To restore water flow due to a clogged
Remove and clean the faucet aerator thoroughly, or replace it with a new one. Remove and clean the flow restrictor, increase the size of the flow restrictor hole, or remove it entirely and replace the aerator without replacing the flow restrictor.
If the low water pressure seems restricted to a single faucet or showerhead, the problem isn't with your pipes or water supply, but with the fixture itself. If it's a sink, the most common causes are a clogged aerator or clogged cartridge.
Damaged washers reduce your tap's water supply to a trickle, before stopping it completely. If your tap starts producing only a trickle of water, you should consider replacing your washer. Similarly, if excessive whistling or chattering noises are coming from your tap, this is usually caused by a dislodged washer.
The short answer is low water pressure in your home arises due to a number of causes. Some include a shut or blocked water meter valve, mineral buildup clogs pipes, corroded pipes, or even a crack in the main city supply pipe to your home.
Pressure-Reducing Valve
Look on the main supply pipe near your water meter for a conical valve that has a bolt sticking out of the cone. To raise pressure, turn the bolt clockwise after loosening its locknut.
Clogged aerator screen
The aerator is the first to check when a faucet has low water pressure. Most faucets have aerators at the base or inserted inside the spout. Sediments, mineral deposits, or small debris can clog the aerator over time, which results in low water pressure.
If the kitchen is the only tap with low pressure, it's time to consider the potential causes of low water pressure in a kitchen sink so you can determine what might be causing it, and fix it. The most common causes of low water pressure in a kitchen sink are a clogged aerator or a clogged cartridge.
A fast drop in only one faucet means there's a problem with the faucet. Rapid low pressure affecting one area of the house may mean a corroded pipe issue. An abrupt water pressure drop affecting the whole house may mean a water main break (municipal water) or a well pump problem (well water).
If there's an accumulation of sediments in your hot water tank, it can lower your water pressure. The presence of kinks in the flexible water pipes used in water heaters can result in low water pressure. If the shut-off valve isn't fully open, water pressure can drop.
While several factors can cause weak water pressure, common culprits include a broken pressure regulator, faulty water heater, clogged fixtures, or a hidden leak.
Adjust the Pressure-Reducing Valve
Protruding from the top of the valve is a threaded bolt. To raise pressure, loosen the bolt's locking nut, then turn the bolt clockwise. Use the pressure gauge to determine when you reach a water pressure around 50 PSI. Then, tighten the locknut to secure the valve.
A quick and easy way to increase water pressure is to adjust the pressure-reducing valve, which can be found in your home, usually close to your water meter.
Signs that a cartridge faucet needs repair are water dripping from the spout, difficulty in adjusting the water temperature, hot water entering cold water outlets like toilet supply lines and inadequately heated water at some faucets.
Low pressure is the most common sign of a clogged aerator, but sometimes the faucet can also misdirect water, spraying it on the side of the sink or even onto the vanity.
Check for Deposits and Debris
Use your little finger or a small screwdriver to check inside the faucet spout for any parts that may be stuck inside. If they are stuck in place with mineral deposits, you may need to pry out the parts with a screwdriver. Also, clear out any deposits or debris from inside the spout.
A Clogged Cartridge
This device has an important job — when you lift or turn the faucet handle, the cartridge is responsible for opening valves and letting the water flow into your sink. If there's a problem with the cartridge — such as a blockage — you're likely to encounter low water pressure.