Which of the following can affect a home's water supply quality?

The age of the plumbing system is a significant factor that can impact a home's water supply quality. Older plumbing systems may contain materials that can leach into the water supply, such as lead from old pipes or solder. As pipes age, they can also corrode or accumulate deposits, which can lead to reduced water quality, unpleasant tastes, or odors. Additionally, aging plumbing can increase the likelihood of leaks, which may introduce contaminants from the surrounding environment. Therefore, assessing the age and condition of a plumbing system is crucial for understanding the potential risks to water quality in a home.

In contrast, while other factors like the type of heating system and the material of home flooring may have indirect effects on the overall environment, they do not directly influence the water supply quality. The exterior color of a home is primarily an aesthetic consideration and has no bearing on the characteristics of the water supply.