High water pressure is defined as pressure that exceeds 80 PSI. Typically, the appropriate range is between 40 and 60 PSI. Continually high water pressure weakens your plumbing system, and seals and pipes become damaged.
It can cause premature breakdown of appliances and cause leaky showerheads and faucets. Municipal supply pressure, thermal expansion, and faulty pressure-reducing valves cause high water pressure in your home.
Quick Takeaways
- Water pressure above 80 PSI is considered too high.
- High pressure can damage pipes, fixtures, and appliances.
- Common causes include municipal supply pressure, faulty pressure-reducing valves, and thermal expansion.
- Signs include banging pipes, leaks, running toilets, and unusually strong water flow.
- A plumber can diagnose and correct pressure issues before costly repairs are needed.
What Causes High Water Pressure in a House?
1. Municipal Water Supply Pressure
You may experience high water pressure due to municipal water supply pressure. High water pressure occurs if your home is situated lower than the city’s pumping stations. It can also happen while the city supplies fire hydrants.
2. A Falling Pressure Reducing Valve (PRV)
Water enters your home from the main supply, and the pressure-reducing valve immediately reduces the pressure. The valve has a spring-loaded diaphragm that offsets the increased pressure.
You may notice several signs that indicate the valve is failing. First, you’ll notice a sudden burst of water when you turn on your faucet.
Reduced water pressure in your shower is another sign. Visible leaks and banging noises could indicate high water pressure. You may also notice leaks around your appliances, such as your washing machine.
3. Thermal Expansion in Your Plumbing System
Water heated inside your water heater will expand by about one-half gallon. This introduces the expansion factor. Thermal expansion is caused by pressure from heated water.
Water molecules move further apart and faster when heated. If the water is trapped, it can dramatically increase a pipe’s internal pressure.
Modern homes have a pressure-reducing valve to regulate pressure. It will create a closed-system trap that captures expanding water inside your pipes. However, if it fails, the water is compressed inside the inner walls of the pipes, then water pressure increases.
4. Elevation and Location Factors
The elevation of your home could cause high water pressure. If its elevation is lower than the water column, gravity contributes to high water pressure. An intense gravitational force increases the water pressure.
Signs Your Water Pressure Is Too High
You may not know when your water pressure is too high. However, there are many signs.
First, you may notice banging or knocking pipes. Next, your toilets may run longer than usual, and your water bills could increase significantly.
Leaks or appliance failures could indicate high water pressure. You may also have high water pressure if you’ve had to replace several plumbing components prematurely.
Why High Water Pressure Is Dangerous
High water pressure is dangerous and can create chaos in your plumbing. It can cause leaky or broken pipes, water heater damage, and fixture wear and tear. You may have to replace your appliances prematurely and incur increasing plumbing repair costs.
How to Test Your Home’s Water Pressure
You can test your home’s water pressure by using a water pressure gauge. The gauge is connected to the spigot on the main water line. You should ensure all appliances and fixtures that draw water are turned off.
Next, turn on the spigot and watch the gauge needle move. Note the highest pressure reached. The water pressure should be between 40 and 60 PSI. If it is over 80 PSI, you have high water pressure. You should call a plumber if the gauge shows high water pressure.
How to Fix High Water Pressure
The plumber will adjust or replace the pressure-reducing valve. They can turn the adjustment bolt counterclockwise, and it will decrease the pressure. However, if the pressure-reducing valve is faulty, the plumber will replace it.
The plumber may also recommend installing an expansion tank to manage thermal expansion. When the water expands, it will move to the tank.
It’s important that you schedule a professional inspection for a proper diagnosis. A plumbing professional can fix your plumbing and prevent future plumbing damage.
When to Call a Plumber for High Water Pressure
You should contact a plumber if you consistently have high water pressure above 80 PSI. If not, you could see recurring leaks and water heater issues. A plumber can manage suspected pressure-reducing valve failures.
Frequently Asked Questions
Can high water pressure cause pipe leaks?
Yes, high water pressure can cause pipe leaks. It can strain the joints and fitting, causing them to loosen.
What PSI is too high for residential plumbing?
You have high water pressure if your PSI reading is 80 or higher. The appropriate reading is between 40 and 60 PSI.
Can a water heater increase water pressure?
Yes, thermal expansion happens when heated water expands. This causes pressure to build, having nowhere to go in a closed-loop system.
How do I know if my pressure-reducing valve is bad?
You may notice signs, such as a sudden burst of water when turning on kitchen or bathroom faucets. You may also notice reduced water pressure in your shower, visible leaks, and banging noises.
Is high water pressure considered a plumbing emergency?
Yes, because high water pressure is dangerous and could cause catastrophic plumbing damage.
Protect Your Plumbing System From High Water Pressure
It’s critical that you schedule plumbing inspections. Early detection is key to preventing serious plumbing problems, including damaged pipes, fixtures, and appliances. Whenever you notice a plumbing problem, it’s important to contact a professional for fast repairs.
If you suspect high water pressure is damaging your plumbing system, contact Benjamin Franklin Plumbing for professional plumbing repairs in Gainesville, FL and the surrounding areas. Our Punctual Plumbers can diagnose the cause, protect your pipes, and help prevent costly water damage before it becomes a major problem.
Modern methods of leak detection use non-invasive tools to locate hidden water leaks.
Yes, using any of the above methods, and there are others, enables a plumber to accurately and non-invasively determine the location of leaks inside a floor, wall or ceiling.
Most homeowners picture plumbing leaks as gushing pipes and inundated basements. Most leaks are actually much less dramatic, and a lot harder to find. They usually start in hidden areas behind walls, under floors or around appliances, quietly causing damage long before anyone notices.
There are a few ways you can potentially tell why your faucet is dripping.

Unexplained
Plumbers have a number of tools and techniques they can use to diagnose what’s causing your low water pressure. They might start with valve inspections to make sure they are open and working correctly.
At Benjamin Franklin Plumbing, we serve homes throughout Gainesville, FL and surrounding areas.
Quick Takeaways
Time-based system – Regenerates on a fixed schedule (regardless of water use).
It’s important to adjust your regeneration frequency accurately to ensure efficient operation and prevent hard water scale buildup.
Making sure that the toilet flange is flush with the floor is an important part of every installation. The flange is the part that holds the toilet securely in place. If it is the wrong height, then the toilet might not have the right seal to prevent leaks and other problems.
Our professional plumbers follow the proper protocols to ensure that we install flanges at the correct height, but the one in your home might still get out of place due to the following reasons.