A Faucet dripping with low-pressured water

How to Diagnose Low Water Pressure in Faucet

Do you want to know if you have low water pressure in faucet? You’re on the right page! Read on to know more.

It can be frustrating if you’re not getting enough water pressure, having low water pressure in the faucet, or just simply wondering what causes low water pressure in only one faucet. While there are many causes why you have low water pressure, like a clogged sink, there are some easy ways to know the problems that don’t involve replacing the faucet.

So if you are experiencing a faucet with low water pressure or even in the entire house in general, this article might help you!

Check the water pressure

Before you begin any repairs, you must first check for the actual faucet water pressure low. This is important because if it’s not the cause of your problem, you might be wasting time and money on a repair that won’t solve anything.

To check for low water pressure at your faucet, turn all other water off in your home, so only one faucet is running. Then fill a glass until it overflows (you want to see what happens when everything else is working properly). If there isn’t enough flow or strength coming out of this glass compared to how much was used during normal, then this could be an issue with your plumbing system or the house itself (such as when it has been raining). In any case, call a plumber immediately so they can come to fix the problem before things get worse!

Check the shut-off valves

The first place to check is the shut-off valves under your sink. Most faucets have a built-in shut-off valve that should be turned off and tightly secured before you start working on the plumbing. First, make sure that there is enough water pressure for another faucet or appliance to work properly. If there isn’t enough pressure, turn on one of these other taps and make sure that it works correctly before continuing with any repairs.

Next, check if there are two valves under your sink (like hot/cold) or if there’s only one (for both hot and cold). If your plumbing has two separate valves, make sure both are turned off completely and securely tightened; otherwise, water can still come out even when they’re turned all the way down!

If you only have one valve under your sink (and it’s not a ballcock), look at how far up it needs to go before you get full pressure coming out of all spouts. It should be almost touching where it connects with its corresponding pipe coming from above ground level.

Use a water pressure gauge

You should also know that there are a few different types of water pressure gauges. What you need depends on what kind of faucet you want to test. If you want to test your kitchen sink or bathroom sink, then you need a gauge with an adapter for the end where it connects to the faucet.

If you’re looking for something that will work for your shower and tub, then there’s another type of gauge designed specifically for those fixtures. These gauges have rubber connectors instead of plastic ones like in other types of gauges—they’re meant to be used outside the shower or tub area so they won’t get damaged by moisture (and they help prevent rusting).

Replace old pipes

If you have older pipes, they may be corroded or cracked. This is often the case if your home has been in use for several years and there has been a lot of water pressure during that time.

You may want to consider replacing your old pipes with new ones if they’re damaged by freezing. If you live in an area where it gets very cold during the winter, there’s a good chance that your pipes froze at one point or another, thus damaging them.

The same goes for water pressure: if your home has high water pressure (or just plain old low-quality plumbing), then this can also cause damage over time.

Age is another factor—if your plumbing system was installed for a very long time already, it may have aging issues such as leaks or cracks due to normal wear and tear on the materials used to make up its structure.

Clean your faucet and showerhead aerators

Cleaning your faucet aerator is an easy process, and you can do it on your own in about 10 minutes. You’ll need a rag or paper towel, some vinegar, and a small bucket of water with some baking soda mixed in.

To clean the faucet aerator, turn off the water supply to the faucet by turning off its valve at the water meter or behind it. Remove any hoses connected to the faucet. With a rag or paper towel, soak up any standing water in the sink drain or tub drain. If necessary, remove and replace any screens at this time as well—you should have extra screens on hand if you’re afraid that one might be damaged during cleaning (or if they just look dirty).

Now, unscrew your aerator from its base with an adjustable wrench (or pliers). If there’s sediment buildup inside this part of your plumbing fixture, pour some vinegar into it through an opening near where water comes into contact with airflow inside; wait five minutes before pouring out excess liquid so that sediment doesn’t get carried over into another container when pouring out used vinegar solution later on.


Now that you have an answer to your question about what causes low water pressure in only one faucet, you can get back to using your tap and showers without any problems. If you’re still having problems, especially if it’s about low water pressure in house already, entrust the repair job to your local plumbers already. 

We at Oasis Plumbers are here to help you, so give us a call!