Quick Answer:
The spray is most likely blocked at the aerator or spray head. Remove the aerator or spray head, inspect for a mineral ring, soak and brush it, then reinstall. If the spray still splatters, the valve cartridge or the sprayer assembly may need cleaning or replacement. If other taps show poor flow, check those fixtures separately — see Pressure fluctuates at one tap only and Outdoor spigot has weak pressure for different problems.
Why This Happens
Small holes in aerators and spray heads collect mineral deposits (calcium or lime) from hard water. Over time those deposits change the flow pattern so water shoots unevenly or splatters. This is a local blockage at the fixture, not a whole-house pressure drop, so the fix is usually at the aerator, spray head, cartridge, or pull-out sprayer hose.
Step-by-Step What to Do
Tools and quick checks
- Soft cloth, old toothbrush or small nylon brush
- Small bowl, white vinegar or a household descaling solution
- Pliers with cloth or an adjustable wrench (to protect finishes)
- Towel or rag to catch small parts
Quick check: turn on another tap briefly. If other taps spray normally, this is a fixture-level issue.
Remove the aerator or spray head
- Close the sink drain to avoid dropping parts down the drain.
- Unscrew the aerator or spray head by hand. If stuck, wrap it with a cloth and use pliers gently — don’t chew the finish.
- Keep note of any small parts or screens you remove so you can reinstall them the same way.
Inspect for a mineral ring
- Look for white or brown crusty buildup around the holes or inside the screen.
- If the screen or diffuser is clogged, it will be obvious as deposits blocking the holes.
Soak and brush
- Place the aerator parts in a bowl of white vinegar for 15–30 minutes to dissolve deposits. Stronger buildup may need longer.
- Use a soft brush or old toothbrush to scrub away loosened mineral grit. Rinse thoroughly with water.
- For stubborn spots, repeat soaking rather than using harsh tools.
Reinstall and test
- Reassemble the aerator or spray head parts in the correct order and screw them back onto the faucet by hand.
- Turn the water on and test the pattern. If normal, you’re done.
If spray is still uneven: clean or replace cartridge or sprayer assembly
- For single-handle faucets, the problem may be the cartridge. Turn off the water, remove the handle and trim, then remove and inspect the cartridge for debris or buildup. Flush the valve body with water and replace the cartridge if damaged.
- For pull-out or pull-down sprayers, detach the sprayer head and check the hose and check valve. Mineral buildup inside the head or the inline check valve can disrupt flow. Clean or replace the sprayer head or hose assembly as needed.
- If unsure how to remove the cartridge or sprayer safely, see the manufacturer’s instructions or move to the When to Call a Professional section below.
What Not to Do
- Don’t poke the spray holes with metal pins—enlarging jets can permanently ruin the spray pattern.
- Don’t force chrome or plated parts with pliers without a protective cloth; you can scratch or damage the finish.
- Avoid harsh chemical descalers on finishes unless the product is specifically safe for your fixture.
When to Call a Professional
- If you remove the cartridge or sprayer and find corrosion or internal damage, call a plumber to replace parts correctly.
- If the faucet leaks after reassembly or you can’t shut off the water fully, get professional help to avoid water damage.
- If multiple fixtures show weak or fluctuating pressure after these fixes, a plumber can check valves and supply lines safely.
Safety Notes
- Always shut off the water supply before disassembling internal faucet parts.
- Protect finishes by wrapping jaws with a cloth when using pliers or a wrench.
- Use vinegar or mild descalers in well-ventilated spaces and avoid mixing cleaners.
Common Homeowner Questions
- Why did this start suddenly? Mineral buildup can reach a tipping point where holes are partially blocked, causing a sudden change in spray pattern.
- Can I prevent it? Periodically remove and soak the aerator or spray head to keep mineral deposits from building up.
- Is this a sign of low house pressure? No—uneven spray from one fixture is usually a local blockage, not whole-house low pressure.
For more related articles, see the Low Pressure at Single Fixture hub.