You need a pressure gauge — a $10 to $15 tool that screws onto any outdoor faucet

Water pressure is measured in pounds per square inch, or PSI. Most homes run between 40 and 80 PSI, and your local water company sets the pressure at the meter. To find out what yours is, you buy a water pressure gauge — a small brass or plastic device with a dial or digital readout — screw it onto an outdoor faucet, and turn the faucet on. The gauge shows your pressure in seconds. That's the entire process.

You can buy a pressure gauge at any hardware store, home center, or online retailer for $10 to $20. Look for one labeled "water pressure gauge" or "hose-end pressure gauge." Digital gauges cost more but are easier to read. Analog gauges (the kind with a needle) are cheaper and just as accurate for a quick check.

The reason to check is straightforward: pressure that's too low means weak flow and slow-filling fixtures. Pressure that's too high damages pipes, water heaters, and appliances over time. Knowing your pressure tells you whether you need a regulator installed or whether a problem is on your side of the meter or the water company's.

Key Takeaways

  • A water pressure gauge screws onto any outdoor faucet and costs $10 to $20 at any hardware store.
  • Normal household pressure is 40 to 80 PSI; below 40 means weak flow, above 80 means risk of damage to pipes and appliances.
  • Check the pressure at the faucet closest to your water meter for the most accurate reading of what the water company is delivering.
  • If pressure is consistently above 80 PSI, a pressure regulator installed at the meter can protect your plumbing.

Where to check and what time of day matters

Check the pressure at an outdoor faucet, preferably the one closest to your water meter. This gives you the pressure the water company is sending into your home before it travels through your pipes and loses some force along the way. If you only have indoor faucets available, use the one nearest the meter — usually in a basement, crawl space, or utility room.

Time of day affects the reading. Check in the early morning before most neighbors are using water, or in the evening after the peak usage hours (usually 6 to 9 a.m. and 5 to 8 p.m.). Pressure drops when many people in your area are drawing water at once. A single reading at 2 p.m. on a Tuesday tells you less than readings taken at different times over a few days.

Turn off all water use in the house before you check — no showers, no laundry, no toilet flushing. Even one running faucet inside changes the reading. Wait a minute after everything is off, then screw the gauge on and turn the faucet on fully.

Reading the gauge and what the numbers mean

Screw the gauge onto the faucet by hand — you don't need a wrench. Turn the faucet handle all the way on. The gauge needle or digital display will jump to a number within a few seconds. That number is your water pressure in PSI. Turn the faucet off and unscrew the gauge.

A reading between 40 and 80 PSI is normal and healthy. Below 40 PSI and you'll notice slow showers, slow-filling toilets, and weak spray from outdoor hoses. Above 80 PSI and you're putting stress on pipes, water heater tanks, and washing machine hoses. Pressure above 100 PSI is high enough to cause leaks and burst pipes over months or years.

If your reading is consistently above 80 PSI, write down the number and call a plumber. They can install a pressure regulator at the meter — a device that reduces incoming pressure to a safe level. This is a one-time job that costs $300 to $500 and protects everything downstream.

Pressure that changes throughout the day

If your pressure swings wildly — 50 PSI in the morning, 90 PSI at dinner time — that's normal. The water company adjusts pressure based on demand. Pressure that climbs and stays high all day, or that drops and stays low, points to a problem on your side or theirs.

Low pressure that doesn't change suggests a leak in your main line, a clogged meter, or a problem at the water company's pump station. Call your water company and report it. They can check the pressure on their side of the meter at no cost. If theirs is normal and yours is low, the problem is between the meter and your house.

High pressure that doesn't drop suggests your pressure regulator (if you have one) is failing, or the water company is delivering pressure above normal. A failing regulator needs replacement. If the water company is delivering high pressure, a new regulator solves it.

What to do if pressure is too low

Low pressure inside the house can come from several sources. First, check the pressure at the meter. If it's normal there but low at your kitchen sink, the problem is in your home's plumbing — a partially closed valve, a clogged aerator, or a leak somewhere in the line.

Check that the main shut-off valve (usually near the meter or where the line enters the house) is fully open. It's a lever or a round knob. A lever should point along the pipe; a knob should turn counterclockwise until it stops. If it was partially closed, opening it may restore pressure.

If the main valve is open and pressure is still low at the meter, call your water company. Low pressure at the meter is their responsibility. They may need to clean the meter, adjust the regulator on their side, or investigate the main line in the street.

What to do if pressure is too high

High pressure at the meter means the water company is delivering more force than your home's plumbing is designed for. The fix is a pressure regulator installed at the meter or just inside the house. A plumber can do this in a few hours. The regulator is a brass fitting about the size of a soda can that screws into the line and automatically reduces pressure to a safe level (usually set to 60 or 70 PSI).

Don't ignore high pressure. Over time it causes pinhole leaks in copper pipes, cracks in PVC, leaks at joints, and shortened life of water heaters and appliances. A regulator costs $300 to $500 installed and pays for itself by preventing a burst pipe or a flooded basement.

If you rent, report the high pressure to your landlord. They are responsible for installing a regulator. If they don't, high-pressure damage to the building is their liability, not yours.

Checking pressure on a well system

If your home has a well instead of city water, the pressure is controlled by a pressure tank and a pump. The tank maintains pressure between a low and high setting — usually 30 to 50 PSI on the low end and 50 to 70 PSI on the high end. You can check the pressure the same way: screw a gauge onto any faucet and turn it on.

Well pressure that's too low (below 30 PSI) means the pump isn't building pressure, the tank is waterlogged, or the pump has failed. Well pressure that's too high (above 80 PSI) means the tank's air charge is too high or the pressure switch is stuck. Both are plumber jobs. Call a well service company or a plumber who works on wells.

Well systems are more complex than city water, so if your pressure is off, don't try to adjust it yourself. A pressure tank adjustment requires draining the tank and adding or removing air with a compressor — work that's straightforward to get wrong.

Frequently Asked Questions

Can I check water pressure without buying a gauge?

No. You need an actual gauge to see the number. You can't judge pressure by how hard water comes out of a faucet — weak flow might be low pressure, or it might be a clogged aerator. A gauge costs $10 to $15 and is the only way to know for sure.

What if my pressure is different at different faucets?

That's normal. Faucets farther from the meter lose a little pressure along the way. Check at the outdoor faucet closest to the meter for the most accurate reading of what the water company is sending. If one indoor faucet is much weaker than others, the problem is that faucet's aerator or a leak in that line.

Do I need to turn off the water heater before checking pressure?

No. The water heater doesn't affect the pressure reading at a faucet. Check any faucet — hot or cold — and you'll get the same pressure.

How often should I check my water pressure?

Once a year is enough for most homes. Check more often if you notice weak flow, hear banging in the pipes, or see leaks at joints. If you've had a regulator installed, check once a year to make sure it's still working — a failing regulator will let pressure creep back up.

Is high water pressure dangerous?

Yes, over time. Pressure above 80 PSI causes slow leaks at pipe joints and fittings, pinhole leaks in copper pipes, and damage to water heaters and appliances. A burst pipe or a failed water heater tank can flood a basement or wall. A regulator prevents this.