PLUMBING HELP & TROUBLESHOOTING
High Water Pressure in Your House: Signs, Causes & Solutions
Is water blasting out of your taps, making pipes bang, or causing faucets to leak repeatedly? High water pressure can put unnecessary stress on your home’s plumbing. Learn how to recognise the warning signs, what may be causing the problem, and when to have your water pressure checked.
i
Strong water flow is not always a sign of excessive pressure. Measuring static water pressure
is the reliable way to investigate the problem.
PRESSURE
80
PSI
A useful reference point for residential plumbing
KNOW THE WARNING SIGNS
Leaks. Banging pipes. Repeated fixture failures.
These symptoms deserve a closer look.
THE SHORT ANSWER
What is considered high water pressure?
In residential plumbing, static water pressure above 80 psi (about 550 kPa) is an important warning threshold. Section 2.6.3.3 of the National Plumbing Code of Canada requires a pressure-reducing valve where static pressure at a fixture may exceed 550 kPa, to limit pressure to that level. The applicable code edition and local requirements should be confirmed for the specific property.
01 / UNDERSTAND THE PROBLEM
Why water pressure matters in your home
Your home’s plumbing needs enough water pressure to supply showers, faucets, toilets, dishwashers and washing machines properly. However, more pressure is not automatically better. When the incoming water pressure is too high, the force is carried through the pipes, valves, connections and fixtures throughout the plumbing system.
High water pressure may be present even when everything seems to work normally. In other homes, it becomes noticeable through persistent dripping taps, noisy pipes, leaking appliance hoses, or repeated problems with plumbing components. These symptoms can have other causes too, so pressure should be measured rather than assumed.
If you’re dealing with unusually forceful water flow or recurring plumbing leaks, the first step is to determine whether the problem comes from the incoming supply, a pressure regulator, a fixture, or another part of the system.
02 / WARNING SIGNS
7 signs your home’s water pressure may be too high
One symptom alone does not confirm high pressure. Several recurring symptoms together, however, are a good reason to have the system checked.
Water comes out unusually forcefully
Faucets or showerheads deliver a much stronger stream than expected, even when the fixture is only partly open. Compare fixtures carefully, as a particular tap or showerhead may also be responsible.
Pipes bang or knock
You hear knocking, thudding or sharp banging when a tap closes or an appliance stops drawing water. This may be water hammer caused by a sudden change in water flow; high pressure can make the effects worse.
Faucets and valves keep leaking
Taps, toilet fill valves or other plumbing components develop recurring leaks or wear out repeatedly. Worn seals and defective parts are also common causes, so a pressure test helps separate the possibilities.
Appliance hoses or connections leak
Water appears around washing machine hoses, dishwasher connections or other water-fed equipment. Stop using affected equipment if a connection is leaking, and address the leak before investigating the underlying pressure.
Toilets repeatedly develop valve problems
A toilet fill valve may become noisy, fail to shut off properly or need repeated repair. High pressure is one possible contributor, but worn or faulty fill valves can produce the same symptoms.
Pressure changes noticeably during the day
Water flow seems unusually strong at certain times or changes unexpectedly. Municipal supply conditions, a pressure regulator, a pump or other plumbing issues may be involved. A single observation cannot identify the cause.
Plumbing problems keep returning
Replacing a faucet cartridge or fixing one small leak helps temporarily, but similar problems appear elsewhere. Repeated failures are a reason to investigate the overall plumbing system instead of replacing individual components without checking the cause.
Important: A banging pipe does not automatically mean high water pressure.
Water hammer, loose pipes, faulty valves and other issues can produce similar noises.
A proper diagnosis looks at the symptoms together.
03 / WHAT CAUSES IT?
Common causes of high water pressure
Water pressure can be affected by the municipal water supply, the layout of a building’s plumbing and the condition of its pressure-control equipment. These are some of the main possibilities a plumber may investigate.
A
High pressure from the municipal water supply
Water utilities must supply water across areas with different elevations and demand. Pressure in a distribution main can be higher than is suitable for an individual home. Where the incoming pressure is excessive, the property’s plumbing may need an appropriate pressure-reducing arrangement.
B
A faulty or incorrectly adjusted pressure-reducing valve
A pressure-reducing valve (PRV), sometimes called a water pressure regulator, controls the pressure entering the building’s plumbing. If it becomes worn, sticks, is incorrectly adjusted or no longer controls pressure properly, downstream pressure may be too high or unstable.
C
A missing or unsuitable pressure regulator
Some plumbing systems may lack the pressure-control equipment required for their supply conditions. Other systems may have equipment that is not correctly sized or installed. A plumber can assess the installation and determine what the system requires.
D
Pressure changes associated with building equipment
Booster pumps, building water systems and other equipment can affect pressure. In multi-unit properties, the issue may involve shared mechanical equipment rather than an individual suite. Building management or a qualified plumbing professional may need to investigate.
E
Thermal expansion in a closed plumbing system
Water expands as it is heated. In a closed plumbing system, thermal expansion can cause pressure to rise when a water heater operates, even if the incoming supply pressure is otherwise acceptable. A pressure test taken at different times may help identify this type of problem.
These causes require different solutions. Replacing a pressure regulator will not necessarily resolve pressure increases caused by thermal expansion, and adjusting a regulator will not repair a damaged pipe or leaking fixture.
04 / CHECK BEFORE YOU GUESS
How to check whether your water pressure is too high
The most useful first step is measuring static water pressure: the pressure in the plumbing when water is not flowing. A pressure gauge designed for a suitable household connection can provide a reading, but the measurement must be taken correctly and interpreted in context.
01
Look for a pressure gauge reading
If you already have a suitable pressure gauge installed, note its reading and units. Do not remove fittings or open plumbing connections just to obtain a measurement.
