At which point in a dwelling is it best to observe water pressure at fixtures?

Observing water pressure at the highest point in a dwelling is advisable because it offers the most accurate representation of the pressure available throughout the entire plumbing system. Water pressure tends to decrease as it travels through pipes, especially if there are bends or extended runs that can cause friction loss. By measuring at the highest point, you can assess how well the system delivers pressure to that location, which may indicate whether there are potential issues affecting pressure elsewhere in the dwelling. This information is crucial for determining if the water pressure is adequate for fixtures located lower in the building, where demand can be higher, and can help identify any deficiencies in the plumbing system that may need to be addressed.