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  • Writer's pictureJustin Shook

Main Causes of Low Water Pressure and How to Fix It

Updated: Sep 26, 2023


water trickling from a shower head due to low water pressure
Water slows to a trickle from a shower head due to low water pressure.

Low water pressure in a home can be a frustrating problem, as it can make tasks like showering, washing dishes, and even using the bathroom a challenge. While there are many possible causes of low water pressure, understanding the underlying cause is important in order to determine the most appropriate solution. In this article, we will explore some of the common causes of low water pressure in a home, as well as some steps that can be taken to diagnose and fix the problem.



One of the most common causes of low water pressure is a problem with the main water supply line. This line is responsible for bringing water from the municipal water supply into your home, and any issues with this line can result in reduced water flow and pressure. Some potential problems that could cause low water pressure in the main water supply line include:


  • Corrosion or mineral build-up: Over time, the pipes in your home's water supply system can become corroded or clogged with mineral deposits, which can restrict the flow of water and cause low water pressure.

  • Water leaks: If there is a leak in the main water supply line, it can cause water to be lost before it reaches your home, resulting in low water pressure.

  • Valve issues: The main water supply line has a valve that is used to control the flow of water into your home. If this valve is not fully open, it can restrict the flow of water and cause low water pressure.

  • Municipal water supply issues: In some cases, low water pressure may be caused by problems with the municipal water supply system, rather than an issue with your home's plumbing.


Another possible cause of low water pressure is a problem with the water pressure regulator. This device is installed on the main water supply line and is responsible for regulating the water pressure in your home. If the water pressure regulator is not working properly, it can cause low water pressure. Some common issues that can cause problems with the water pressure regulator include:


  • Clogging: If the water pressure regulator becomes clogged with debris, it can restrict the flow of water and cause low water pressure.

  • Wear and tear: Over time, the water pressure regulator can become worn out or damaged, which can cause it to malfunction and result in low water pressure.

  • Incorrect installation: If the water pressure regulator is not installed correctly, it can cause low water pressure.


Another potential cause of low water pressure is a problem with the water pipes in your home. Some possible issues that can cause problems with the water pipes include:


  • Corrosion or mineral build-up: As mentioned above, the pipes in your home's water supply system can become corroded or clogged with mineral deposits, which can restrict the flow of water and cause low water pressure.

  • Water leaks: Leaks in the water pipes can cause water to be lost before it reaches your home, resulting in low water pressure.

  • Obstructions: If there are any objects blocking the flow of water in the pipes, it can cause low water pressure.

  • Pipe size: If the pipes in your home are too small, it can cause low water pressure.


If you are experiencing low water pressure in your home, there are a few steps that you can take to diagnose and fix the problem. Here are some tips for troubleshooting low water pressure:


  1. Check the main water supply valve: The first step in troubleshooting low water pressure is to check the main water supply valve. This valve is usually located on the main water supply line, and it is used to control the flow of water into your home. Make sure that the valve is fully open, as a partially closed valve can restrict the flow of water and cause low water pressure.

  2. Check for visible leaks: If you suspect that there may be a leak in the main water supply line or the water pipes in your home, you should check for visible signs of a leak. Look for areas where water is pooling or where the ground is wet and soft, as these could be indicators of a leak.

  3. Check the water pressure regulator: If you have a water pressure regulator installed on your main water supply line, you should check to see if it is functioning properly. To do this, you can use a water pressure gauge, which can be purchased at most hardware stores. Simply attach the gauge to a faucet in your home and turn on the water to see if the pressure is within the recommended range.

  4. Clean or replace the water pressure regulator: If you find that the water pressure regulator is clogged or damaged, you may need to clean or replace it in order to restore proper water pressure.

  5. Have a plumbing professional inspect your pipes: If you have checked all of the above items and are still experiencing low water pressure, it may be time to call in a professional plumber. The plumbing professionals at Premium Rooter Plumbing Services will be able to inspect your pipes and identify the underlying issues that may be causing low water pressure.


In conclusion, low water pressure in a home can be a frustrating problem, but by understanding the possible causes and taking steps to diagnose and fix the problem, you can restore proper water pressure and enjoy the full functionality of your home's plumbing system.


(Disclaimer: Premium Rooter Plumbing Services takes no responsibility for any and all damages or injuries to persons or property resulting from following the steps in this article. For professional installations, contact Premium Rooter Plumbing Services.)

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