If your faucet leaks from the spout, handle, or base, it’s more than just annoying — it can waste water and get worse over time. Faucet leaks are common and usually caused by worn internal parts rather than a major plumbing failure.
In most cases, the fix involves replacing or tightening a small component.
Quick Answer:
A faucet leaks because internal seals or components have worn out or loosened. This is most often caused by a damaged washer, worn O-ring, faulty cartridge, or loose connections inside the faucet.
Why This Happens
Faucets have moving parts that seal water under pressure. Over time, normal use causes those seals to wear, harden, or shift out of place.
Common causes include:
- Worn washers or O-rings
- A damaged or failing cartridge
- Loose internal fittings
- Mineral buildup inside the faucet
- Aging faucet components
A general leak is different from a faucet that drips after you turn it off, which is a more specific symptom with slightly different causes.
Step-by-Step: How to Diagnose a Leaking Faucet
Step 1: Identify Where the Leak Is Coming From
Watch the faucet closely.
Leaks may appear:
- From the spout
- Around the handle
- At the base of the faucet
Where the leak appears helps narrow down which part is failing.
Step 2: Check the Handle Area
If water leaks when you turn the faucet on or off, the problem is often:
- A worn O-ring
- A loose handle assembly
Leaks around the handle are common and usually easy to fix.
Step 3: Inspect the Faucet Base
Water pooling at the base can be caused by:
- Loose mounting hardware
- Worn seals under the faucet
- Internal leaks dripping downward
This can be mistaken for a sink leaking underneath, so it’s important to confirm the source.
Step 4: Consider Internal Wear
If the faucet leaks from the spout even when fully off, internal components like cartridges or washers may be worn.
This is especially common in older faucets or those exposed to hard water.
Step 5: Check for Mineral Buildup
Mineral deposits can prevent parts from sealing properly.
If buildup is visible:
- Cleaning may help temporarily
- Worn parts often still need replacement
What Not to Do
- Don’t ignore a slow leak
- Don’t overtighten handles or fittings
- Don’t assume a leak will stop on its own
- Don’t replace the entire faucet immediately
Most leaks are caused by inexpensive, replaceable parts.
When to Call a Professional
Call a plumber if:
- The faucet leaks after parts are replaced
- The faucet body is cracked
- You can’t identify the leak source
- Leaks are causing cabinet or floor damage
Some faucets require specialized parts or tools.
Safety Notes
- Shut off water before disassembling the faucet
- Cover the drain to avoid losing small parts
- Keep towels nearby for spills
- Test for leaks after reassembly
Common Homeowner Questions
Can a leaking faucet increase my water bill?
Yes. Even slow leaks can waste a significant amount of water over time.
Is a leaking faucet hard to fix?
Most fixes are straightforward if you can access replacement parts.
Should I replace the faucet instead of repairing it?
Only if repairs fail or parts are unavailable. Repairs are usually cheaper.