Why does my toilet keep running?

What it could mean

Understand the symptoms.

A cistern that keeps refilling may have an inlet valve that does not close or an outlet seal allowing water into the bowl.

What to do next

Look for water moving into the bowl after the flush finishes. A plumber can identify which component is failing rather than replacing parts at random.

When a plumber should assess it

If the fault continues, is affecting other fixtures, risks damage or cannot be identified safely, arrange a professional assessment. Similar symptoms can have different causes, so an inspection is needed before confirming a repair.

What to tell us

• Your suburb and the affected fixture or system
• Whether the problem is continuous or intermittent
• Any noises, visible leaks, odours or recent changes
• Whether it involves a single fixture or several

This article is general guidance. Do not attempt electrical, gas, pressurised, confined-space or unsafe drainage work.

Make the next conversation useful

Questions worth asking about why does my toilet keep running?.

• Which observations would help distinguish the likely causes?
• What can be inspected safely without disturbing concealed plumbing?
• What work, access and materials might be needed before a price can be confirmed?
• What findings would change the repair or replacement recommendation?

Look for water moving into the bowl after the flush finishes. A plumber can identify which component is failing rather than replacing parts at random.

Related homeowner questions

• Why is water pooling around my toilet? — Water on the floor can originate from a supply connection, cistern fittings, the pan seal or condensation.

For work across Sydney, check our service-area information and the booking and pricing FAQs. A written quotation should clarify the scope before work proceeds.