8 Main Reasons Why Your Kitchen Sink Has Low Water Pressure


The kitchen is the heart of the home, and having a steady water supply is crucial, especially when it comes to cooking and cleaning. If you’ve noticed that your kitchen sink water pressure is low, there could be several reasons.

Low water pressure is one of the most prevalent complaints among homeowners. It can be due to various factors, from sediment build-up in your home’s pipes to problems with the municipal water supply. No matter what the cause, low water pressure can be frustrating and even dangerous if it’s not addressed.

In this article, we’ll explore some of the most common reasons for low water pressure in the kitchen sink and what you can do to fix it.

Why Is My Kitchen Sink Has Low Water Pressure?

Free Water flows from the tap to sink Stock Photo

When you discover low water pressure, you should first figure out whether it’s affecting one area or the entire house. If it’s only the kitchen sink, there could be an issue with the water line that supplies the kitchen. However, suppose the low water pressure affects every faucet in your home. In that case, the problem is likely with your home’s main water supply.

There are several possible explanations for why your kitchen sink water pressure might be low. Here are a few of the most common causes:

đź’§Sediment build-up in pipes

One of the most common reasons for low water pressure is sediment build-up in your home’s pipes. Over time, minerals in the water can cause a build-up of deposits on the inside of your pipes, restricting the flow of water and leading to low water pressure.

Your pipes may be more susceptible to sediment build-up if you have an older home. In addition, if you have hard water, that can also contribute to the problem.

đź’§Clogged aerator

Another common reason for low water pressure in the kitchen sink is a clogged aerator. The aerator is the small screen at the end of the faucet that controls water flow. Over time, it can become clogged with sediment or other debris, restricting the flow of water and causing low water pressure.

đź’§Leaking pipes

When a water supply pipe bursts, the outcome could be poor water pressure. If there’s a lot of water under and around the kitchen sink, it could be a sign of a pipe leak. In addition, if you notice a sudden drop in water pressure, it could be due to a pipe leak somewhere in your home.

Because leaks aren’t usually obvious, look for watermarks along pipes in the basement and around faucets and water heaters. If you see any signs of a leak, it’s important to have it fixed as soon as possible, as it could lead to major water damage.

đź’§Municipal water supply issues

If the entire house is affected by low water pressure, the problem may be with the municipal water supply. It is especially likely if you’ve noticed a sudden drop in water pressure.

Issues with the municipal water supply can be because of several factors, including problems with the water main or a water main break. If you suspect that the problem is with the municipal water supply, you should contact your local water utility company.

đź’§Impaired water lines

Broken or damaged water lines frequently cause water pressure issues. Corrosion, dirt, and silt are common sources of water line damage, and when this happens, it affects surrounding faucets.

If you have an older home, your water lines may be more susceptible to damage. In addition, if you live in an area with hard water, that can also contribute to the problem.

Here’s how you can check the water supply lines:

  1. Turn off the water supply beneath the sink.
  2. Put a bucket under the sink to capture any remaining water that may leak out once the supply line is disconnected.
  3. Spin the nuts counterclockwise to loosen the water supply line below the sink. If they don’t turn, use a wrench to loosen them.
  4. Turn the water back on with the line pointing into the bucket.
  5. If water flows out, the source of low water pressure is most likely your faucet. In this instance, it’s necessary to replace the faucet.
  6. If no water comes out, contact a plumber who will be able to diagnose the problem.

đź’§Blocked or broken cartridge

The cartridge is the part of the faucet that controls water flow. If it becomes blocked or broken, it can cause low water pressure in the kitchen sink.

Here’s how you can check to see if you have a broken or blocked cartridge:

  1. First, turn off the water under the sink.
  2. Then, remove the handle by unscrewing it from the faucet.
  3. Next, remove the cover plate to access the cartridge.
  4. If you see any signs of corrosion or damage, it’s likely that the cartridge is broken or blocked and needs replacement.

đź’§Malfunctioning pressure reducing valve

If your home has a pressure-reducing valve (PRV), it might not be working properly at times. The PRV is installed on the main water line to your home and is responsible for regulating the water pressure. If it’s not working properly, it can cause low water pressure throughout your home.

If you think that the PRV may cause low water pressure in your kitchen sink, you should contact a plumber to check it.

đź’§Shut-off valve

The shut-off valve, commonly found under the kitchen sink, shuts off the water supply. Mineral deposits accumulate over time since this valve you don’t always turn on.

As a result, you will have weak washers. Leaks tend to form near the stem of the shut-off valve. In any case, check to ensure that the valve is entirely open before proceeding.

