Summer Water Crisis: Why Tank Cleaning Matters Most in Delhi
Heat, tanker grit and tanks running to empty. Delhi summer is when stored water is at its worst — and least attended to.
Between April and July a Delhi tank faces every unfavourable condition at once, and most households respond by cleaning less because water is too precious to drain.
Four things that change in summer
Temperature. A black or dark tank in direct Delhi sun reaches temperatures where bacterial growth rates rise sharply. Water that would stay acceptable for a week in January does not in May.
Tanker grit. When DJB supply falls short, tankers fill the gap. Tanker water carries far more suspended solids than piped supply, and there is no practical way to verify when the tanker itself was last cleaned.
Tanks running to empty. In shortage, tanks are drawn right down to the base every day. That means every household is drinking water that has just passed through the disturbed sediment layer — the exact layer that stays undisturbed the rest of the year.
Consumption doubles. More water through the same tank means more sediment deposited and more of it stirred.
The "I cannot waste water" objection
It is a fair objection and it has a straightforward answer. A professional clean uses far less water than people assume — we drain to the sludge line rather than emptying and refilling repeatedly, recover usable water where possible, and route drained water to garden or washing use rather than to the drain. The total water cost of a properly executed clean on a 1,000-litre tank is a fraction of what a day of running a leaking tap wastes.
Timing it well
- Best: late February or March, before peak demand starts
- Also good: immediately after a tanker delivery run ends
- Avoid: mid-May afternoons — for the crew’s sake as much as anything
- Essential: September or October, after the monsoon deposits its turbidity
Summer measures worth taking
- Shade or cover an exposed tank — the cheapest improvement available
- Shorten the interval to four months if you take tanker deliveries
- Check the lid seal before summer, not during
- Clean the sump before the season, not after — it is the asset taking the tanker grit
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