The average flow rate of faucets is between 1.0 GPM and 2.2 GPM. In the US, the maximum flow rate for the kitchen and bathroom faucets is 2.2 GPM at 60 PSI. However, in more environmentally regulated areas, the maximum flow rates are further restricted.
Many bathroom faucets have a much lower water flow rate than kitchen faucets. A bathroom faucet can run at 0.8 GPM to 1.5 GPM without a noticeable reduction in water pressure. However, a shower head and handheld require a GPM ranging from 0.8 to 2.5. This ensures that there is a consistent flow of water in both your shower head and handheld.