There’s a huge possibility that a shut-off valve could be the sole reason for the kitchen sink’s low water pressure. Whether there are double shut-off valves (one for hot and one for cold water), check to see if you need to replace both or just one of them. In general, replacing a malfunctioning shut-off valve is easier than trying to repair it.

What Is A Faucet Aerator?

NEOPERL ITR faucet aerators | 2018-03-20 | Plumbing and Mechanical |  Plumbing & Mechanical

Photo credits: PM Mag

If you observe that you can’t unscrew the faucet’s tip (the portion where the water comes out), you’ve undoubtedly also seen a little circular mesh screen inside the unscrewable metal component. The faucet aerator is a mesh screen made of plastic or metal that serves various functions. Faucet aerators are one of the most important but often overlooked faucet components.

The primary purpose of faucet aerators is to reduce water waste by mixing air with water droplets. It allows the water to flow out in a stream rather than a solid stream. As you can imagine, this saves a considerable amount of water over time.

In addition to saving water, faucet aerators also help to:

  • Eliminate splashing
  • Reduce noise
  • Increase water pressure
  • Prevent mineral build-up

The importance of a high-quality faucet aerator

While faucet aerators can last for years, they can become clogged with mineral deposits, which can reduce water pressure and flow. In some cases, the only way to clean a clogged aerator is to remove it and soak it in vinegar.

If your faucet aerator gets old or damaged, it’s important to replace it as soon as possible. A high-quality faucet aerator can make a big difference in the performance of your kitchen sink.

What Is A Faucet Cartridge?

A faucet cartridge is a replaceable internal component of a faucet. A typical faucet has two cartridges, one for hot water and one for cold water. The cartridges are usually made of plastic or metal. They contain a series of small parts that control water flow through the faucet.

Over time, these cartridges can become worn out or damaged, which can cause low water pressure, leaks, or other problems. If you’re having problems with your kitchen sink faucet, it’s a good idea to check the condition of the cartridges.

In most cases, replacing a worn-out or damaged cartridge is a relatively easy and inexpensive repair. However, if your kitchen sink has multiple problems, it may be necessary to replace the entire faucet.

What is a Water Pressure Regulator?

A water pressure regulator is a device installed on the main water line to your home. It’s responsible for regulating the water pressure coming into your home. If the regulator is not working properly, it can cause low water pressure in your kitchen sink (and other parts of your home).

If you think that the water pressure regulator may cause low water pressure in your kitchen sink, you should contact a plumber to have it checked.

How to Fix Low Water Pressure In Kitchen Sink?

Plumber, Handyman, Repair, Worker, Service, Repairman

Kitchen water has many uses and functions, from cooking to cleaning. Because of this, a sudden drop in water pressure can be quite a nuisance. A leaking faucet drip may not be enough to signal an impending water pressure problem. If you have noticed your kitchen sink water pressure has lowered significantly, a few things could be the culprit.

There are a few things you can check before calling a professional to take a look. Most likely, the problem is an easy fix that you can do yourself.

đź› Clogged Aerator

A clogged faucet aerator can be fixed in a few simple steps and is a do-it-yourself project. The following is a step-by-step instruction to clear a clogged aerator.

  1. To prevent debris from dropping and running down the drain, place a plug in the sink’s drain.
  2. Turn off the tip of the faucet handle in a counterclockwise direction to detach the aerator. If removing it with your hands is too difficult, use pliers. Wrapping plastic tape around the kitchen faucet should not damage it.
  3. To check for pressure, open the faucet without the aerator. If the water is flowing normally, you know you had a blocked aerator.
  4. Detach the screen from the aerator and clear out any debris clogging it with an old toothbrush. You can also do this by flushing it with water.
  5. If the minerals and dirt deposits are too stubborn to break down, boil the aerator in vinegar overnight. You can unblock the little holes with a pin one at a time.
  6. Once clear, reattach the screen to the aerator.
  7. Put the kitchen faucet back together by screwing on the aerator clockwise until it is tight.

đź› Blocked Cartridge

To cure the blockage problem, you’ll need to clean the cartridge, which you can do yourself. On the other hand, cleaning the cartridge can be much more difficult than cleaning the aerator.

  1. Begin by shutting off the water supply to your sink. Run the remaining water from your faucet until no more is flowing out.
  2. Using an Allen wrench, remove the screw cap, retaining nut, valve handle, including the screw that holds the faucet in place.
  3. Disconnect the handle on the shut-off valve as well.
  4. Check the O-rings and washers for any cracks or damage. If you find any, replace them with new ones that you can purchase at a hardware store.
  5. The next step is to remove the cartridge from the faucet body. Depending on the type of faucet you have, this may be easy or difficult.
  6. To clean the cartridge, soak it in vinegar overnight. In the morning, use an old toothbrush to scrub away any residue.
  7. Once the cartridge is clean, reassemble your faucet and turn on the water supply. Test the pressure to see if it has increased.

