Why Your Faucet Is Leaking (Causes, Fixes & When to Call a Plumber)
Why Your Faucet Is Leaking (Causes, Fixes & When to Call a Plumber)
A leaking faucet might seem small, but it can waste hundreds of gallons of water a year and increase your water bill. Most leaks start from minor issues — worn parts, loose connections, or mineral buildup — but if ignored, they can become a costly repair.
This guide explains:
- Why faucets start leaking
- How to diagnose the problem
- Simple DIY fixes you can do
- When you should call a plumber
The Most Common Reasons Your Faucet Is Leaking
1. Worn-Out Washer
Rubber washers deteriorate over time, especially from high water pressure.
Fix: Replace the washer with a matching size (cheap & easy).
2. Damaged O-Ring
The O-ring creates a seal inside the faucet. If worn, water drips from the handle.
Fix: Replace the O-ring and apply plumber’s grease.
3. Mineral or Sediment Buildup
Hard water leaves mineral deposits that damage internal parts.
Fix: Soak parts in vinegar to remove calcium & scale.
4. Loose or Worn Cartridge (Modern Faucets)
Single-handle faucets often leak due to cartridge wear.
Fix: Replace the cartridge — most home improvement stores carry them.
5. High Water Pressure
Excess water pressure forces water past seals, causing leaks.
Fix: Ask a plumber to check pressure regulators.
Step-by-Step DIY Leak Check
Before starting: shut off the water under the sink.
- Turn off water supply valves
- Remove handle and cap
- Inspect washer, O-ring, and cartridge
- Clean parts with vinegar if buildup is present
- Replace damaged parts
- Reassemble and test
If the leak continues, the issue is deeper than the faucet.
Faucet Repair Cost (Average US Pricing)
| Repair Type | Average Cost |
|---|---|
| DIY Repair Kit | $10–$35 |
| Cartridge Replacement | $50–$150 |
| Professional Repair | $120–$300 |
| Full Faucet Replacement | $150–$450 |
If your faucet is old, upgrading may be more cost-effective.
When to Call a Plumber
Call a professional if:
- Water leaks under the sink
- Handles won’t tighten or seal
- Water pressure is inconsistent
- Leak returns after DIY fixes
- You see corrosion on valves or pipes
A licensed plumber can diagnose internal or pressure-related issues safely.
Final Takeaway
A leaking faucet isn’t just annoying — it costs money and wastes water. Fixing it early saves time, stress, and your water bill.
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