Why Is My Toilet Constantly Running? (And How to Fix It)

A constantly running toilet isn't just annoying — it can waste hundreds of litres of water every day and significantly increase your bills. If you’ve noticed the sound of trickling water long after flushing, it’s time to take action.

At Pleasant Plumbers, we fix leaking toilets across London every day. Here’s what might be causing the issue, and how you can solve it — or when to call in a trusted plumber in London like Pleasant Plumbers.

1. Faulty Flapper Valve

The flapper is the rubber seal at the bottom of the cistern. If it’s worn, misaligned, or broken, water will continue to leak into the bowl.

Fix: Replace the flapper — inexpensive and often a DIY-friendly task.

2. Float Is Too High

The float controls when the water stops filling. If it’s set too high, the water keeps rising and spills into the overflow pipe.

Fix: Adjust the float level to stop the cistern filling too far.

3. Worn Fill Valve

This valve controls water flow into the tank. A worn or broken fill valve won’t shut off properly.

Fix: Replace the valve with a new part. It’s a little more complex but still manageable with basic tools.

4. Leaky Flush Valve Seat

If the valve seat is damaged or corroded, water can leak past the flapper even if it’s new.

Fix: The valve seat may need professional replacement. Contact a plumber in London like Pleasant Plumbers if unsure.

A single running toilet can waste up to 400 litres of water per day — that's over 140,000 litres per year! Left untreated, this can cost you £300+ annually on your water bill.

And that’s not all — overflows can damage flooring, subfloors, or cause leaks in neighbouring flats if you're in a London apartment block.

If DIY fixes don’t work, or you’re dealing with an old or complicated toilet system, it’s time to call a professional.

Our experienced team at Pleasant Plumbers will diagnose the issue, repair or replace faulty parts, and ensure your toilet is working efficiently again — all with transparent pricing and a rapid response.

Don’t let a running toilet drain your time or your wallet.

📲 Call or WhatsApp 0800 046 1000
📧 Email [email protected]
🌐 Visit pleasantplumbers.com

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