Troubleshooting
Low Water Pressure at One Faucet: Causes & Fixes
When pressure is low at just one faucet while the rest of the house is fine, the problem is local to that fixture, most commonly a clogged aerator or a partially closed supply valve. In hard-water Phoenix homes, mineral scale in the aerator or cartridge is the number-one cause. House-wide low pressure is a different problem (PRV, main line, or municipal supply).
What to do right now
- Unscrew the aerator from the faucet tip, soak it in vinegar to dissolve the scale, rinse, and reinstall
- Check both shut-off valves under the sink and make sure they're fully open
- If hot is weak but cold is fine (or the other way around), suspect that side's supply stop, line, or the cartridge.
Likely causes
- Clogged aerator: mineral and debris buildup in the faucet tip, very common with 16-20 grain hard water
- A partially closed angle or supply stop under the sink restricting flow to that fixture
- Scaled or worn faucet cartridge, or a clogged inlet screen on the valve
- Kinked or corroded supply line, or sediment caught after recent water-main work nearby
When to call a pro
If the quick fixes do not solve it, this is usually a faucet & fixture installation job. Liberty dispatches 24/7 with upfront pricing.
Low Water Pressure at One Faucet: Causes & Fixes, FAQ
- Why is only my hot side low pressure?
- A one-side pressure drop usually means that side's supply valve, line, or the cartridge passage is restricted, often by scale or sediment loosened in the water heater. Cleaning the aerator and checking the hot supply stop is the first step.
- Could low pressure at one faucet mean a leak?
- Rarely for a single fixture. An isolated drop is almost always a local clog or valve. But if low pressure spreads to several fixtures, or you see damp spots, that's worth a leak check.
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