As a service plumber, one of the most common plumbing problems that I have been asked to diagnose is low “water pressure”. The reason that I put “water pressure” in quotes is because what a customer thinks is low water pressure is quite often actually low flow. There is a difference, and that difference is very important when trying to figure out the best remedy for the problem.

So what’s the difference? Pressure is the amount of force behind the water, pushing it through your pipes. It is measured in pounds per square inch (psi). Flow is the amount of water that “flows” out of an open outlet, like an open hose bib or faucet. Flow is usually measured (in the US) in gallons per minute (gpm). The symptoms for low pressure and low flow can sometimes look similar, but it is usually pretty easy to diagnose.

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