26 Mar Why Is My Tap Dripping Even After Replacing the Washer?
Quick Answer:
If your tap is still dripping after replacing the washer, the problem is usually caused by a damaged valve seat, worn O-ring, incorrect washer size, or internal corrosion. In many cases, the washer isn’t the root cause of the leak.
You Replaced the Washer… So Why Is It Still Dripping?
It’s a frustrating situation. You’ve taken the time to turn off the water, pull the tap apart, and replace the washer — only to find that annoying drip is still there.
The truth is, while worn washers are one of the most common causes of leaking taps, they’re not the only culprit. In many cases, the washer is just one part of a larger system, and replacing it doesn’t fix underlying issues inside the tap.
For homeowners in Adelaide, this is especially common in older homes where plumbing fixtures have experienced years of wear and tear, mineral buildup, or fluctuating water pressure.
Let’s break down the real reasons your tap might still be dripping — and what you can do about it and if you need to call a professional plumber or not.
Common Reasons Your Tap Is Still Dripping
1. The Valve Seat Is Damaged
The valve seat is the surface inside the tap that the washer presses against to create a watertight seal. Over time, this area can become corroded or pitted due to mineral deposits and constant water flow.
Even with a brand-new washer, a damaged valve seat won’t allow a proper seal — which means water will continue to seep through and cause that persistent drip.
2. The Washer Is the Wrong Size or Type
Not all washers are created equal. If the washer you installed is slightly too small, too large, or made from the wrong material, it won’t seal properly.
Common issues include:
Using a washer that doesn’t fully cover the seat
Choosing a washer that’s too hard or too soft
Installing low-quality washers that wear out quickly
Even a small mismatch can lead to ongoing leaks.
The O-ring is a small rubber ring located around the tap spindle. Its job is to prevent water from leaking around the handle and internal components.
If the O-ring is worn, cracked, or flattened, it can allow water to pass through — contributing to leaks that may seem like a washer issue.
4. The Tap Seat Is Loose or Misaligned
Sometimes the problem isn’t wear — it’s alignment. If the internal components of the tap aren’t sitting correctly, the washer won’t make even contact with the valve seat.
This uneven pressure can allow water to escape, even if all parts appear to be in good condition.
5. High Water Pressure
Excessively high water pressure can force water past the washer, especially if there are minor imperfections in the seal.
This is more common than many people realise and can lead to repeated tap issues, not just dripping.
6. The Tap Assembly Is Worn Out
If your tap is older, the internal components may simply be too worn to function properly. Years of use can cause metal parts to degrade, threads to loosen, and seals to become unreliable.
In these cases, replacing the washer is only a temporary fix — or won’t work at all.
Quick Diagnosis Guide
Use this table to help identify what might be causing your dripping tap:
| Symptom | Likely Cause | Recommended Fix |
|---|---|---|
| Drip continues after washer replacement | Damaged valve seat | Re-seat or replace valve seat |
| Leak around tap handle | Worn O-ring | Replace O-ring |
| Tap feels rough or squeaky | Internal corrosion | Clean or replace components |
| Drip worsens with high pressure | Water pressure too high | Install pressure regulator |
| Washer fails quickly | Incorrect washer type | Use correct size/material |
How to Fix a Tap That Still Drips
If you’re confident with basic DIY plumbing, you can try the following steps:
- Turn off the water supply
Always shut off the mains or isolation valve before starting. - Remove the tap handle
Carefully unscrew and expose the internal components. - Check the washer
Confirm it’s the correct size and properly seated. - Inspect the valve seat
Look for signs of corrosion, grooves, or roughness. - Replace the O-ring
Swap out any worn or brittle rubber rings. - Reassemble and test
Turn the water back on and check for leaks.
Important: If the valve seat is damaged, repairing it often requires a specialised reseating tool — something most homeowners don’t have.
When DIY Won’t Fix the Problem
While DIY fixes can work for simple issues, there are times when the problem goes beyond a quick repair.
You may need professional help if:
The tap continues dripping after multiple attempts
The valve seat is visibly damaged
Internal components are heavily corroded
The tap is old and repeatedly failing
At this point, continuing to repair the tap can cost more time and money than replacing or properly fixing it.
When to Call a Plumber in Adelaide
If you’re in Adelaide and dealing with a persistent dripping tap, calling a licensed plumber can save you time, frustration, and water.
A professional can:
Accurately diagnose the root cause
Repair or replace damaged components
Ensure a long-term solution (not just a temporary fix)
Instead of repeatedly replacing washers, a proper repair ensures the issue is resolved the first time.
How Much Water Can a Dripping Tap Waste?
A dripping tap might seem minor, but over time, it can waste a surprising amount of water.
| Drip Rate | Water Wasted Per Year |
|---|---|
| 1 drip per second | ~11,000 litres |
| Fast drip | 20,000+ litres |
That’s not just bad for the environment — it can also increase your water bills significantly.
FAQs
Why is my new washer not sealing properly?
This is usually due to a damaged valve seat or incorrect washer size. Even a new washer won’t work if the surface it seals against is uneven.
Can a dripping tap fix itself?
No — in fact, it typically gets worse over time as components continue to wear.
Is a dripping tap an emergency?
Not always, but it can waste significant water and lead to higher bills if left unresolved.
Should I replace the whole tap instead?
If the tap is old or keeps failing, replacing it is often the most cost-effective long-term solution.
Need Help Fixing a Dripping Tap?
A dripping tap isn’t just annoying — it’s a sign that something isn’t working properly inside your plumbing system.
If you’ve already replaced the washer and the problem persists, it’s time to address the real cause.
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