Which part of the plumbing system is most likely to develop leaks?

The joints and connections in a plumbing system are typically the most likely areas to develop leaks. This is largely due to the fact that these points are where different pieces of piping and fixtures meet, and they are often under stress from water pressure, movement, and thermal expansion. Over time, sealing materials such as joints and gaskets can deteriorate, leading to potential leaks. Moreover, installation errors or improper fitting can increase the likelihood of leaks occurring at these connections.

While pipes themselves can also be prone to damage and leaks from corrosion or physical impact, the joints are particularly vulnerable due to the complexities involved in sealing different materials and ensuring pressure integrity. Fixtures in the bathroom can leak as well, but these incidents are often the result of issues at connections. The drainage system can have leaks, but it's typically the joints and connections throughout the system that are the first points to show signs of a problem.