After a major storm, inspect the entire collection and treatment pathway before assuming the stored water is unaffected. Check the roof, gutters, first flush, screens, tank openings, overflow, water appearance, filters, UV operation and any signs that floodwater or animals entered the system.
Immediate visual checks
Only inspect areas that are safe to access. Look for:
- Damaged roofing, flashing or collection surfaces
- Heavy leaf, branch or ash accumulation
- Overflowing or disconnected gutters
- Blocked first-flush devices
- Torn inlet or overflow screens
- Open tank lids or pest entry
- Surface runoff or floodwater reaching the tank
- Electrical or physical damage to pumps and UV equipment
Do not enter a tank. Confined-space and electrical hazards require appropriate controls and expertise.
If floodwater may have entered
Treat this as more than ordinary dirty rain. Floodwater can introduce sewage, animal waste, chemicals and debris. Queensland Health advises caution with rainwater tanks during and after disasters. Avoid relying on appearance alone, and seek public-health or professional advice appropriate to the event.
Check treatment equipment
Heavy particulate loading can shorten cartridge life. Power interruptions can stop UV disinfection, and alarms may indicate lamp, ballast or flow-control problems. Confirm that the system is operating as designed rather than merely switched on.
When cleaning or testing may help
An inspection can determine whether debris has entered or existing bottom sediment has been disturbed. Testing may be appropriate where water is consumed, contamination is suspected or evidence is needed before returning the system to normal use.
Frequently asked questions
- Should I drain the entire tank after every storm?
- No. The response should match the event and evidence. Routine heavy rain is different from confirmed floodwater intrusion, animal entry or major roof contamination.
- Is boiling enough after a storm?
- Boiling targets microbial hazards; it does not remove many chemical contaminants. Follow current Queensland Health advice during declared disaster or contamination events.
- Can I keep using the water for gardens?
- Suitability depends on the suspected contaminant and intended use. Seek specific advice if floodwater, chemicals or sewage may be involved.