Troubleshooting Your Pond: How to Identify and Fix Liner Leaks

Troubleshooting Your Pond: How to Identify and Fix Liner Leaks

Maintaining a healthy and leak-free pond is crucial for any pond owner. However, leaks can happen in any pond, regardless of its size or construction. Finding and repairing a leak in a pond liner can be a daunting task, especially for new pond owners. In this set of questions and answers, we discuss various aspects of pond liner leaks, including how to find them, fix them, and prevent them from happening in the future.

How to find a leak in a pond liner

To find a leak in a pond liner, look for any irregularities such as a large tear or a small pinhole. For fast leaks, try spraying milk from a squirt bottle into the water at the edges of the pond. The milk will cloud the water where there is no leak and will flow towards the hole if there is one.

What happens if water gets under pond liner?

If water gets under a pond liner, the liner will move as it cannot withstand the pressurised water coming from underneath it. Even heavy boulders and rock retaining walls cannot hold back the water pushing against the entire liner wall that the stones are sitting on.

Can you repair a pond liner underwater?

Yes, you can repair a pond liner underwater with a pond repair sealant and a patch of pond liner. First, purchase the sealant and patch, then apply a bead of sealant all around the edge of the patch and place it over the hole.

How do you measure a hole in a pond liner?

To measure a hole in a pond liner, use a tape measure or ruler to measure the length and width of the hole.

How do you fix a leaky pond liner?

To fix a leaky pond liner, drain the water down to the hole, dry the area around it, apply primer, cut the patch into a circle, use a roller to apply the patch, and wait a few minutes for it to set. Finally, refill the pond.

Can I put a new pond liner over an old one?

It is not recommended to lay a new pond liner directly over the top of an old liner. If the original pond liner has any holes or cuts that are not at the lowest point, these will provide an entry point for water to get between the two layers.

How waterproof are pond liners?

Pond liners are essentially a waterproof fabric designed to prevent water from seeping into the ground. Not all pond liners are created equal, so it is advisable to check the guarantee terms and conditions before placing an order.

How do you find a leak in a pond with dye?

To find a leak in a pond with dye, pour pond dye or milk around the edges inside the pond and stream. If it is leaking, then the discoloured water or soil may help determine where a leak is by following the path of discoloured water. If using milk, do a water change or clean the pond to dilute the milk.

Why is my pond liner leaking?

Pond liner leaks can be caused by splitting liner exposed at the edges of the pond, not just under the water. Most ponds will have their outer liner secured with stones, slabs, or natural rocks, which provides support for the outer edges and stops water from leaking into the surrounding sediment.

How long should a pond liner last?

Pond liners can last over 30 years if the right material is chosen and installed correctly. A good-quality EPDM pond liner can last even longer than that. PVC pond liners can be an economical option for smaller ponds.

How often do pond liners need to be replaced?

EPDM and rubber pond liners, in general, can last upwards of 30 years. Plus, they aren’t too expensive to repair if they get torn by digging or tree roots. Other liners can last anywhere from 20 years to having a lifetime guarantee.


In summary, a pond liner leak can be a frustrating and time-consuming issue to deal with, but with the right knowledge and tools, it can be fixed. The key to preventing leaks is to choose the right type of liner for your pond, install it properly, and maintain it regularly. In case of a leak, there are several ways to locate and repair it, including using sealant and patches. Regular inspections and maintenance can help to prevent leaks and ensure that your pond stays healthy and enjoyable for years to come.

Last Modified: April 3, 2023