How to Spot and Fix Kitchen Sink Leaks
A leak under your kitchen sink might not seem like a big deal-until it causes warped cabinetry, musty smells, or mould you didn’t know was growing. These under-sink leaks can go unnoticed for weeks, quietly damaging your kitchen. The good news? If you catch them early, they’re usually easy to fix.
At SWR Plumbing, we’ve helped homeowners across Melbourne spot and stop under-sink leaks before things got out of hand. Here’s what to look for, what causes these leaks, and when it’s time to call in a pro.
Why Kitchen Sink Leaks Happen More Than You Think
Your kitchen sink is more than just a place to rinse veggies or stack dishes. Underneath, you’ve got water supply lines, drainpipes, taps, maybe a dishwasher connection crammed into one tight spot. Over time, any of these connections can wear out, shift, or fail.
To make it worse, the space under the sink often becomes a storage zone for cleaning products, bins, or pet food. That clutter can block your view and hide early warning signs of a leak- until the damage is already done.
Telltale Signs of a Leak Under the Sink
If you know what to look for, you can often catch a leak early. Here are some of the most common signs:
- A musty or damp smell when you open the cabinet
- Swollen, soft, or warped cabinet flooring
- Brown or yellow water stains at the back or base of the cupboard
- Visible moisture, droplets, or puddles near the pipes
- Mould or mildew growing in the corners
- Rust forming on pipe fittings or drain components
Even a small leak can lead to mold growth or structural damage over time, so don’t ignore these signs.
What Usually Causes Leaks Under the Sink?
Leaks under the kitchen sink usually come from a few common sources:
Loose or cracked drainpipes
The curved P-trap or other drain components can loosen or crack over time-especially if they’ve been bumped by bins or stored items.
Worn-out sink strainer
This is the metal piece that connects the drain to your pipes. The seal around it can wear out, letting water trickle down into the cabinet.
Faulty water supply hoses
Hot and cold water lines connected to the tap can develop leaks where they attach to the shut-off valve or tap. Old, flexible hoses can also split with age.
Leaky tap base
Sometimes the water isn’t leaking underneath’s seeping down from the top. Water can drip around the base of the tap and end up inside the cabinet.
Dishwasher hose issues
If your dishwasher connects under the sink, the inlet or drain hose could be loose, cracked, or corroded.
Suspect a Leak? Here’s What to Do
First, remove anything stored under the sink so you can get a clear look. Use a torch or your phone’s flashlight to check around pipes, hoses, and fittings for moisture or stains. Then, run the tap and let the water drain while watching closely for drips.
If you notice a small leak from a fitting or connection, you can try gently tightening it. Be careful with plastic parts-overtightening can crack them. Replacing worn washers or supply hoses is also a good DIY fix, as long as you’re confident doing it.
But if the leak isn’t obvious, if water keeps coming back, or if you’re just unsure-it’s safest to call in a licensed plumber.
Why Call SWR Plumbing?
We don’t just stop the leak- we find the cause. At SWR Plumbing, we use moisture detection tools and camera inspections to locate hidden leaks without damaging your kitchen. Whether it’s a minor fix or a pipe replacement, we’ll get it done fast and properly.
Our plumbers are fully licensed, experienced, and local. We show up on time, get the job done right, and leave your home clean and dry.
Tips to Avoid Future Under-Sink Leaks
- Check under your kitchen sink once a month
- Replace flexible water hoses every 5 to 10 years
- Avoid stuffing the cupboard with heavy or oversized items
- Install a leak detection sensor-especially if you’ve had issues before
- Use licensed professionals for plumbing installations and repairs
A Drip Today Could Cost You Tomorrow
Leaks don’t fix, and they rarely stay small. If you’ve noticed a damp smell, water damage, or anything suspicious under your kitchen sink, don’t wait.
Visit SWR Plumbing to book your kitchen leak inspection
Protect your cabinets, your flooring, and your peace of mind. Catch the leak before it becomes a flood.