How to Check Your Flow Rate – Private Water Supply:

  • Check the flow rate after the well pressure tank at one of your fastest flowing faucets.
  • Sometimes, there is a faucet installed right after the pressure tank. Or, you can open the hot and cold water faucets at a bathtub, full open, and let it run until the well pump kicks on.

Public Water Supply:

  • Check the flow rate at the fastest flowing faucet in the home, such as at a bathtub.
  • You should open the hot and cold water faucets, full open. Then, put a 5 gallon bucket under the faucet and time it to see how many seconds it takes to fill the bucket to the top.

60 seconds = 5 GPM
45 seconds = 7.5 GPM
30 seconds = 10 GPM