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Kitchen Faucet Whistling? Check the Aerator Before the Cartridge

A whistle usually means water is squeezing through a clogged or worn aerator. Clean it first, then replace it if the whistle returns.

By Jamilur Rahman Updated November 5, 2026 · 6 min read

Time
15 min
Cost
Under $20
Difficulty
Easy
A kitchen faucet spout with its aerator unscrewed on a folded towel, showing small mineral flecks on the mesh screen
In this guide
  1. Quick answer
  2. Free vs. permanent fix
  3. What you'll need
  4. Why it happens
  5. Try this first (free)
  6. When free fixes aren't enough
  7. Buy the fix
  8. Find the cause in two minutes
  9. Put the aerator back correctly
  10. What to skip
  11. FAQ
  12. Related problems

Quick answer

Why does a kitchen faucet whistle? Water is being forced through a space that is too small, most often a clogged or worn aerator, sometimes a partly closed shutoff valve or a worn cartridge. Unscrew the aerator, soak it in vinegar, rinse, and put it back. If it still whistles, fresh washers or a new aerator are cheap fixes. Check the cartridge last.

Free fix vs. permanent fix

Free fix · 15 minutes

Clean the aerator and open the valves

  • Unscrew the aerator by hand, or with a cloth and pliers
  • Soak it in white vinegar for 30 minutes and brush the screen
  • Check that both shutoff valves under the sink are fully open
  • Rinse, refit, and run the faucet at several flow levels

How long it lasts: Months, if the cause was mineral buildup. A worn mesh or cracked washer will whistle again after a few weeks.

Most readers choose Permanent fix
Faucet aerator and washer repair set with removal key (illustration)
Illustration

A new aerator and washer set that matches your faucet

Aerators have small rubber washers and fine mesh that wear out, crack, or clog with minerals. Cleaning the old one buys time, but a damaged washer lets water jet past and whistle. A matching new set restores the original flow.

What to get: Faucet aerator and washer repair set with removal key

How long it lasts: Years. Fresh washers seal tightly and a clean mesh passes water evenly.

Check price on Amazon

As an Amazon Associate I earn from qualifying purchases.

What you'll need

  • Soft cloth

    Wrap it around the aerator so pliers do not scratch the finish

    You have it

  • Adjustable pliers

    Only for a stuck aerator

    You have it

  • White vinegar and old toothbrush

    Dissolves mineral crust on the mesh

    Free
  • Our pick
    Faucet aerator and washer set with key (illustration)
    Illustration

    Faucet aerator and washer set with key

    The best way to match thread size and the washers

    Check price
  • Replacement faucet cartridge (illustration)
    Illustration

    Replacement faucet cartridge

    Only if the aerator is not the cause

    Check price

Why it happens

1

A clogged aerator screen

Hard water leaves mineral scale on the fine mesh, and sand or pipe debris can block it. Water has less room to pass, speeds up, and whistles at the end of the spout.

2

A worn or cracked aerator washer

The rubber washer inside the aerator seals the space around the mesh. When it hardens or cracks, water jets around it and sings.

3

A shutoff valve that is only partly open

Water shut off under the sink, then turned back on only part way after a repair, creates a narrow gap and a whistle at the faucet.

4

A worn cartridge or valve seat

Inside single-handle faucets, a cartridge that is old or scored can whistle when the handle is only partly open. Fix the aerator first, because this is the rarer cause.

5

High household water pressure

If every faucet in the house whistles, the pressure may be too high. A plumber can check it with a gauge and adjust the pressure regulator.

Try this first (free)

Do these in order, starting with the simplest.

  1. Test when it whistles

    Open the handle slowly and note where the whistle starts. Whistling only at partial flow suggests a restricted aerator or a valve problem. A whistle at every setting points to the aerator or a worn washer.

  2. Check the shutoff valves under the sink

    Turn both angle valves counterclockwise until they stop. If one was left half closed after a repair, opening it can end the whistle at once.

  3. Unscrew the aerator

    Tool used: Soft cloth

    Turn it counterclockwise by hand. If it is stuck, wrap it in a soft cloth and use pliers gently. Some spouts hide the aerator inside, and you need a small key.

  4. Soak and scrub the parts

    Tool used: White vinegar and old toothbrush

    Take the washer, screen, and housing apart and lay them in white vinegar for 30 minutes. Scrub the mesh with an old toothbrush, rinse everything, and check that the rubber washer is still soft and flat.

