If your pond loses water only when the waterfall is running, the water is likely escaping from the waterfall, stream, or plumbing system rather than through the main pond liner.
Common causes include low liner edges, splashing water, obstructions that redirect water, or leaking plumbing connections.
What should I check?
- Waterfall and stream edges: Inspect the edges for low spots where water may be flowing over the liner. Look for wet soil, mulch, or gravel. Raise the liner edge and support it with soil where needed.
- Splashing water: Check whether water is splashing outside the waterfall or stream. Adjust the rocks to redirect water back into the lined area.
- Rocks, plants, and algae: Remove excessive plant growth, algae, or debris that may be blocking water flow and causing water to overflow the liner.
- Plumbing connections: Inspect accessible pipes, fittings, and pump connections for leaks while the waterfall is operating.
- Waterfall filter: Check for obstructions or overflowing water around the waterfall filter that could allow water to escape outside the liner.
How can I confirm the water loss is coming from the waterfall?
- Fill the pond to its normal operating level.
- Turn off the waterfall pump.
- Allow the pond to sit for 24 hours while monitoring the water level.
- If the water level remains stable with the pump off but drops when the waterfall operates, focus your inspection on the waterfall, stream, and plumbing.
Note: Some water loss from evaporation is normal, especially with moving water. However, rapid or excessive water loss while the waterfall is running usually indicates that water is escaping from the system.
If you cannot locate the source of the water loss, consider having a qualified pond contractor inspect the waterfall and plumbing.