Getting a slow trickle when your faucet is on full blast is frustrating. It’s difficult to wash your hands, brush your teeth, or rinse out a sink when the water flow is weak. Fortunately, a single faucet with low water pressure often indicates a local problem, rather than trouble with the entire plumbing system.
You might need to clean your faucet aerator to remove built-up debris. It could be that a nearby shutoff valve is partially closed. With the tips that follow, you can determine whether your faucet needs basic maintenance or a professional faucet repair.
Quick Takeaways
- The most common cause of low water pressure in one faucet is a clogged aerator.
- Faucet cartridges, shutoff valves, and supply lines can cause low water pressure, too.
- If other faucets are working correctly, the problem is likely limited to that fixture.
- Sudden pressure loss could indicate a blockage or a faulty faucet component.
- Professional faucet repair service can quickly find and fix hidden issues.
Start Here: Is the Problem Really Limited to One Faucet
Your main water supply line services your entire home. This pipe carries fresh, potable water into the building. But indoors, it branches into many secondary supply lines that service individual taps and plumbing-connected appliances.
When a single fixture has low pressure, the problem is local. It may be related to the fixture itself or the secondary supply line that services it. When multiple fixtures have low pressure, there could be a problem with the main water supply line, the hot water heater, or a shared, secondary line.
Start by checking nearby faucets. Compare the hot and cold water pressure for each. This will help you determine whether you have a single-fixture issue or one that affects multiple taps.
Common Causes of Low Water Pressure in One Faucet
Most faucets last between 15 and 20 years. But if you have extremely hard water flowing into your home, your faucets could develop low pressure and other problems much sooner. Faucets in high-use areas also sustain greater wear and tear. Check out these common causes of low water pressure in one faucet to learn which issue is affecting yours.
A Clogged Aerator
Faucet aerators are small, mesh-screen devices that screw onto faucet tips. They mix water with air to prevent errant splashes and conserve water. Over time, these devices can develop blockages due to trapped dirt, sediment, and mineral deposits.
To clear a clogged aerator, close or cover the sink drain. This way, small parts won’t fall into the drain when you take the aerator off. Twist the aerator counterclockwise to remove it. If it’s slippery or stuck, you can use a rubber or silicone jar opener for better traction.
Once it’s removed, separate the aerator’s parts. Then, place its flow restrictor, screen, and rubber washer in a small dish of white vinegar for 30 minutes to one hour. This will break down mineral deposits and clear the aerator’s screen.
Reassemble the aerator for reinstallation. Before reinstalling it, turn the tap on and let the water flow for several seconds to flush out any remaining dirt or sediment. Screw the aerator in by turning it clockwise. Test your faucet once more to check for normal pressure.
A Partially Closed Shutoff Valve
Every plumbing fixture in your home should have an accessible shut-off valve. Some fixtures have shared shut-off valves, and sinks have two: one for hot water and another for cold. You can turn these valves during leaks and overflows to mitigate water damage.
It may be that someone used the faucet’s shut-off valve during an emergency, but never fully opened it once the problem was resolved. Sometimes residents make accidental shut-off valve adjustments. These valves don’t just turn water flow on and off. A partially closed valve will inhibit water flow and decrease water pressure at the tap.
Find the hot and cold shut-off valves beneath the sink. To fully open them, turn them counterclockwise until they stop moving.
A Worn or Faulty Faucet Cartridge
Faucet cartridges are internal faucet valves that control the temperature and flow of water. Over time, mineral deposits and other buildups can cause these components to fail. Excessively high water pressure can degrade their rubber seals, and the metal fatigue of normal wear can crack their housing.
If the sink’s shut-off valve is fully open and the aerator is clean, a faulty faucet cartridge is the likely issue. Cartridge failure is a common issue in older faucets. It’s one of the top signs of a need for faucet replacement.
A Kinked or Damaged Supply Line
The water line that services your faucet could be kinked or damaged. This can happen due to faulty installation or faulty repairs. Water line damage can also occur due to sediment buildups, rust formation, and other age and wear-related issues. Check the water supply line for visible kinks or depressions.
There may be damage or supply restrictions behind the drywall or the fixture itself. Hiring a plumber is the best way to identify hidden water delivery problems.
Mineral Buildup Inside the Faucet
Hard water has heavy concentrations of dissolved calcium and magnesium. These hard water minerals leave chalky, white deposits on plumbing fixtures. They also create deposits within them. These buildups narrow water passages so that less water flows through. Interior mineral buildups could be the culprit if your faucet is experiencing gradual losses in pressure.
How to Troubleshoot Low Water Pressure in One Faucet
After comparing water pressure at multiple faucets and determining that the issue is a local one, you can:
- Inspect and clean the faucet aerator
- Check and open the under-sink shut-off valves
- Test both the hot and cold water
- Inspect the water supply lines
If none of these basic troubleshooting measures work, contact a plumber. Even with single-faucet problems, DIY troubleshooting can’t identify and resolve all underlying causes.
When Low Water Pressure Means You Need Faucet Repair
If cleaning an aerator or opening the faucet’s shutoff valve only works for a short time, you need a professional plumber. Other signs that you may need a faucet repair or replacement include:
- Internal faucet damage
- Aging faucets and faucet components
- Leaks near the offending fixture
- Visible corrosion
FAQ
It’s not uncommon to have questions about low water pressure. Fortunately, Niceville Benjamin Franklin has answers. Not only are we the Punctual Plumbers Niceville relies on, but we’re also a trusted source for plumbing information.
Why does only one faucet have low water pressure?
Having low water pressure at only one faucet is a sign of local plumbing problems. The faucet may have a kinked or damaged supply line, a clogged aerator, or aging internal components.
Can a clogged aerator cause low water pressure?
Yes, it can. A clogged aerator restricts water flow. As flowing water encounters mineral build-ups, dirt, and other debris, it slows down.
Why is my hot water pressure low, but my cold water pressure is normal?
Hot and cold water travel two separate paths to your sink. You may have hard water buildups in your water heater that affect the hot water supply to all areas of the home. If you have low hot water pressure at a single sink, the sink may have a partially closed shut-off valve or a kinked or blocked hot water supply line.
Can a bad faucet cartridge reduce water pressure?
Yes, it can. Like aerators, faucet cartridges can develop built-up dirt, sediment, and hard water minerals that restrict water flow. Aging and rusted components can restrict water flow, too.
How do I know if I need faucet repair or replacement?
You should consider replacing your faucet if it’s more than 15 years old. Recurring leaks or pressure issues also indicate the need for replacement. When fixing an old faucet costs more than half the cost of replacement, getting a new faucet is the best choice.
Is low water pressure in one faucet an emergency?
Low water pressure at a single faucet isn’t a true plumbing emergency, but it still warrants immediate attention. Letting minor faucet problems fester could allow them to escalate.
Find and Fix Water Pressure Problems With Benjamin Franklin Plumbing
Don’t let water pressure problems at a single tap fester. If left unchecked, aging faucet components, kinked water supply lines, and other underlying issues could lead to water damage.
Get a fast, accurate diagnosis and a lasting solution with faucet repair service from Benjamin Franklin Plumbing in Niceville, FL. When your faucet trickles instead of flows, our Punctual Plumbers get the water moving again.