What should my home water pressure be?

The ideal home water pressure is about 60 psi, within an acceptable range of 40 to 80 psi. That single number balances strong flow at the tap against the strain that high pressure puts on your plumbing.

Several federal and code authorities land on the same range. The EPA WaterSense program recommends that homes keep service water pressure at a 60 psi maximum and notes that fixtures operate best between 45 and 60 psi. The Department of Energy's PNNL Building America Solution Center also recommends a 60 psi maximum, warning that higher pressure can rupture pipes and damage fixtures. The plumbing code sets the hard ceiling: under the International Plumbing Code (IPC) Section 604.8, static pressure may not exceed 80 psi.

Here is a quick reference for where common readings fall:

Pressure that drifts to the edges of this range is not always an emergency, but it is a signal worth checking. A reading of 85 psi today can climb higher as municipal supply pressure swings through the day and night.

It also helps to know what the code expects on the low end. The IPC sets minimum design pressures so fixtures actually work: a fixture with a flush tank needs at least 8 psi flowing, a flushometer valve needs at least 15 psi, and a blowout fixture needs at least 25 psi. Those are floors for individual fixtures, not the whole-house target. The practical comfort range most homeowners want still centers on that 40 to 80 psi window, with 60 psi as the number to aim for when you set a regulator.

High water pressure is a problem because it forces your entire plumbing system to work under constant strain, which shortens the life of pipes, joints, and appliances. The higher the pressure, the harder water pushes against every fitting in the house.

The damage shows up in several ways:

• Pinhole leaks. Sustained high pressure accelerates pitting and stress on copper lines, one of the contributors to the small spray leaks that plague older copper systems.
• Water heater and appliance wear. Dishwashers, washing machines, and water heaters are built for a pressure range. Run them above it and valves, hoses, and seals fail sooner.
• Water hammer. When a quick-closing valve slams shut against high-pressure flow, the pipes bang. IPC Section 604.9 requires a water-hammer arrestor at quick-closing valves for this reason. Left alone, the repeated shock loosens joints.
• Burst supply hoses. The braided hoses behind a washing machine or under a sink are a common failure point, and high pressure makes a sudden burst far more likely.
• Wasted water. More pressure means more water flows through every open tap and every running toilet, raising your bill for no benefit.

Because the IPC fixes the ceiling at 80 psi, any reading above that is both a code issue and a maintenance risk. The code requires a pressure-reducing valve (PRV) wherever static pressure exceeds 80 psi, and that valve must reduce the pressure to 80 psi or below. The IPC states the rule plainly: "Where water pressure within a building exceeds 80 psi (552 kPa) static, an approved water-pressure reducing valve conforming to ASSE 1003 or CSA B356 with strainer shall be installed to reduce the pressure in the building water distribution piping to 80 psi (552 kPa) static or less."

Low water pressure is a problem mainly because it makes everyday tasks frustrating: showers feel weak, filling a tub takes forever, and running two fixtures at once leaves both trickling. Below about 40 psi, most households start to notice the drop.

Low pressure rarely damages your home the way high pressure does, but it points to issues worth finding. Common causes include a failing PRV that is choking flow, scale and corrosion narrowing old pipes (a real concern in Phoenix, where the City reports water hardness in the range of roughly 10 to 16 grains per gallon, which the USGS classifies as hard to very hard), a partly closed main or meter valve, a clogged whole-house filter, or a problem out on the municipal main.

Aging infrastructure plays a part too. Water mains break and degrade over time, and roughly a third of the mains across the U.S. and Canada are more than 50 years old. A supply-side issue like that is outside your control, but a quick call to the water utility confirms whether the low reading is coming from the street rather than from inside your walls. If neighbors report the same weak flow, the cause is almost certainly upstream of your meter.

If only one faucet runs weak, the trouble is usually local, such as a clogged aerator, rather than whole-house pressure. If every fixture is weak at once, that is a whole-house pressure issue worth tracing. For a full walk-through of causes and fixes, see our guide on low water pressure across the whole house.

You test home water pressure with an inexpensive screw-on pressure gauge, available at any hardware store for about $10. The test takes a couple of minutes and gives you an exact number instead of a guess.

Follow these steps:

1. 1Turn off all water inside and outside the house. Shut off faucets, the dishwasher, the washing machine, ice makers, and any irrigation. You want zero flow so you measure true static pressure.
2. 2Find an outdoor hose bib, ideally one closest to where the main line enters the house. The hose bib nearest the meter gives the most accurate reading.
3. 3Screw the gauge onto the hose bib hand-tight, then open that bib fully.
4. 4Read the dial. A healthy reading lands between 40 and 80 psi, ideally near 60.

Take a reading at a few different times of day if you can. Municipal pressure often rises at night when neighborhood demand falls, so a 75 psi daytime reading can climb past 80 psi overnight. A gauge with a lazy hand that records the peak reading is useful for catching those swings. If your number sits above 80 psi or below 40 psi, the fixes below tell you what comes next.

What you do depends on which direction the pressure is off, but in both cases the fix is specific and solvable.

If pressure is too high (above 80 psi): install a pressure-reducing valve if you do not have one, or adjust the existing one. A PRV sits just downstream of the main shutoff where the line enters the home, and it lets you dial incoming pressure down to a safe target. Turning the adjustment screw clockwise raises pressure and counterclockwise lowers it; make small turns and re-test with your gauge after each. If you already have a PRV and the pressure still reads high, creeps up over time, or swings unpredictably, the valve itself may be failing. PRVs typically last around 7 to 15 years before they wear out. Our page on signs a pressure regulator is going bad covers how to tell. Adjusting the valve also adds a closed system, so a thermal expansion tank on the water heater is often needed to absorb pressure spikes.

If pressure is too low (below 40 psi): start by confirming the main and meter valves are fully open, then check any whole-house filter for clogging. If a PRV is present, a failing one can starve the house of pressure and may need adjustment or replacement. Older homes with scale-narrowed pipes are a frequent Phoenix culprit. Work through the full diagnostic in our low water pressure across the whole house guide.

If you hear banging pipes when valves shut, that is water hammer, and high pressure makes it worse. Lowering pressure with a PRV and adding arrestors usually quiets it; see water hammer and banging pipes for the details.

Getting your pressure into the 40 to 80 psi range, ideally near 60, protects your pipes, keeps appliances running longer, and trims water waste. If you are unsure whether your home has a working PRV or you cannot get a steady reading, a quick pressure test by a plumber settles it fast.