Tap Leaking From the Base: Causes, Checks & Fixes

Isolate the hot and cold supplies before dismantling a tap

Use local service valves or the main stopcock. Do not force seized valves or tap handles. Keep water away from sockets and appliances, and stop if a cracked tap body, failed flexi hose or uncontrolled leak is present.

MOST LIKELY CAUSES

Start with these

Body O-ring failure Seals around the spout or body may have flattened.

Cartridge seal leak Water can escape around the valve body.

Loose retaining ring Movement allows seals to lose compression.

Leak from handle above Water may track down and appear at the base.

◫ Symptom variations Match the exact tap behaviour before repair. ⌄

Water appears when tap is running
Leak follows spout movement
Base remains wet after use
Water emerges beneath handle
Tap body feels loose

✓ Quick checks Simple checks before removing tap parts. ⌄

Identify whether the fault affects hot, cold or both supplies.
Dry the tap and surrounding area to trace leaks accurately.
Check local isolation valves, flexible tails and visible connections.
Remove and inspect the aerator where flow is poor.
Do not force stiff handles, valves or seized fittings.

If the cause is found: keep the affected supply isolated until the correct repair is completed.

If the leak cannot be controlled: close the main stopcock and call a plumber.

1 Step 1 — Dry and observe the tap Isolate water supplies before dismantling tap components. ⌄

Process

Wipe the body and base completely dry, then operate each side separately.

Success looks like: The true leak path becomes visible.

Escalate when: Water may be tracking from higher up.

2 Step 2 — Check whether the tap body moves Isolate water supplies before dismantling tap components. ⌄

Process

Gently test for looseness without forcing it.

Success looks like: A mounting or retaining fault is identified.

Escalate when: Do not keep using a severely loose tap.

3 Step 3 — Isolate before replacing seals Isolate water supplies before dismantling tap components. ⌄

Process

Close the supplies and relieve pressure.

Success looks like: The tap can be dismantled safely.

Escalate when: If fittings are inaccessible or corroded, call a plumber.

⌁ Common causes explained Why taps drip, seize, leak or lose flow. ⌄

Water at the base of a tap can come from worn body O-rings, cartridge seals, a leaking swivel spout, loose retaining parts or water tracking down from the handle.

Tap faults often come from small internal seals, cartridges, washers and local restrictions. Water can also track down the tap body and appear under the sink away from the true source.

⌘ Advanced diagnostics Plumber-level checks and repair work. ⌄

Replace spout and body O-rings.
Replace cartridge seals or cartridge.
Tighten or replace retaining hardware.
Check tap body for cracks.
Reassemble and test through full spout movement.

▣ Parts that may need replacing Common components linked to this fault. ⌄

O-ring kit
Ceramic cartridge
Retaining ring
Tap fixing kit
Complete tap if body is cracked

! When to call a plumber Conditions that should end basic troubleshooting. ⌄

The local isolation valves will not close or are leaking.
A flexible hose is bulging, split or corroded.
The tap body or pipe connection is cracked.
The tap is heavily corroded or inaccessible.
A thermostatic or pressure-balance fault creates a scalding risk.
The leak or poor flow remains after basic service work.

? Frequently asked questions Common questions about tap faults. ⌄

How do I know whether the tap uses a washer or ceramic cartridge?

Traditional screw-down taps usually use washers. Quarter-turn and many lever taps use ceramic cartridges.

Can I replace a cartridge with any similar-looking one?

No. Height, diameter, spline count and inlet layout must match.

Why is only one side of a mixer tap weak?

That side may have a partly closed valve, blocked hose, inlet filter or cartridge passage.