đź› Clogged Water Lines

If neither of the above solutions worked, the problem might be with your water lines. It’s possible that the pipes aren’t broken but rather have some dirt and debris in them, causing a partial obstruction. It’s fairly simple to remedy something caught in the pipes producing low pressure. A simple flush can solve the problem.

  1. Switch off the power supply valves to your sink. If you have a dishwasher, turn off the water supply valve to that.
  2. Disconnect the faucet head’s supply lines from the shut-off valves. You can use a wrench to do this, but be careful not to over-tighten and damage the valve.
  3. Turn on the faucet handles to allow any water still in the lines to drain out.
  4. Reconnect the supply lines to the faucet using a retaining clip or wrench.
  5. Test the water pressure in your kitchen sink to see if it has increased.

đź› Leaking Pipes

Leaking pipes are a common cause of low water pressure in the kitchen. If you suspect that your pipes are leaking, you can do a few things to check.

First, inspect all the pipes under your sink. You know your pipe leaks if you see any water on the floor or dripping from the pipes. If there are no obvious signs of leaks, put a few drops of food coloring in your toilet tank. If, after 30 minutes, the color has leaked into the bowl, you have a slow leak in your pipes.

You can also check for leaks through the water meter. Check the meter after closing the primary water valves. To do this, turn off all the appliances and faucets in your home that use water. Locate your water meter and check the reading if it moves, even slightly, your pipe leaks somewhere in your plumbing.

Once you’ve confirmed that your pipe is leaking, you’ll need to repair it as soon as possible.

đź› Bad Shut-Off Valve

If you’ve ruled out all of the above possibilities and still have problems with low water pressure, the issue may be with your shut-off valve. Over time, these valves can become clogged with sediment and dirt, restricting water flow.

If you’re serious about keeping your shut-off valve operational, you’ll need to repair it.

  1. Shut off the main water line so that no water flows into your home.
  2. Remove the valve handle so that you can access the screw holding it in place. Depending on your shut-off valve, you may need a special wrench to remove this screw.
  3. Pull out the valve’s stem and inspect it for any dirt or debris. Clean off anything that you find.
  4. Replace the stem and screw it back in place.
  5. Turn on the main water line and check the water pressure in your kitchen sink. If it has increased, you know that the problem was with your shut-off valve.

đź› Broken Pressure Valve

If your home has a pressure valve, it may be the source of your low water pressure. These valves are usually located near the water heater or main water line.

If you suspect that the pressure valve is the problem, you’ll need to test it to be sure.

  1. Turn off all the appliances and faucets in your home that use water.
  2. Locate the pressure valve and unscrew the cover. If there’s water inside, you have a broken valve and need replacement.
  3. If you don’t have a pressure valve or if testing it doesn’t reveal any problems, the issue may be with your water heater.

Frequently Asked Questions

Q: Why is my kitchen faucet running slow?

A: If your kitchen faucet is running slow, it could be due to several factors, including a build-up of sediment in the pipes or a problem with the water pressure. You can try cleaning the pipes or adjusting the water pressure to see if that solves the problem.

Q: How do I fix a slow-running kitchen faucet?

A: If your kitchen faucet is running slow, it could be due to several factors, including a build-up of sediment in the pipes or a problem with the water pressure. You can try cleaning the pipes or adjusting the water pressure to see if that solves the problem.

Q: How do I increase water pressure in my kitchen sink?

A: If your kitchen sink has low water pressure, there are a few things you can try. First, check for leaks in the pipes. If there are no leaks, the problem may be with the shut-off or pressure valve. You can try cleaning or repairing these valves to see if that solves the problem.

Q: Why does my kitchen faucet thump when I switch it on?

A: Water hammer is a typical condition that causes thudding or thumping in faucets. It happens when the water flow rapidly changes direction. The valves are most likely to blame if your faucet thumps when you turn it on. Water hammer is caused by loose valves that cause water flow to turn on and off abruptly.

Final Thoughts

Our kitchen sink is one of the most important portions of our kitchen. We use it multiple times a day for tasks like washing dishes, filling up pots and pans with water, and cleaning fruits and vegetables. That’s why it’s so frustrating when we turn on the faucet only to find that the water pressure is low.

Low water pressure can have many different causes, including clogged aerator, blocked cartridge, leaks in the pipes, a problem with the shut-off valve, or a broken pressure valve. If you’re having trouble pinpointing the source of the problem, you can always contact a plumber for help.

In the meantime, we hope that this article has helped you troubleshoot the issue and get your kitchen sink back to normal!

Recent Posts