Why is there low water pressure only in my bathroom sink?

Low water pressure isolated to one bathroom sink is typically caused by a clogged aerator, partially closed shut-off valves, or mineral buildup in the faucet cartridge. This is usually a localized issue rather than a whole-house problem.

The most common culprit is a clogged aerator - the small screen at the tip of your faucet. Over time, mineral deposits from Ottawa's moderately hard water can block these tiny holes, restricting water flow. Unscrew the aerator (turn counterclockwise) and soak it in white vinegar overnight, then scrub with an old toothbrush to remove buildup.

If cleaning the aerator doesn't help, check the shut-off valves under your sink. These valves control water flow to your faucet and may have been partially closed during previous repairs. Turn them fully counterclockwise to ensure they're completely open. Sometimes these valves can become partially stuck or corroded, especially in older Ottawa homes.

Mineral buildup inside the faucet cartridge is another common issue, particularly with Ottawa's water conditions. If your faucet is several years old, calcium and lime deposits may have accumulated inside the cartridge mechanism. This typically requires disassembling the faucet and either cleaning or replacing the cartridge - a job that varies in complexity depending on your faucet type.

In Ottawa homes, we also occasionally see issues with supply line restrictions where the flexible supply lines under the sink have become kinked or internally damaged. If your bathroom was recently renovated or if someone worked under the sink, these lines may have been disturbed.

Start with the aerator cleaning as it's the easiest fix. If that doesn't resolve the issue and you're not comfortable working with faucet components or shut-off valves, it's time to call a professional. Water damage from loose connections can be costly, and a licensed plumber can quickly diagnose whether it's a simple cartridge replacement or a more complex supply line issue.

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