Water Pressure Drops When More Than One Faucet Is On | The Troubleshooting Guide

While using more than one faucet, do you experience a quick decline in pressure gradient or low water pressure? 

Surely, you’re aware of water pressure drops when more than one faucet is on. Usually, in showers, kitchens, and other places wherever two faucets or waterways drain water, it’s a frustrating but typical issue. 

Nothing messes up a wonderful warm shower as if someone flushes the commode in the next bathroom, which causes the pressure in your bathtub to fall and concurrently blast you with hot water. Right? 

If you’re facing issues like this, then this troubleshooting guide is only for you. In this article, we will discuss the most possible reasons for low water pressure while more than one faucet is on. Here, you will find a quick table of data to know the reasons and fixing process. Further, we will discuss this in detail for your convenience. 

Let’s dive in! 

Why Does Water Pressure Drop When More Than One Faucet Is On | The Most Possible Reasons 

Possible CausesQuick Solutions
Problems in pressure relief valveChange the valve with the help of a professional plumber
Slightly closed shut-off valveReopen the valve
Blocked pipes due to mineral depositsThoroughly clean the debris with water and vinegar solution
Defective water lineReplace or change the water line with a licensed plumber
Trapped air into the pipelineOpen every faucet in the house and flush the bathroom to release the air 
Corroded plumbingReplace all of the wiring in your house

There are various possible causes of water pressure drops when more than one faucet is on well water. These are the following: 

READ ALSO  Toilet Flange Too High – 4 Ways to Avoid Blunder

Issue 1: Pressure Relief Valves

The low water pressure might be a result of problems with the pressure-relief valve. The PRV valve may be the source of the issue if the water pressure comes out normal before dropping. 

When the water pressure is more than 80 lbs/square inch, these are frequently seen in drainage systems or other similar settings. However, too high of water pressure can cause damage to the valves and faucets. 


If you face issues with the Pressure Relief Valve, consider changing the valve to check whether it has an impact on your home’s water pressure. However, if it has no impact, you may have to replace the complete unit. 

The recommended water pressure for housing units is 45 to 55 lbs / square inch. But typically, it lies in the 45–80 psi range.

Issue 2: Shut-Off Valve

Examine the shut-off valves for additional faucets and the main water system. Make certain that the valve is fully open because even a small amount of closure could lower the water pressure. 

If there is a slight bump into the valve during your home’s sewage, the shut-off valve may be in the wrong place. This might be an issue what can cause low water pressure in one faucet


If the shut-off valve is slightly closed, you may notice a low water pressure. Reopening the valve of the main water supply can solve this issue. Nonetheless, you should follow the right way to open the valve. 

Depending on the type, you’ll need to open the valve. If it is a pivot-style valve, push the lever until it is parallel to the plumbing system. Rotate a wheel-style valve counterclockwise until it becomes snug to release it. Then, rotate this a quarter twist in a clockwise manner to stop the valve from sticking or releasing a leakage.

Issue 3: Blocked Pipes

There may not be enough water pressure coming out of your home’s faucets if the pipe inside your dwelling has been blocked for any reason. This may be due to the buildup of minerals and debris in the pipeline. Different regions of your home will experience lower water pressure as a result of the disturbed flowing water.

READ ALSO  4 Things You Should Do If The Grohe Kitchen Faucet Won't Swivel


To fix this issue, simply wash out the mineral buildup from the pipeline with soapy water. If you notice sticky white deposits, white vinegar can become effective. Put some white vinegar into a plastic container and hang it from your faucet with an elastic band. The vinegar will loosen the deposits if you immerse the faucet’s head for a little time. 

Issue 4: Defective Water Line

Another possible cause could be a damaged or constricted water line. Your home will frequently experience problems from broken or constricted water lines, which are not limited to just two faucets.


A faulty water line requires nothing but a replacement by a professional plumber. Although this will be a bit expensive, it will be worth the money. 

Issue 5: Trapped Air 

Wondering what can a dripping tap affects water pressure? Your apartment’s water pressure may decrease if there is entrapped air in the pipelines. Water works as a kind of valve as it travels through the pipelines and onto your tap, generating gibbering and irregular spikes of water flow.


Opening every tap in the home simultaneously while flushing the bathrooms is a common way to release the trapped air.

Issue 6: Corroded Plumbing

As a result of rusting, oxidation builds up on the inside walls of pipes, obstructing the movement of water. Corrosion in a home’s wiring over time can lead to a variety of problems. If the rust worsens, it could result in leaks, low water pressure, and other issues. 


It will take a lot of work and money to replace all of the wiring in your house, but it’ll be worthwhile.

This Video Will Help You Too!

Frequently Asked Questions (FAQs) 

Why is water pressure low in one bathroom but not the other?

You may notice low water pressure in one bathroom but not the other due to the mineral buildup that blocks the valve. Simply unlock the valve and check out the blockage. If there are white sediments, wash them out with soapy water.

What causes low water pressure in all faucets?

A blockage in the main water supplying pipe is usually responsible for low water pressure in all faucets. This clogging may occur due to corrosion and mineral deposits throughout the pipeline. Trapped air can also be a culprit for this blockage.


Low water pressure is the most frequent problem with house drainage that can damage faucets, bathrooms, and other water systems. Most importantly, water pressure drops when more than one faucet is on is the most bothersome issue. Many of us tend to face this problem frequently. 

But when you know the possible reasons behind this you can find the best solution. Already you’ve known the most common causes behind this issue. We hope the above table chart with the best solution will come in handy. Also, we hope you find the YouTube video link useful whenever you face any problem with low water pressure in your faucets.

You Can Also Read:

Check out our Reusable Bamboora Paper Cloth Towels

While shaping the aim of making the environment clean and healthy, Bamboora deals with the production of natures way bamboo paper cloth towels. These bamboo towels are better for the environment.
Along with doing lots of plumbing work, they are usable for other house chores too. From wiping out the spill on the floor to cleaning the dust, bamboo paper towels effectively perform their work. They are effective in replacing regular cloth towels that you often purchase. The natural strength and softest fiber of bamboo make them one of the best sustainable bamboo paper towels.

Similar Posts