Fix Low Water Pressure in Your Home

Low water pressure is one of those problems that creeps up on you—a shower that goes from strong to weak, a kitchen faucet that dribbles instead of flows. It's frustrating, but it's also one of the most fixable plumbing issues you'll encounter. The cause is almost always straightforward: sediment and mineral deposits clogging aerators, a partially closed valve somewhere in your system, or occasionally a leak on the main line. The good news is that most of these fixes take an hour or less and cost almost nothing. You don't need a plumber for this unless the problem is deep in your main water line, which is rare. Start with the simple checks—they work more often than you'd expect.

1. Find the Scope First. Turn on a faucet in your kitchen, then check the bathroom sink, shower, and an outdoor hose if you have one. If only one or two fixtures are weak, the problem is local to those fixtures. If everything is low pressure, the issue is in your main line or main shut-off valve. This distinction saves you hours of troubleshooting.
2. Verify the Main Valve. Find your main shut-off valve—usually near the water meter in a basement, crawl space, or outside on the street side of your home. It's a round handle valve, ball valve, or gate valve. Turn it slowly clockwise to verify it's fully open. A partially closed valve (someone may have closed it partially during repairs) is the single most common cause of whole-house low pressure. If it was partially closed, open it fully and check your pressure immediately.
3. Clear the Mineral Clog. Unscrew the aerator (the removable screen at the faucet tip) by hand or with a wrench if it's stuck. Hold it up to the light—you'll likely see white, chalky mineral deposits clogging the small holes. Soak the aerator in a bowl of white vinegar for 30 minutes to dissolve the sediment. While it soaks, flush out the faucet spout by running water full blast for 10 seconds. Scrub the aerator with an old toothbrush, rinse it thoroughly, and screw it back on.
4. Open the Supply Stops. Look under the kitchen and bathroom sinks. You'll see two small valves—one supplies cold water, one supplies hot. These valves are often turned to control water during repairs and then forgotten. Turn both valves fully counterclockwise to open them completely. If one was partially shut, that's your culprit. Listen and feel for water flow to confirm the valve is working.
5. Hunt for Hidden Leaks. Walk your basement or crawl space with a flashlight and look at exposed pipes for water dripping or pooling. Even a small leak on the main line will reduce pressure throughout your home. If you spot a leak, mark it clearly but don't try to fix it yourself—a leak on the main line requires a licensed plumber and may require digging up your yard.
6. Measure the PSI. Buy a water pressure gauge at the hardware store ($8-12). Attach it to an outdoor spigot or the laundry room sink. Normal residential pressure is 40-80 PSI. If you're reading below 40 PSI consistently, your main line or meter may be the problem. If pressure is normal but you still have weak flow, the issue is likely mineral buildup in your pipes, which requires flushing or replacement—call a plumber.
7. Inspect the Water Heater. If only hot water pressure is low, the problem is likely in your water heater. Check that the shut-off valve on the cold water inlet (the blue handle on top of the tank) is fully open. If it is open, your water heater may have mineral buildup inside—drain a bucket of hot water from the drain valve at the bottom of the tank and look for sediment. Sediment buildup reduces both temperature and pressure on hot water.
8. Flush the Main Line. If you've cleaned aerators and opened all valves but pressure is still below 50 PSI, your main water line may have sediment buildup. Attach a garden hose to an outdoor spigot and open it fully for 5-10 minutes to flush the line. This sometimes works for recently degraded pressure. If pressure doesn't improve after flushing, the main line likely needs professional attention.
9. Know When to Call. If you've completed steps 1-7 and pressure is still low throughout your home, the issue is likely inside your main water meter, in the municipal supply line, or deep in your private main line. Write down what you've checked: main valve open, all aerators cleaned, all fixtures tested, pressure gauge reading. This information saves the plumber time and keeps your bill lower.
10. Confirm the Fix Works. After cleaning or replacing aerators, screw them back onto faucets by hand until snug—don't over-tighten. Turn on the faucet and confirm pressure has improved. If you've cleaned multiple aerators, test each one. This is your confirmation that your fix worked.