Work from accessible edges and fittings toward controlled isolation tests. Avoid draining the pond, moving heavy rocks, or replacing the liner before the source of loss is understood.
1. Make the situation safe
If the water is falling toward the pump intake or fish are distressed, seek prompt help. Switch off electrical equipment before touching it. A fish pond needs an oxygen plan if normal circulation is interrupted.
2. Inspect visible trouble spots
Look for an overflowing skimmer, low liner edge, loose connection, or water leaving a stream. Photograph each clue before disturbing it. Keep track of water added so repeated top-ups do not hide the rate of loss.
3. Separate the pond from the circulating system
Ask a professional whether a monitored pump-off test is appropriate. Stable water during safe isolation can direct attention to the waterfall or plumbing; continued loss can point toward the basin. Rain, evaporation, and drain-back can complicate the result.
4. Let the material determine the repair
A compatible liner patch, fitting repair, or correction to an edge addresses different faults. The repair surface and materials matter. Do not coat an unknown liner with a general-purpose sealant or allow the water to fall indefinitely to find a hole.
5. Confirm the result
After repair, compare water levels under normal operation over an agreed monitoring period. Ask for photographs of concealed work and a written explanation of any remaining uncertainty. A one-time top-up is not evidence that a leak is fixed.
Explore pond leak repair or check referral availability. This guide is general homeowner education, not an on-site diagnosis or emergency service.
Manufacturer guidance applies to the relevant equipment; always follow your own product manual. Links do not imply endorsement or affiliation.