  5. Replace the washer or the aerator

    Tool used: Faucet aerator and washer set with key

    If the washer is cracked or the screen is bent, fit a new set. Bring the old aerator to the store or check the thread size on its edge so the new one matches.

    Faucet aerator and washer set with key (illustration)
    Illustration

    Tool for this step

    Faucet aerator and washer set with key · The best way to match thread size and the washers

    Check price on Amazon

When free fixes aren't enough

If the faucet still whistles with a clean, new aerator and open valves, the problem is deeper. A cartridge that is old or damaged will whistle when the handle is only partly open. Shut off the water under the sink before you open the faucet body, and match the replacement to your faucet's make and model. If every faucet in the house whistles, or you also hear banging pipes, call a plumber to check the water pressure. Never force a stuck aerator, since the spout can crack.

Buy the fix

Still stuck after the free fixes? These are the products we would look at.

Our picks compared
PickProductFixesWho it's forBuy
Best pick
Faucet aerator and washer repair set with removal key (illustration)
Illustration
Faucet aerator and washer repair set with removal key
whistling caused by a clogged or worn aerator Anyone whose cleaned aerator still whistles, or whose aerator is cracked or old. Check price
Upgrade pick
Replacement faucet cartridge (illustration)
Illustration
Replacement faucet cartridge
a whistle that stays after the aerator is clean or replaced Owners of single-handle faucets that whistle only at partial handle positions. Check price
Best pick
Faucet aerator and washer repair set with removal key (illustration)
Illustration

Faucet aerator and washer repair set with removal key

Fixes: whistling caused by a clogged or worn aerator

Look for: A thread size and type (male or female) that match your spout; Several rubber washers and a spare screen in the set; A removal key for spouts with a hidden aerator.

Who it's for
Anyone whose cleaned aerator still whistles, or whose aerator is cracked or old.
Honest downside
You have not checked the thread size. Measure or look at the edge of your aerator first.
Check price on Amazon
Upgrade pick
Replacement faucet cartridge (illustration)
Illustration

Replacement faucet cartridge

Fixes: a whistle that stays after the aerator is clean or replaced

Look for: An exact match for your faucet make and model; A single cartridge with its O-rings and a seal included; Clear install instructions in the listing.

Who it's for
Owners of single-handle faucets that whistle only at partial handle positions.
Honest downside
You do not know your faucet brand or model. Cartridges are not universal, and the wrong one will not fit.
Check price on Amazon

As an Amazon Associate I earn from qualifying purchases. We don't show prices because they change, so use the button to see today's price.

How we picked: How we picked: this page is based on faucet manufacturer care guides, plumbing repair basics, and the problems and fixes owners report in reviews. We do not test products by hand.

Find the cause in two minutes

  • Whistles at the kitchen faucet only, at all settings: the aerator.
  • Whistles only when the handle is barely open: the aerator or the cartridge.
  • Whistled after a recent repair: a shutoff valve not fully open.
  • Every faucet whistles: the house water pressure.

Put the aerator back correctly

Lay the parts out in order as you take them apart, then reassemble in reverse: washer, screen, housing. Screw it on by hand until snug, then give it a gentle quarter turn with the cloth and pliers. Over-tightening can crack the plastic and cause a drip or a new whistle.

What to skip

Swapping the whole faucet right away

A new faucet costs far more than an aerator set and can whistle too if the cause is a valve or pressure. Start at the spout and work backward: aerator, shutoff valves, cartridge. Replace the faucet only if parts are worn out or no longer sold.

Frequently asked questions

Why does my kitchen faucet whistle?
Water is squeezing through a narrow gap. The most common cause is a clogged or worn aerator, then a partly closed shutoff valve, then a worn cartridge. Check them in that order.
Why is my kitchen faucet whistling only when I turn it on slowly?
At partial flow, a restricted aerator or a worn cartridge can make a high-pitched sound. At full flow, the water speeds past it. Clean the aerator first and open the shutoff valves fully.
How do I find the right aerator size?
Look for a size marked on the edge of the old aerator, or take it to a hardware store. Common sizes are a regular and a smaller junior size, and the thread can be on the outside (male) or inside (female).
Can I clean the aerator without taking the faucet apart?
Yes. Unscrew the aerator from the spout tip, clean it, and screw it back. You do not need to open the faucet body or turn off the water for this step.

As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure

Faucet aerator and washer repair set with removal key (illustration)
Illustration

Our pick: Faucet aerator and washer repair set with removal key

Check price