Start with the aerator and shut-off valve
The fastest fix for low kitchen sink pressure is cleaning or replacing the aerator — the small screen at the tip of your faucet. Mineral deposits and debris collect there and restrict flow. Unscrew it by hand (turn counterclockwise), rinse it under hot water, and use an old toothbrush to scrub away buildup. If it is heavily corroded, buy a replacement aerator at any hardware store for $3 to $8 and screw it back on.
Next, check the shut-off valve under your sink. This valve controls water flow to the faucet. If someone partially closed it, your pressure will drop. Look under the sink for two small knobs or levers on the supply lines (usually one for hot, one for cold). Turn them fully counterclockwise until they stop. If the valve is stuck or will not turn, do not force it — a stuck valve often means it needs replacement, which a plumber can do in under an hour.
Key Takeaways
- A clogged aerator is the most common cause of low kitchen sink pressure and takes five minutes to clean.
- The shut-off valve under your sink may be partially closed; turn it fully counterclockwise to restore full pressure.
- If pressure is low everywhere in your home, the issue is likely in your main supply line or water meter, not the sink itself.
- A pressure regulator that has failed will reduce pressure throughout your home and requires a plumber to replace.
Check whether the problem is only at your sink
Before you spend money on repairs, determine whether low pressure is isolated to your kitchen sink or affects your whole home. Turn on the bathroom sink, shower, and outdoor hose. If those have normal pressure, the problem is specific to your kitchen faucet — likely the aerator or the shut-off valve you just checked.
If pressure is low everywhere, the issue is upstream: in your main water supply line, at your water meter, or in your pressure regulator. These require a plumber to diagnose and repair. Call your water utility first to ask whether they have detected any main breaks in your area; if not, the problem is on your side of the meter.
Clean the faucet inlet screen
Some faucets have a second screen inside the faucet body, behind where the aerator screws on. If cleaning the aerator did not help, this inlet screen may be clogged. Turn off the shut-off valves under the sink, then unscrew the aerator completely. Look into the opening with a flashlight. If you see a small mesh screen, use a thin wire or straightened paperclip to gently dislodge debris, then flush the opening with hot water from a cup.
Do not poke hard or you may damage the valve seat inside. If the screen is heavily corroded or you cannot remove debris, the faucet cartridge itself may need replacement. This is a $40 to $150 job depending on your faucet brand, and a plumber can do it in 30 to 45 minutes.
Replace the faucet cartridge or valve
If the aerator and inlet screen are clean and the shut-off valve is fully open, the problem is inside the faucet. Most kitchen faucets use a cartridge — a replaceable part that controls water flow and temperature. Over time, mineral deposits build up inside the cartridge and restrict flow.
You can buy a replacement cartridge for $15 to $40 at a hardware store, but you need to know your faucet brand and model. Look under the sink for the brand name stamped on the faucet body, or search online for "kitchen faucet cartridge replacement" plus your brand. Installation usually takes 20 to 30 minutes if you follow the manufacturer's instructions. If you are not comfortable taking apart the faucet, a plumber can do it for $100 to $200 including the cartridge.
Inspect supply lines for kinks or damage
The flexible hoses that carry water to your faucet can kink, pinch, or develop internal blockages. Look under your sink at both the hot and cold supply lines. If either hose is kinked, straighten it gently. If a hose is cracked, leaking, or has a visible dent, it needs replacement — buy a new braided stainless steel supply line for $8 to $15 and screw it on by hand (turn clockwise).
If the hoses look fine but pressure is still low, the problem may be inside the hose — a partial blockage you cannot see. Disconnect the supply line at the faucet inlet (have a bucket ready for water), and turn on the shut-off valve to see if water flows freely from the hose. If it does not, the hose is blocked and needs replacement.
Check your water pressure regulator
Homes with municipal water service often have a pressure regulator — a bell-shaped device on the main water line where it enters your home. This device keeps pressure from the street from damaging your pipes. If the regulator fails, pressure throughout your home drops.
You can buy an inexpensive pressure gauge at a hardware store and screw it onto an outdoor hose bib to measure your incoming pressure. Normal household pressure is 40 to 60 pounds per square inch (psi). If your gauge reads below 40 psi and pressure is low everywhere in your home, the regulator has likely failed. Replacement costs $300 to $500 and requires a plumber, but it is a straightforward job.
When to call a plumber
Call a plumber if the aerator is clean, the shut-off valve is fully open, and pressure is still low only at your kitchen sink. You likely need a cartridge replacement or faucet repair, which takes 30 minutes to an hour. If pressure is low everywhere in your home, call a plumber to check your pressure regulator and main supply line — these issues cannot be fixed without professional tools and knowledge.
Most plumbers charge $100 to $150 for a service call plus the cost of parts. Get a quote before work begins. If your faucet is very old (more than 15 years), replacing it entirely may cost less than repairing the cartridge, and you will get a modern faucet with better flow and efficiency.
Frequently Asked Questions
Can I increase water pressure by adjusting something at the meter?
No. Your water meter is owned and sealed by your utility company. You cannot legally open or adjust it. If you suspect a problem at the meter, contact your water utility and ask them to inspect it.
Will a new aerator give me higher pressure than the original?
A new aerator will restore pressure to what it was when your faucet was new, but not increase it beyond that. If you want higher flow, you can buy a low-flow aerator replacement (2.0 gpm instead of 2.2 gpm) or remove the aerator entirely, though this wastes water and may void your faucet warranty.
What if only the hot water pressure is low?
The problem is likely in your hot water line or water heater. Check the shut-off valve for the hot water supply under your sink — it may be partially closed. If it is fully open, your water heater may have sediment buildup inside, which restricts flow. A plumber can flush your water heater for $150 to $300.
How do I know if my pressure regulator is failing?
A failing regulator causes low pressure throughout your home, not just at one sink. You may also hear a hissing sound near the regulator or see water dripping from a small relief valve on the device. If you suspect regulator failure, measure your incoming pressure with a gauge. Pressure below 40 psi indicates a problem.
Is low water pressure a sign of a leak?
Not always. A leak would usually show up as water pooling under your sink or in your walls. Low pressure alone is more often a clogged aerator, closed valve, or failed cartridge. However, if you notice both low pressure and a sudden spike in your water bill, a hidden leak is possible and you should call a plumber to locate it.