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5 Reasons for Your Leaking Toilet

Posted on: May 11th, 2018 by Active

A picture of a toilet


Have you recently noticed a leak in your toilet? A leaking toilet can have a number of different causes; some are more obvious than others and some will need the help of a plumber to diagnose. To help you out, below we’ve shared 5 of the top reasons why there might a leak in your loo.

Faulty Connections

If you have any faulty connections in a part of your toilet, this could be the cause of your leak. If you’ve got a leaking toilet, check for any damaged parts that might be visible. There may also be damage to rubber linings which are there to prevent leaks.

Supply Line Leak

Your leaking toilet could be caused by a leak in the supply line. If the supply line is damaged or loose, it will allow water to soak through, hence the leak you will have noticed. As mentioned above, if the rubber lining has worn out or ruptured, it will also cause water to come through.

Faulty Fill Valve

Faulty fill valves are another common reason for leaks in toilets. Over time, the fill valve in your toilet will start to wear down, making it work less effectively. Your fill valve may also fail to shut off which could result in the leak.

Toilet Tank Is Broken

Your leak could be coming from the toilet tank. Impact on the tank could create a crack, and even the smallest of cracks can cause a leak. Your toilet fill valve will continue to replenish water even with a broken toilet tank, and the water will seep through the crack. If you notice a leak, check for cracks; they could be as thin as a strand of hair.

Toilet Flapper Is Stuck

Another reason for a leak in your toilet is a stuck flapper. This is usually down to the flush handle getting stuck down but the fill valve still continuously working; this can cause an overflow of water and a severe leak.


These are by no means the only reasons you may have a leaking toilet. Whatever the issue, if you see a leak, it’s time to call a plumber! To find out more, get in touch with Mirage Heating & Plumbing Supplies Ltd. Fill out our online contact form, or give us a call on 0208 947 6105.