Pool Overflowing After Heavy Rain? What to Do Safely

An overflowing pool after Sydney rain is usually manageable, but the water needs to be lowered through the correct system and sent to an appropriate discharge point. Do not improvise with electrical equipment or leave the pump running without supervision.

Is the pool simply full, or has runoff entered it?

Clean rain falling directly into the pool mainly changes the water level and chemistry. Runoff from soil, lawns or garden beds can introduce dirt, fertiliser and organic contamination. That requires more than lowering the level.

How far should the water be lowered?

For a typical skimmer pool, restore the water to around the normal operating level, commonly near the middle of the skimmer opening. Do not lower it far below normal unless a pool professional has advised it.

Use the correct discharge method

Some sand filter systems can send water through the waste setting. Cartridge systems may have a separate waste line or require a suitable pump. Valve layouts vary, so identify the plumbing before operating anything.

Move a multiport valve only while the pump is off. Confirm where the waste line discharges and follow current council and water authority requirements.

What to do after lowering the level

1. Remove leaves and visible debris.
2. Empty the skimmer and pump baskets.
3. Check filter pressure and clean or backwash when required.
4. Run the system and confirm steady circulation.
5. Test the water before adding chemicals.
6. Brush steps, corners and areas where dirty runoff settled.

Why pools turn green after rain

Rain can dilute sanitiser and salt, shift pH, wash contamination into the pool and overload the filter. Warm weather after rain accelerates the problem. Treating only the colour without restoring circulation and filtration often leads to a quick return.

When to call for help

• Dirty floodwater entered the pool.
• The waste line location is unknown.
• The pool keeps refilling after the rain stops.
• The pump lost prime or the filter pressure is abnormal.
• Water reached electrical equipment.
• The pool became green or very cloudy.

Pool Perfectionists provides emergency pool help across Sydney and can restore circulation, filtration and water balance after storms.