Water Pressure Guide 101

In this blog post, you’ll read:The force per unit area that is used by a fluid to a surface is known as hydrostatic pressure. Both the fluid density and the liquid column height affect this pressure.
Table of Contents

Why need to know the water pressure

You need to be familiar with hydrostatic pressure to understand water pressure fully. The force per unit area that is used by a fluid to a surface is known as hydrostatic pressure. Both the fluid density and the liquid column height affect this pressure. Psi is a unit of measurement for water pressure (psi).

What is the water pressure?

The water pressure refers to the force measured to drive water through the mains and into your pipes. It is measured in “bars,” with one bar equal to the power required to propel water 10 meters in height. Yet, water pressure might vary substantially based on location. Remarkably, water pressure can fluctuate from room to room and during the day. Your mains water pressure may be reasonably low early, between 7 a.m. and 9 a.m. It is because other people in your region will also be taking showers and baths to start the day. Water pressure may decrease as people water their gardens during warm summer evenings.

water pressure testing
water pressure testing

Water Flow and Water Pressure, what is the Difference?

Water pressure measures the force required to get water through your main supply and into your home’s pipes. Water flow is a measurement of volume, i.e., how much water is simultaneously flowing through your pipes and outlets, such as taps and showers. The unit of measure for water flow is the liter per minute.

How is water pressure measured?

The water pressure in your home is measured in “bars” based on how far the water needs to be pumped. One bar is the force needed to push water up 10 meters. In general, anything with a water pressure of 0.3 bar or less needs a low-pressure tap or shower, and a water pressure of 1.0 bar or more requires a high-pressure shower or tap.

It is against the law for your primary water supplier to give you less than 1 bar of normal mains water pressure in your home. You can test this when pipework enters your property, usually at your home’s boundary.

water pressure test
water pressure test

Standard Water Pressure

The water pressure from municipal supply pipes might vary substantially from one area to another. The psi rating might range from around 20 to 100, posing problems. Never allow the incoming water pressure to exceed 75 psi. Expert plumbers and the majority of standard pressure regulators both recommend 50 psi as the perfect spot.

Since water pressure decreases significantly at each turn in the pipes, larger residences need a more excellent incoming pressure rating than smaller homes.

The simple act of checking and adjusting your water pressure can have significant financial and lifestyle benefits. Too much water could be wasted every day due to excessive water pressure. If it’s too low, you may be wasting time or not doing the job correctly when cleaning or bathing. (If you take showers, you probably want as much pressure as possible.)

Low Water Pressure Problems

low water pressure problems
low water pressure problems

What Causes Low Water Pressure?

Many things could cause low pressure, and most are easy to fix. Here are some common causes:

• Single Faucet

single faucet
single faucet

Often, this is because there is trash in the filter screen. One is usually at the end of the tap, and another is sometimes in the base. Just rinse and wipe away the dirt; the water flow should improve immediately.

• Valves Turn off

A main shut-off valve for the whole house and shut-off valves for your toilets, sinks, etc., often cause low water pressure. If they aren’t fully open, they can stop water from flowing, which lowers the pressure.


basin waste leaks
basin waste leaks

Leaky pipes can cause low pressure. Perform a pressure test and look for signs of a leak on the gauge. If the pressure fluctuates, you may need a professional to find and fix the burst pipe.

Failing Pressure Regulator

A pressure regulator or pressure-reducing valve that doesn’t work right is another common cause of low water pressure in homes. A water pressure regulator is a control valve that lowers the pressure going into your pipes to a safe level that won’t damage them. Some homes don’t have them, but if they do, a broken pressure regulator can cause the water pressure to go way up. It can also make the water pressure drop all of a sudden. When the pressure regulator breaks, every fixture in the house will be affected, and this happens quickly.

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How you can fix it:

This is not a quick fix, but it can assist with determining if the problem is with your regulator. Attach a water pressure gauge to the external hose spigot closest to the water primary or pressure regulator to get an accurate reading of the water pressure in your home. Depending on where you live, the ideal water pressure is up to 75 pounds per square inch. If your pressure test is deficient, it could mean your pressure regulator is broken and needs replacing. This is usually a job for a specialist.

Corroded Water Lines

corroded water lines
corroded water lines

                                           Figure 1 Corrode pipe

Pipes corrode when oxidation builds up inside the line, blocking water flow. Like mineral scaling, older galvanized steel pipes are susceptible to this issue. The tube that has been rusted will develop holes and eventually fail.

