The highest GPM (gallons per minute) you are likely to see on a kitchen faucet for home use is 2.2. This is more than enough for most kitchen tasks and the majority of faucets are lower than this. An aerator makes a faucet’s effective power greater. In some states, 2.2 is above the permitted limit, so you should check your local rules before buying the highest GPM faucet you can find.