Having low water pressure at home is a frustrating problem: weak showers, faucets that barely fill a glass of water, washing machines that take longer, and daily discomfort that can worsen over time. In many cases, the problem is simple to solve; in others, it may indicate a serious plumbing malfunction.
This comprehensive guide explains the most common causes, how to diagnose the problem, the best solutions, and when to seek professional help. If you prefer immediate assistance, the Canalizador de Lisboa It is the fastest and safest solution for solving water pressure problems in any house or apartment.
Why is the water pressure low?
Low blood pressure can have several different causes. Identifying the cause is the first step toward effectively resolving the problem.
1. Partially closed shut-off valve
One of the most common—and easiest to fix—reasons is that the water inlet valve is partially closed. A small adjustment is all it takes to restore the pressure.
2. Lime buildup
In areas with very hard water, it is common for limescale to build up on taps, aerators, showers, and even inside pipes, significantly reducing water pressure.
3. Problems in the public network
Sometimes, low pressure does not originate inside the home. Roadworks, network maintenance, or supply problems can cause temporary pressure instability.
4. Old or corroded pipes
In older buildings, iron or copper pipes can corrode or become partially clogged, reducing water flow. In these cases, partial or total replacement may be necessary.
5. Hidden leaks
An internal leak—especially within walls—consistently reduces pressure. It also increases your bill and can cause structural damage.
6. Inadequate pipe sizing
If the pipes are too narrow or poorly installed, the pressure will never be ideal. This problem is common in poorly done renovations or old installations.
7. Insufficient pressure in the toilet flush or water heater
Water heating equipment that requires minimum pressure may fail if the overall pressure is too low.
How to diagnose low blood pressure at home
Before calling a professional, there are a few simple tests you can perform:
1. Check whether the problem is general or only at one point
Open several taps in the house. If only one has low pressure, the problem is at that specific point (clogged aerator, damaged cartridge, etc.). If it is general, the cause is in the internal network.
2. Test the aerator and showerhead
Aerators and showerheads easily accumulate limescale. Remove them and test the water without them. If the pressure improves, you've found the culprit.
3. Check the shut-off valve
Ensure that it is fully open. Often, construction or maintenance work causes it to be left partially closed.
4. Check the water meter
If all the valves are closed and the meter continues to run, there may be a hidden leak.
5. Ask your neighbors
If everyone is experiencing low pressure, the problem lies with the public network. The water company can provide information about interruptions or maintenance—see, for example, the website of EPAL for official information.
Solutions for low water pressure
Depending on the cause, the solution may be simple or require technical intervention.
1. Cleaning aerators, filters, and showerheads
Limescale buildup is easy to fix: simply disassemble the parts and soak them in hot vinegar.
2. Replacement of cartridges or faucet mechanisms
Worn cartridges prevent water from flowing properly. Replacing the component usually solves the problem immediately.
3. Repairing leaks
If there is a leak, the pressure will only return to normal after repairing the cracked pipe or faulty connection.
4. Unclogging internal pipes
Partially clogged pipes need to be cleaned with specific tools, especially in older installations.
5. Total or partial replacement of the piping
If the pipes are corroded or too narrow, they may need to be replaced. This is a permanent solution and improves the entire network.
6. Installation of pressure booster pump
Ideal when the public water supply pressure is naturally low. A pressurization pump solves the problem throughout the house.
7. Pressure reducer adjustment
In some homes, the pressure reducer may be incorrectly adjusted. A plumber can adjust it to improve water distribution.
Low water pressure in the water heater
Gas water heaters require a minimum pressure to function properly. If there is insufficient pressure:
- The water does not heat up
- The flame repeatedly fails
- The temperature is unstable
In these cases, the problem may be with the water heater, the filters, the piping, or the water pressure itself.
When should you call a professional?
There are situations where a home diagnosis is no longer sufficient. You should call a plumber when:
- Low pressure affects the entire house
- There are signs of leakage inside the wall.
- The faucets continue to have low pressure even after cleaning.
- Pressure affects the water heater
- Suspects that the problem comes from the old plumbing
- Unable to identify the source of the problem
Why choose Canalizador de Lisboa
If you have low water pressure at home, the Canalizador de Lisboa provides rapid diagnosis and definitive solutions. Our team uses detection, measurement, and intervention tools to safely restore pressure.
Our advantages include:
- Fast service in the Lisbon area
- Modern equipment to identify the cause of low blood pressure
- Professional and long-lasting repairs
- Experience with old and modern plumbing
- Availability for emergencies
Conclusion
Low water pressure is a common problem, but with the right diagnosis and appropriate intervention, it can be resolved quickly. From simple adjustments to pipe replacement, there is always an effective solution.
If you want to restore water pressure safely and professionally, count on Canalizador de Lisboa for fast, accurate, and long-lasting service.
