling plumbing fixtures, equipment, devices, or appliances. A plumbing system consists of a sufficient supply of potable water, an acceptable and secure sewerage system, and types of equipment & fixtures. One of the common problems in Plumbing is related to cross-contamination, which occurs when wastewater and pure water pipes intersect, which is one of the most severe consequences of faulty Plumbing. This often happens when there is a sewage backup in your pipes.