Pond liner lifting, bubbling, or floating is usually caused by groundwater accumulating beneath the liner. This creates hydrostatic pressure that pushes the liner upward.
Common causes
- High groundwater levels: Water collects beneath the liner and pushes it upward.
- Heavy rainfall or melting snow: Saturated soil increases groundwater pressure.
- Low pond water level: Draining or lowering the pond reduces the water pressure holding the liner in place.
- Pond leaks: Water escaping from the pond may collect underneath the liner.
- Trapped air or gases: Air or gases beneath the liner can also cause bubbling or lifting.
What should I do?
- Check the pond water level. If the pond is losing water, investigate a possible leak.
- Check recent weather conditions. Heavy rainfall or melting snow may explain temporary groundwater buildup.
- Avoid draining the pond further. Lowering the water level can increase liner lifting when groundwater is present.
- Contact a qualified pond contractor if the problem continues. A drainage system or sump pit may be needed to remove groundwater beneath the liner.
Important: Do not puncture or cut the liner to release trapped water. This can create a permanent leak.