02
Understand the 80 psi reference point
80 psi is approximately 550 kPa. The National Plumbing Code of Canada specifies pressure reduction where static pressure at a fixture may exceed 550 kPa. This is a technical threshold, not a recommendation to adjust a regulator yourself.
03
Notice when the symptoms occur
Record whether the issue happens continuously, after hot water use, when a washing machine runs, or when a valve closes. This information can help a plumber determine whether the issue is supply pressure, thermal expansion or water hammer.
04
Arrange a professional pressure assessment
A plumber can measure static pressure, assess pressure changes during use, inspect the pressure-reducing valve if present and determine whether other components need attention.
Don’t turn an adjustment screw just to see what happens.
Changing a pressure regulator without knowing the system’s requirements can leave pressure too high or reduce it unnecessarily. Avoid dismantling valves or pipe connections. If a pipe bursts or water is actively escaping, shut off the water supply if you can do so safely and contact a plumbing professional.
05 / WHY IT MATTERS
Can high water pressure damage your plumbing?
Yes. Excessive water pressure can place additional stress on plumbing components. The effects depend on the pressure level, the condition of the installation and the type of equipment connected to the water supply.
01
Premature wear
Seals, cartridges, fill valves and other moving components may experience additional stress.
02
Leaks and water damage
Failed hoses, fittings or weakened connections can release water into cabinets, floors or walls.
03
Pipe noise and water hammer
Sudden changes in flow can create pressure surges and banging sounds in the plumbing.
04
Unnecessary water use
Higher pressure can increase the amount of water discharged from some fixtures and outlets.
Not every plumbing failure is caused by high pressure, and reducing pressure will not repair a component that has already failed. The goal is to identify the actual cause, correct the pressure if necessary and repair any resulting damage.
06 / PROFESSIONAL SOLUTIONS
How a plumber fixes high water pressure
The right repair depends on the measured pressure and the condition of the home’s plumbing. A professional assessment may include the following steps.
Measure and confirm the pressure
Static pressure is measured and, where needed, additional checks are carried out to understand how pressure behaves during water use or water heating.
Inspect the pressure-reducing valve
If the system has a PRV, the plumber can inspect its condition and operation to determine whether it needs adjustment, servicing or replacement.
Install or replace pressure-control equipment if required
Where appropriate, a correctly selected and installed pressure-reducing valve can limit downstream pressure. The target setting depends on the installation and applicable requirements.
Investigate thermal expansion or water hammer
If the pressure rise occurs during water heating or the main symptom is pipe banging, the plumber may need to assess thermal expansion control, valves, pipe supports or water-hammer control measures.
Repair leaks and verify the result
Damaged components can be repaired or replaced as needed. Pressure should then be checked again to confirm the system is operating within the appropriate range.
07 / WHEN TO GET HELP
When should you call a plumber about high water pressure?
Arrange a plumbing assessment if your pressure reading is above the applicable limit, if your pressure regulator appears to be failing, or if you have recurring leaks, unusual pipe noises or repeated fixture failures.
If water is actively leaking, a pipe has burst or water is entering walls, ceilings or electrical areas, treat the situation as urgent. If safe, shut off the water supply. Keep away from wet electrical equipment and contact an appropriate emergency service if there is an immediate electrical or other safety hazard.
For routine pressure concerns, a measured diagnosis is preferable to replacing fixtures one by one. It helps identify whether the issue is the incoming supply, a pressure-reducing valve, thermal expansion or another plumbing fault.
08 / COMMON QUESTIONS
High water pressure FAQs
Answers to common questions about water pressure in houses and residential plumbing systems.
How do I know if my water pressure is too high?
A pressure gauge reading is the most reliable starting point. A static pressure above 80 psi (about 550 kPa) is an important threshold under the National Plumbing Code of Canada. Forceful water flow, banging pipes and recurring leaks can be warning signs, but they do not confirm the pressure by themselves.
Is 100 psi too high for a house?
100 psi is above the 80 psi (approximately 550 kPa) static-pressure threshold referenced in the National Plumbing Code of Canada. A qualified plumber should assess the installation and determine the appropriate corrective action.
Can high water pressure cause faucets to leak?
Excessive pressure can place extra stress on faucet seals, cartridges and connections. However, worn washers, damaged cartridges, corrosion and loose fittings can also cause leaks. The fixture and the system pressure may both need to be checked.
What is a pressure-reducing valve (PRV)?
A pressure-reducing valve is a plumbing device that reduces incoming water pressure to a controlled downstream level. It is used where pressure needs to be limited to protect the building’s plumbing and connected fixtures.
Can I adjust my water pressure regulator myself?
It is safer to have the system assessed before making adjustments. The correct setting depends on the installation, the measured pressure and applicable requirements. Incorrect adjustments can leave pressure too high or make it too low for the plumbing system.
Why does my water pressure increase when the water heater runs?
Heating water causes it to expand. In a closed plumbing system, that expansion can raise pressure. A plumber can determine whether thermal expansion is contributing and whether the system’s expansion-control arrangements are appropriate.
Can high water pressure cause banging pipes?
It can contribute to noisy plumbing, but banging is often associated with water hammer: a sudden change in water flow that creates a pressure surge. Loose pipes, valves and other installation issues can also cause noise.
Who should I call for high water pressure in Vancouver?
Contact a qualified plumbing professional who can measure the water pressure, inspect the pressure-reducing valve if present and identify the source of the problem. Proflow provides plumbing services in Vancouver and surrounding Lower Mainland communities. Call 778-927-6789 to discuss your plumbing concern.
PROFLOW PLUMBING, HEATING & GAS
Concerned about high water pressure?
Recurring leaks, banging pipes or unusually strong water flow deserve a proper diagnosis. Get advice on the next step for your home’s plumbing.
