You’ve replaced the washer, tightened the fittings, and yet the tap still leaks. It’s frustrating, isn’t it? A leaking tap after a washer replacement is more common than you might think, especially in Australian homes where water pressure and mineral content can vary. Let’s explore why this happens and how to fix it properly.
1. The Tap Seat Might Be Damaged
One of the most common causes of persistent leaks is a worn or corroded tap seat. The tap seat is the metal surface that the washer presses against to stop water flow. Over time, it can become pitted or uneven due to wear and mineral deposits.
If the seat isn’t smooth, even a brand-new washer won’t seal properly — leading to drips.
Solution:
Use a tap reseating tool to grind the surface smooth again. If the damage is deep, you may need to install a reseating insert, which creates a new surface for the washer to seal against.
2. The Washer Size or Type Is Incorrect
Not all washers fit every tap. A washer that’s slightly too small or large can cause water to leak around the edges. The material also matters — rubber, nylon, and silicone each behave differently under pressure and heat.
In Australia, silicone washers are often the best choice because they resist hard water and maintain shape longer than rubber.
Solution:
Always check your tap’s model and use a washer that matches exactly. If unsure, take the old washer to your local plumbing store for reference.
3. The O-Ring or Spindle Is Worn
Many people replace only the washer and overlook the O-ring, the rubber seal around the tap spindle. When this part wears out, water can leak from the tap handle instead of the outlet.
Solution:
Disassemble the tap and inspect the O-ring. If it’s cracked or stiff, replace it with a new one of the same size. O-rings are inexpensive and easy to change.
4. High Water Pressure or Valve Issues
If your home has high water pressure, the constant force can cause leaks, even with a perfect washer. In some Australian regions, mains pressure can exceed 500 kPa, which puts stress on tap fittings.
Solution:
Install a pressure-reducing valve (PRV) or consult a plumber to test and adjust your water pressure. This will protect not only your taps but also your appliances and pipes.
5. Poor Installation or Loose Fittings
Even a small mistake during reassembly can cause leaks. If the tap components aren’t tightened evenly, or if thread seal tape wasn’t used properly, water can escape from joints.
Solution:
Disassemble the tap again, check each component, apply new thread tape, and reassemble carefully. Don’t over-tighten — it can damage threads and cause more leaks.
6. Hidden Cracks or Internal Damage
Older taps, especially those made from brass or chrome-plated materials, can develop fine cracks that allow water to seep through. Sometimes, replacing the entire tap body is the most effective long-term solution.
Final Thoughts
If your tap is still leaking after replacing the washer, the problem likely lies beyond the washer itself. By checking the tap seat, O-ring, spindle, and water pressure, you can pinpoint the issue and fix it properly.
For reliable, high-quality tap washers designed for Australian homes, explore Waterbar — offering durable, water-saving plumbing products that make your bathroom work perfectly, every time.
