Water Tank Disinfection & Sanitisation in Delhi

What is water tank disinfection & sanitisation?

Water tank disinfection is a sanitisation-first service focused on killing what you cannot see. Ordinary cleaning removes sediment and slime; disinfection goes further, using a measured dose of food-grade chlorine or hydrogen peroxide held at the correct contact time to destroy the bacteria, E. coli, coliforms and algae living in the tank and on its walls. It is what you book when the concern is health — illness in the house, a bad smell, or water that simply is not safe to trust.

It is for any Delhi household or building that has had a scare: families where someone has had a waterborne stomach infection, homes after a suspected sewage or drain cross-contamination, tanks that have sat unused during a long trip, or premises that need documented sanitisation for hygiene reasons. We always scrub and clear the tank first — disinfectant cannot work through a layer of sludge — then apply the sanitisation step, and can arrange a lab water test so you have proof the water is safe.

Our water tank disinfection & sanitisation process

Same thorough process for every job — no shortcuts.

1. Empty & inspect — We drain the tank and check the walls and floor for biofilm, algae and sediment — disinfectant only works on a clean surface, so this comes first.
2. Scrub & vacuum — A food-grade brush-down loosens the biofilm that shelters bacteria, then an industrial wet vacuum removes every trace of slurry so nothing shields the germs from the sanitiser.
3. Dose the disinfectant — We mix a measured, food-grade chlorine or hydrogen peroxide solution to the correct concentration for your tank volume — strong enough to kill, safe once rinsed.
4. Full contact time — The solution coats every wall, the floor, the inlet and outlet and is held for the required contact period — this dwell time is what actually destroys E. coli, coliforms and algae.
5. Rinse to safe — We flush the tank with clean water until the residual reads safe, so there is no harsh chlorine taste or smell left in your supply lines.
6. Optional water test — On request we collect a post-disinfection sample for lab testing, giving you documented proof the bacterial count is back within safe drinking limits.

What water tank disinfection costs in Delhi

Disinfection is priced on the standard published per-size table — the sanitisation step is included in the tank rate. An optional lab water test can be added if you want documented proof of safety.

Tank size	Price
Up to 500 Litres	₹699
501 – 1000 Litres	₹899
1001 – 1500 Litres	₹1,299
1501 – 2000 Litres	₹1,499
2001 – 3000 Litres	₹1,999
3001 – 5000 Litres	₹2,499
5001 – 10000 Litres	₹3,999
Above 10,000 Litres	Quoted per visit

Prices include GST for residential customers; commercial premises get a separate GST invoice. Call 95603 66362 for an exact quote.

Why a smell or an illness means disinfection, not just cleaning

The dangerous stuff is invisible. Sediment you can see and scoop out, but E. coli, coliform bacteria and other pathogens are microscopic — the water can look perfectly clear and still make you ill. A smell, a strange taste, or a household stomach bug is often the only warning that the bacterial load has climbed too high.

Delhi tanks are warm incubators. A black plastic tank baking on a Delhi rooftop sits at the exact temperature bacteria love. Add the biofilm that grows on the walls — a slimy layer that shelters germs from the chlorine already in DJB supply — and even municipally treated water can turn unsafe inside the tank itself.

Contamination has real sources. A cracked lid letting in birds, insects or lizards; a rooftop drain backing up; a tanker delivery of dubious water; a pipe cross-connection — any of these can seed a tank. Once contaminated, only a proper disinfection with the correct dose and contact time makes it safe again. If you are seeing urgent warning signs, do not wait.

Food-grade chlorination vs hydrogen peroxide — and water testing

We use two food-grade sanitisers depending on your preference. Chlorination is the proven, WHO-referenced method — reliable and economical, with a mild chlorine smell that clears within hours of the final rinse. Hydrogen peroxide is the low-odour option: it breaks down into water and oxygen leaving no residual taste, which many families prefer for drinking-water tanks. Both are dosed to concentration and held for full contact time; the difference is smell and cost, not effectiveness.

For anyone who wants certainty — after a genuine illness, or for a premises that needs a hygiene record — we can collect a post-disinfection sample for lab water testing covering bacterial and coliform counts. You get a documented result showing the water is back within safe drinking limits. Pair disinfection with a regular clean every 4 to 6 months (book overhead tank cleaning) to keep the bacterial load from creeping back.

Common questions

“What is the difference between cleaning and disinfection?” Cleaning removes the sediment, sludge and biofilm you can see and scrub out. Disinfection goes further — a food-grade chlorine or hydrogen peroxide dose held at the correct contact time to kill the bacteria and E. coli you cannot see. We always clean first, then disinfect, because sanitiser cannot work through sludge. From ₹699.

“Someone at home fell ill — can you come today?” Yes, we prioritise disinfection after a suspected waterborne illness and offer same-day slots across Delhi where possible. We drain, scrub, and sanitise with a full-contact food-grade dose, then rinse to safe. Call 95603 66362 and mention it is an illness case so we fast-track you.

“Do you use chlorine or hydrogen peroxide?” Your choice. Chlorination is the proven, economical method with a mild smell that clears in hours; hydrogen peroxide is low-odour and leaves no aftertaste, which many families prefer for drinking water. Both are food-grade, dosed to concentration and held for full contact time — equally effective at killing bacteria.

“Can you test my water afterwards to prove it is safe?” Yes. On request we collect a post-disinfection sample for lab testing of bacterial and coliform counts, so you get a documented result showing the water is within safe drinking limits. It is a popular add-on after a genuine illness or contamination scare, and for premises that need a hygiene record. Ask when you book.

“Will the water taste of chlorine after disinfection?” Only very briefly, if at all. We rinse the tank with clean water until the residual reads safe, so there is no harsh taste in your supply. Any faint chlorine smell clears within 4 to 6 hours of the final rinse. If you want zero aftertaste, choose the hydrogen peroxide option, which leaves none.

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Ready to book?

Call +91 95603 66362, WhatsApp here, or use the booking button at the top. Same-day where possible across Delhi NCR.