How to Fix a Kitchen Sink Leak the Right Way

A kitchen sink leaking underneath or around the edges is one of the most common (and messiest) problems homeowners face. Even a small drip can lead to water damage, warped cabinetry, or mould growth if ignored.

This blog will walk you through how to identify where the leak is coming from, what typically causes a kitchen sink leak, and the safest way to fix it properly before it turns into a bigger plumbing issue.

Signs Your Kitchen Sink Is Leaking

A leak isn’t always obvious at first. Keep an eye out for these early warning signs:

• Dampness, swelling, or soft spots in your cabinet base
• Musty odours or visible mould near pipes
• Water dripping from fittings or hoses
• Puddles forming underneath the sink after use
• Stains or bubbling along benchtop silicone

If you notice any of these, your kitchen sink leaking problem needs attention before it leads to costly repairs.

Why Is My Kitchen Sink Leaking?

There are several common reasons for a kitchen sink leak, and finding the source is key to fixing it correctly.

1. Worn Seals or Gaskets

Rubber or silicone seals can wear out over time, causing a kitchen sink leaking around edges.

2. Loose Tap or Drain Connections

Vibration and temperature changes can loosen fittings, letting small amounts of water escape unnoticed.

3. Cracked Pipes or Hoses

Tiny cracks in supply lines or trap pipes often lead to a kitchen sink leaking underneath, especially when the tap is turned on.

4. Corroded Sink Strainer

The strainer (the metal basket in the drain) can rust or loosen, causing drips just below the sink basin.

5. Poorly Sealed Sink Rim

If caulk or silicone sealant around your benchtop wears out, water can seep through gaps and damage your countertop.

How to Fix a Kitchen Sink Leak

If you’re wondering how to fix kitchen sink leak problems safely, it’s important to remember that DIY fixes come with risks. Small mistakes like over-tightening fittings or using the wrong sealant can make the leak worse. Here are some simple steps to start with, and when in doubt, it’s always best to call a professional.

1. Turn Off the Water Supply

Switch off both the hot and cold valves under your sink.

2. Inspect the Edges and Drain

Check for water escaping around the edges or through the drain. Re-seal any gaps with waterproof silicone sealant.

3. Tighten Loose Connections

Gently tighten any loose drain or tap fittings with a wrench but don’t overtighten, as this can crack washers or pipes.

4. Replace Worn Seals or Hoses

If you find corrosion or wear underneath the sink, replace the damaged parts with new gaskets, O-rings, or hoses.

5. Test for Leaks

Run water for a few minutes while checking all joints. If the leak continues, there may be a deeper issue that needs professional attention.

Tip: If the leak is inside the wall or cabinetry, avoid DIY repairs, this could cause further water damage. It’s best to call a licensed plumber.

Why Call a Professional Plumber

A kitchen sink leaking underneath can quickly cause water damage to surrounding walls and flooring. Calling a qualified plumber from Water Works ensures the problem is fixed properly the first time.

Our plumbers can:

• Pinpoint the exact source of the leak using specialised tools
• Replace corroded or damaged fittings safely
• Reseal and waterproof the sink area
• Ensure your plumbing meets NZ standards

We handle everything from minor leaks to full sink replacements with guaranteed workmanship and friendly service.

How to Prevent Future Sink Leaks

To help keep your kitchen leak-free:

• Check under your sink every month for moisture or rust
• Reseal around edges every few years
• Avoid harsh chemical cleaners that corrode fittings
• Don’t overload the cabinet with heavy items pressing on pipes
• Schedule regular plumbing maintenance to keep fittings secure

Preventative care is always more affordable than repairing water damage later on.

Auckland’s Trusted Experts for Kitchen Sink Leak Repairs

If you’ve noticed a kitchen sink leaking, don’t wait! Even a small drip can turn into a bigger problem over time.

At Water Works, we specialise in locating and repairing leaks around edges, underneath sinks, and inside plumbing lines. Our licensed plumbers provide quick, reliable service throughout Auckland and nearby areas.

Call us today or book online and save $15. Our 24/7 Emergency Plumbing Services are always ready when you need fast, reliable help.