Leaking Tap Repair: When To Call A Plumber

A single dripping tap can waste thousands of litres of water a year, yet most people ignore it because it seems too minor to worry about. That's exactly the problem. What starts as an occasional drip often points to a worn part inside the tap that will only get worse with time. Leaking tap repair isn't just about stopping an annoying sound at 2am, it's about protecting your fixtures, your water bill and the plumbing behind your walls. Understanding what causes a tap to leak, and why the fix isn't always as simple as it looks, can save you money and a fair bit of frustration down the track.

A leaking tap might seem like a small inconvenience, but the underlying cause is usually mechanical wear that won't resolve on its own. Taps are made up of several small components working together to control water flow, and once one part degrades, pressure and moisture start finding their way through gaps that shouldn't exist. Left unchecked, this can lead to water pooling under the sink, damage to cabinetry or even mould developing in damp, hidden spaces.

Common signs it's more than a minor drip include:

Water pooling around the base of the tap
A constant, steady drip rather than an occasional one
Difficulty turning the tap on or off smoothly
Rust or mineral staining near the fixture

Traditional compression taps rely on a rubber washer to create a watertight seal each time the tap is closed. Over years of use, that washer hardens, cracks or flattens, allowing water to seep past even when the tap is fully shut. It's one of the simplest parts to replace, but getting the right size and material for your specific tap model matters more than most people expect.

A few things that speed up washer wear include:

High water pressure in the home
Grit or sediment in the water supply
Age of the tap and how often it's used
Over-tightening the tap when turning it off

If water is escaping from around the tap handle rather than the spout, a worn O-ring is often to blame. This small rubber ring sits inside the tap body and stops water from leaking out where the handle connects to the stem. O-rings deteriorate with heat, age and constant movement, and once they perish, no amount of tightening the handle will stop the seepage.

Signs an O-ring may be the issue:

Dampness around the tap handle, not the spout
Water appearing when the tap is turned rather than left running
A handle that feels loose or wobbly

Most contemporary mixer taps use a cartridge system rather than a traditional washer, and when that cartridge fails, the tap can drip constantly or become difficult to control. Cartridges regulate both water flow and temperature, so a fault here sometimes causes leaking and inconsistent hot or cold mixing at the same time. Because cartridge designs vary significantly between brands, sourcing the correct replacement is often the trickiest part of the job.

Cartridge issues generally show up as:

Dripping regardless of how tightly the tap is closed
Temperature suddenly changing when the tap is adjusted
A stiff or unresponsive handle

The valve seat connects the tap to the spout, and over time, mineral deposits from hard water can cause corrosion around this area. Once corroded, the connection between the washer and the seat is no longer smooth, which leads to a slow but constant drip that a new washer alone won't fix. This is one of the less obvious causes of a leaking tap, and it's often only picked up during a proper inspection.

ndicators of valve seat corrosion include:

Leaking persists after washer replacement
Visible pitting or discolouration inside the tap
A gritty texture felt when the tap is dismantled

It's easy to underestimate how much a slow leak adds up over a full billing cycle. A tap dripping once per second can waste well over 10,000 litres a year, and that's before factoring in the cost of hot water if it's a hot tap. Beyond the bill, ongoing moisture around fittings and cabinetry can eventually cause swelling, staining or structural damage that's far more expensive to repair than the original tap.

The financial and physical impact typically includes:

Noticeably higher water bills over time
Water damage to benchtops or cabinetry
Increased hot water usage and energy costs
Potential mould growth in enclosed spaces

A proper leaking tap repair involves more than swapping a part and hoping for the best. A licensed plumber will assess the tap type, check the condition of the washer, O-ring, cartridge and valve seat, and test water pressure to rule out a broader issue. This step-by-step approach means the actual cause gets fixed, rather than masking a symptom that reappears a few months later. A leaking tap is one of the most common call-outs we get, and it's worth reading How Licensed Plumbers Resolve Common Plumbing Problems to see what else our team handles.

A thorough assessment usually covers:

Identifying the tap type and manufacturer
Testing all internal components for wear
Checking water pressure and supply lines
Confirming the fix resolves the root cause

Tap designs vary enormously between brands, ages and styles, which means a fix that works for one tap can damage another. It's common for DIY attempts to strip threads, crack internal housings or use the wrong replacement part, turning a simple drip into a bigger job that costs more to put right. Any licensed plumber in Bathurst can assess whether a repair or full replacement is the smarter option, based on the tap's condition and age rather than guesswork.

Reasons DIY repairs commonly go wrong include: