How to Fix a Leaky Faucet: 5 Quick Fixes Before Calling a Plumber

A dripping faucet is usually a small, inexpensive fix — but it's worth knowing what's actually causing it before you decide whether to DIY it or call a plumber. Here's where to start.

1. Turn Off the Water Supply First

Before touching anything, shut the valves under the sink (or the home's main shutoff if there's no local valve). This is true for any faucet work, DIY or otherwise.

2. Check the Aerator

If the faucet is spraying oddly or seems low-pressure rather than dripping, unscrew the aerator at the tip and clean out any mineral buildup — a common issue with South Bay water.

3. Inspect the Cartridge or Washer

Most modern faucets use a cartridge; older ones use a rubber washer and seat. A worn one is the single most common cause of a persistent drip and is usually a straightforward swap once you have the matching part.

4. Check the O-Rings

If the leak is around the base of the handle rather than the spout, a worn O-ring is often the culprit — inexpensive but fiddly to access on some faucet models.

5. Look Under the Sink for Supply Line Leaks

Sometimes what looks like a faucet leak is actually a loose or worn supply line connection underneath — worth checking before you disassemble the faucet itself.

When to Call a Plumber

If you've replaced the obvious part and it's still dripping, or if the faucet body itself looks corroded, it's time to call. Matching cartridges for specific faucet models can also be tricky to source — something we carry a wide range of on the truck. See our faucet repair page for same-day service in Torrance.

Reviewed by the Rush Plumber team — licensed, insured plumbers serving Torrance, CA and the South Bay, 3610 Torrance Blvd, Torrance, CA 90503. Call (209) 860-5004, 24/7.