Old piping corrodes the drain lines and causes sewage backups and a lot of problems. Piping problems in older high-rise buildings are known to cause flooding from the subject unit throughout many floors down.
The dirty water contaminates everything from drywall to carpets, furniture, and personal possessions. In older buildings, the water causes additional damage to ceilings and walls made of asbestos-containing material found in drywall and “popcorn” ceilings.
When drywall gets wet there is the possibility of mold growth. The one water leak problem becomes compounded into invasive environmental issues unless addressed immediately.