How to Fix a Leaking Faucet

A leaking faucet is one of the most common household plumbing issues in Canadian homes. Beyond the annoying drip, even a small leak can waste thousands of litres of water each year, adding to your utility bill. The good news is that most faucet leaks are straightforward to repair and can be completed by a homeowner with basic tools in under an hour.

The most frequent cause is a worn-out washer or O-ring inside the faucet handle. Over time, the constant pressure of opening and closing the tap wears these rubber components down. Cartridge-style faucets may develop cracks in the cartridge itself. Mineral buildup from hard water — common across many Canadian municipalities — can also degrade seals and cause dripping.

You'll need an adjustable wrench, flat-head and Phillips screwdrivers, replacement washers or O-rings (CAD $2–$5 at any hardware store), plumber's grease, and a cloth to protect the faucet finish. If you have a cartridge faucet, pick up a replacement cartridge specific to your brand (CAD $10–$25).

1. Turn off the water supply valves beneath the sink.
2. Open the faucet to release any remaining pressure.
3. Remove the handle — look for a hidden screw under a decorative cap.
4. Unscrew the packing nut to expose the stem, then remove the stem.
5. Inspect the washer and O-ring at the bottom of the stem. Replace any that look worn, cracked, or flattened.
6. Apply a thin layer of plumber's grease to the new washer and O-ring.
7. Reassemble in reverse order, tighten snugly, and turn the water supply back on.
8. Test the faucet — the drip should be gone.

If the leak persists after replacing the washer and O-ring, or if you notice corrosion on the valve seat, it's time to call a licensed plumber. Corroded valve seats require specialised reseating tools. If the faucet body itself is cracked, replacement is the only option — a professional can ensure proper installation and test for leaks.