You turn on your kitchen or bathroom sink expecting a strong, steady stream. Instead, you get a pathetic trickle. When you have faucet low water pressure but flow is fine everywhere else, frustration sets in fast. Simple tasks like washing hands or doing dishes take forever.
The good news? When you have low water pressure one faucet at a time, it’s almost always a clog or blockage at that faucet. It rarely signals a major plumbing issue. With a little investigation, you can often pinpoint and fix the problem yourself.
At Repipe Solutions Inc., we’ve seen every type of faucet failure. This guide covers the four most common culprits behind weak water flow.
1. A Clogged Faucet Aerator (The #1 Cause)
A clogged faucet aerator is by far the most frequent reason for sudden flow drops. The aerator is the small, screw-on screen at your faucet tip. It mixes air with water to create a smooth, splash-free stream.
Over time, mineral deposits, sediment, and debris clog this fine mesh screen. As the screen blocks up, less water passes through. Your kitchen faucet low flow problem gets worse each week.
How to Fix It:
- Unscrew the aerator by turning counter-clockwise. If stuck, wrap it with cloth and use pliers to loosen.
- Disassemble and inspect. Note the order of small screens and rubber washers inside.
- Scrub parts with an old toothbrush. For stubborn mineral buildup, soak in white vinegar for a few hours.
- Rinse all parts thoroughly. Before reinstalling, turn on the faucet briefly to flush loose debris.
- Screw the aerator back on. Your water flow should return to full power.
2. A Clogged Faucet Cartridge
If cleaning the aerator doesn’t help, check the faucet cartridge next. The cartridge is the internal valve controlling water flow and temperature when you move the handle.
Sediment and hard water deposits can clog the cartridge’s small inlet and outlet ports. This restricts water before it even reaches the spout.
How to Fix It:
Replacing a faucet cartridge is more involved but still manageable for many homeowners. Shut off the water supply under the sink first. Remove the faucet handle, then use a wrench to extract the old cartridge. Bring it to a hardware store to find an exact match for your faucet make and model.
3. A Partially Closed Faucet Shut Off Valve
Underneath your sink, two small valves control water flow to your faucet. One handles hot, one handles cold. These are called faucet shut off valves or “stops.”
Someone may have accidentally bumped a valve partially closed. This restricts flow to the faucet immediately.
How to Check It:
Look under the sink and check both valve handles. Turn them fully counter-clockwise to the “on” position. Older gate-style valves can fail internally. The washer comes loose and blocks flow even when the handle appears open. A plumber must replace these faulty valves.
4. Kinked or Clogged Supply Lines
Flexible supply lines connect shut off valves to your faucet. These lines can kink in crowded under-sink cabinets. A sharp kink acts like a closed valve and severely restricts flow. Supply lines also clog with sediment over time.
How to Check It:
Inspect supply lines for kinks or sharp bends. To check for clogs, shut off water and disconnect the line from the faucet. Point it into a bucket and briefly turn water on. Good flow from the line means the clog is elsewhere.
When to Call a Professional
Cleaned the aerator and checked the shut off valves but still have a trickle? The problem is likely a clogged cartridge or supply line. Many homeowners can tackle these repairs, but you may prefer professional help.
The experts at Repipe Solutions Inc. quickly diagnose the cause of your faucet low water pressure. We clean or replace cartridges, clear supply lines, and restore full flow. If your faucet is old and worn out, we help you select and install an efficient new one.
Contact us today to get your faucet running at full power again!
