A dripping tap is more than just annoying — it can waste litres of water and increase your water bill. Fortunately, fixing a leaking tap is often simple and inexpensive when you know how. Most leaks come from worn washers, seals, or O-rings, and with a few basic tools, you can fix them yourself.
In this expert guide, we’ll cover how to diagnose the type of leak, repair different tap types, and prevent future leaks. Whether you’re a homeowner or renter in Sydney, these professional plumbing tips will help you stop that drip for good.
How to Diagnose the Type of Leak (Where Is the Leak Coming From?)
Before grabbing your wrench, identify where the leak is actually coming from — this determines which part needs repair.
| Leak Location | Likely Cause | Quick Fix |
|---|---|---|
| Drip from the spout | Worn or damaged washer | Replace washer |
| Leak around the handle | Broken or dried O-ring | Replace O-ring |
| Leak at the base of the tap | Faulty cartridge or corroded valve seat | Replace cartridge / reseat valve |
| Leak under sink | Loose or cracked supply connection | Tighten fittings or replace hose |
Pro Tip: Place a dry tissue around different parts of the tap — it helps pinpoint where water is seeping from.
Common Causes of Leaking Taps and How to Prevent Them
- Worn-Out Washers or O-Rings: Replace every 12–18 months to prevent drips.
- High Water Pressure: Install a pressure-reducing valve to protect internal parts.
- Improper Installation: Follow manufacturer instructions carefully or hire a pro.
- Corrosion and Mineral Build-Up: Hard water can wear parts faster — regular cleaning helps.
- Aging Fixtures: Old taps may need full replacement for lasting results.
Identify Your Tap Type and Repair Method
Before fixing the leak, identify your tap type, as each uses a different mechanism.
1. Compression Tap
How it works: Uses a rubber washer to seal water flow.
Common issue: Washer wears down → drip from spout.
Fix: Replace washer and inspect the valve seat for corrosion.
2. Cartridge Tap
How it works: Uses a cartridge insert for hot/cold control.
Common issue: Damaged cartridge seals → leak around handle.
Fix: Replace the entire cartridge (available at most hardware stores).
3. Ball Tap
How it works: Has a single handle controlling a ball mechanism.
Common issue: Worn seals or springs → leak at base.
Fix: Replace springs and seals; apply plumber’s grease for smoother movement.
4. Ceramic Disc Tap
How it works: Uses two ceramic discs that control flow.
Common issue: Cracked disc or seal → drip even when off.
Fix: Replace both discs or the full cartridge unit.
💡 Pro Tip: If you’re unsure, take a photo of your tap and show it at a hardware store — they can identify the type instantly.
Tools and Materials You’ll Need
Tools
- Adjustable wrench
- Screwdrivers (flat & Phillips)
- Pliers
- Utility knife
- Seat wrench (for valve seat repairs)
- Rag or cloth (to protect chrome)
- Basin plug (to avoid dropping screws)
Materials
- Replacement washers, O-rings, or cartridges
- Plumber’s grease
- Teflon (thread) tape
- Vinegar solution (for cleaning mineral build-up)
- Small bucket or container
Step-by-Step: How to Fix a Leaking Tap
Step 1: Turn Off the Water Supply
- Locate the isolation valve under your sink and turn it clockwise to stop water flow.
- If your tap doesn’t have one, switch off your home’s main water supply. Then, open the tap to release any remaining water.
Step 2: Disassemble the Tap
- Use a screwdriver to remove decorative caps and the handle.
- Unscrew the cover plate and expose the internal mechanism.
- Keep small screws and parts in a bowl to avoid losing them.
Common Mistake: Don’t use excessive force — it can strip threads or crack the tap body.
Step 3: Inspect and Replace Damaged Parts
- Look for worn washers, cracked O-rings, or corroded valve seats.
- Clean any mineral build-up using vinegar.
- Replace damaged parts with new ones, matching size and type exactly.
Pro Tip: Apply a small amount of plumber’s grease to new washers and O-rings — it extends their life and ensures a watertight seal.
Step 4: Reassemble and Tighten
Reinstall all parts in reverse order. Tighten screws snugly but don’t overtighten, as it can cause leaks or damage threads.
Step 5: Test for Leaks
- Turn the water back on slowly and test the tap.
- If it still drips, recheck part alignment and washer seating.
- If leaks persist, it may indicate a worn valve seat or cartridge.
Pro Tips & Common Mistakes to Avoid
Pro Tip: Wrap a soft cloth around the tap before using a wrench to avoid scratches.
Mistake: Forgetting to plug the sink — tiny screws can easily fall down the drain!
Pro Tip: Replace both hot and cold tap washers at the same time to balance wear.
Mistake: Using chemical cleaners inside taps — they corrode seals
Preventive Maintenance Tips
Regular upkeep can extend your tap’s life and prevent future leaks:
- Flush out mineral deposits every few months using vinegar.
- Lubricate moving parts annually with plumber’s grease.
- Check water pressure — excessive pressure accelerates wear.
- Inspect handles and bases for early signs of weeping or corrosion.
Sydney Note: Sydney’s water supply contains moderate mineral content, which can wear washers and O-rings faster. Inspect taps twice a year for early drips.
When to Call a Professional Plumber
Call a licensed plumber if:
- The leak persists after replacing parts.
- The valve seat is corroded or pitted.
- Water is leaking from multiple taps.
- The tap body or wall fitting is cracked.
At Mates Rates Plumbing Sydney, our expert plumbers offer same-day leaking tap repairs, valve seat resurfacing, and cartridge replacements across Sydney CBD, Inner West, Parramatta, and the Northern Beaches.
Contact us today for reliable service and long-term plumbing solutions.
Conclusion
Fixing a leaking tap is a quick, rewarding DIY project that saves water and money.
By identifying your tap type, replacing worn components, and following proper maintenance, you’ll enjoy drip-free, efficient taps for years.
And if that stubborn leak refuses to stop — don’t stress. The experts at Mates Rates Plumbing Sydney are just a call away for fast, affordable, and guaranteed repairs.