The most significant and costly cause of low water pressure is aging galvanized steel pipes’ corrosion. The corrosion in these pipes occurs inside (and is therefore ordinarily invisible), but the accumulation of corrosion and scale eventually blocks the line.

Because this issue builds up over decades, the decrease in water flow is gradual; the pressure will not suddenly drop. But, if you buy a vintage home with steel pipes, the pipes may already be severely corroded.

Fix Steps;

Corroded water pipes can only be replaced with new copper or plastic piping in the water supply system. It’s the only option here. Today, PEX tubing, not copper pipe, is typically the most cost-effective and installation-friendly choice for re-piping jobs.

Factors Affecting Water Pressure

Numerous factors might alter the water pressure in your home. To raise water pressure, it is possible to:

Check and clean the aerator

The aerator is the little screen located at the end of each faucet that mixes air and water, thereby regulating water pressure. If mineral deposits clog the aerator, it can lower water flow and pressure. Each aerator should be cleaned monthly to avoid this issue. In the case of shower heads, the aerator might become blocked with mold because many shower heads do not drain on their own.

Examine for clogs

examine for clogs
examine for clogs

The main water line and the smaller pipes that lead to individual faucets are susceptible to clogging. Even obstructions might arise within the water meter itself. If a clog impedes the flow of water, the pressure will decrease. One clogged pipe can reduce water pressure throughout an entire structure.

Examine the water supply pipe.

Suppose your home’s water supply line is made of an older galvanized steel pipe. In that case, the corrosion produced by minerals in the water might diminish water pressure. Pressure can be restored by replacing these pipes with modern plastic or copper pipes (depending on the local plumbing code).

Raising the water pressure in your home can enhance the overall water flow, making plumbing fixtures and appliances easier to use. It can also decrease the time required to fill a bathtub or operate a dishwasher. Suppose you believe any of the concerns above affect your low water pressure. In that case, you must solve them immediately.

What is the High Water Pressure?

While low water pressure is an annoyance, high water pressure can be terrifying. It can result in burst pipes, leaks, exploding boilers or water tanks, flooding, and mold growth. There are various warning indicators of excessive water pressure, and if you observe them, you should check the psi rating:

• Turning on or off a faucet causes banging and other sounds to emanate from the pipes.

• Faucets are dripping and spilling water.

• Sometimes, toilets run when no one use

increases water or sewage expenses without an increase in consumption.

More water is consumed in pipelines with higher water pressure in the same period. Hence, running a tap with a water pressure value of 150 psi may use two to three times as much water as running a tap with a water pressure rating of 50 psi.

What Causes High Water Pressure?

Most of the time, high water pressure is caused by the water supply from the city. Depending on what is required in your area, the water company may need to deliver water at a high-pressure rating. This is especially true when they must service tall buildings or areas high above sea level.

Thermal expansion is another possible cause. Your water pipes may get slightly warmer because of how hot it is in your home. Also, your water heater will make the water expand a little bit. The water will put more pressure on the pipes the hotter it is. Because of this, you should always keep your water heater set to a low or medium temperature.

How to adjust high water pressure in your house

If your faucets leak, your pipes bang, or your appliances keep breaking, it could be because the water pressure in your residence is too high—a few things you can do to determine if the high water pressure is due to these problems.

Step 1: Use a water pressure gauge to check.

water pressure gauge
water pressure gauge

                                   Figure 2 Water  pressure gauge testing

To see if your water pressure is too high or too low, you can use a gauge to measure how much force is being kept on the water when it is at rest. The water pressure in a home shouldn’t be more than 80 psi, so if your gauge shows more than that, you should call a plumber to look at it.

Step 2: Use a valve to lower the pressure

You might also be able to fix your problems with high-pressure water by putting in a pressure reduction valve. If you are new to DIY, you might want to hire a professional to help install it because it can be tricky if you don’t know your way around the pipes.

The pressure reduction valve will take a high pressure at the inlet and lower it to a lower pressure at the outlet to fix your pressure problems. Ensure you don’t turn down the mains stopcock when you install this, as that could cause the water flow to slow and the plumbing system to get noisy.

Step 3: Call your water supplier.

You should call your water company if your water pressure is much higher than usual. If the force is more than 100 psi, it could indicate an issue with the water supply network. The supplier is responsible for ensuring that your home gets the right amount of water, so if you think it’s too much, you should talk to them to see what can be done.

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