
Key takeaways
- Clean every water tank at least every 6 months, ideally once before the monsoon (April–May) and once after it (October–November).
- Monsoon turbidity, old pipelines, tanker water and high humidity all speed up the build-up of sludge, algae and bacteria.
- Muddy or yellow water, bad smell, reduced flow, algae on the walls, or residents reporting stomach infections.
The short answer
Clean every water tank at least every 6 months, ideally once before the monsoon (April–May) and once after it (October–November).
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Why Mumbai tanks get dirty faster
Monsoon turbidity, old pipelines, tanker water and high humidity all speed up the build-up of sludge, algae and bacteria.
Underground tanks collect the most sediment because municipal supply enters them first.
Signs your tank needs cleaning now
Muddy or yellow water, bad smell, reduced flow, algae on the walls, or residents reporting stomach infections.



