Diagnosing a Leaking Fountain: Splash Loss vs. Plumbing Leaks

Why a Fountain Loses Water Only When Running

If a fountain (planter over reservoir) holds water when off but loses it rapidly when running, the pump isn't leaking—water is escaping externally during operation.

Common Culprits

• Splash/overspray – Wind carries droplets outside basin; even minor splash adds up.
• Supply line routing – Pipe passes over reservoir edge; drips down outside.
• Planter overflow – Water spills over planter lip away from return path.
• Chicken wire/rock displacement – Alters flow, directs water outward.

Troubleshooting Steps

1. Run fountain on calm day; observe all water paths.
2. Check supply line for drips at fittings/over reservoir rim.
3. Adjust flow rate down; test if loss decreases proportionally.
4. Add splash guards or raise basin rim.

Quick Test

Fill reservoir, mark level, run 1 hour. Measure loss. Refill, mark, run 1 hour with pump outlet blocked (if possible). Compare. If loss only with flow, it's splash/plumbing routing.

Most "mystery leaks" are splash—simple adjustments usually fix it.