How to Find and Fix a Pond Leak

A leaking pond is concerning, but most leaks can be found and fixed with a clear, step-by-step approach. Use the checks below to identify where the water is escaping and what to do next.
1. Turn off the pumps
Start by turning off the pumps for twenty-four hours. If the water continues to drop during this time, the leak is likely in the pond itself. Allow the water level to fall until it stabilises. The leak usually sits along that line. If the water drops very low, move fish into a temporary holding pool. Check the pond edging for low spots. If everything looks correct, the liner may have a puncture.
2. Run the waterfall or fountain
If the water level does not drop with the pumps off, the leak may be in the waterfall or fountain. Measure the water level before switching the system back on. Run the feature and recheck the level over several hours. The change in level helps show how severe the leak is and where to focus next.
3. Check the edges
While the waterfall is running, expose the liner edges and look closely for water escaping over the sides. Wet soil or damp patches often indicate a low edge. More than one low edge is possible, so check the entire feature. Once corrected, monitor the water level to confirm the issue is resolved.
4. Check the hose line
If the waterfall edges are sound, inspect the hose and fittings. Loose connections are a common cause of slow leaks. Make sure fittings are secure and check the hose for cracks or damage, as temperature changes can weaken certain materials.
5. Fix the leak
If you find a puncture, use a liner repair kit on the damaged area. Make sure the surface is clean and fully dry before applying the patch. If the liner has more than two damaged areas, it is usually best to reline the pond to prevent further leaks in the future.
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