Water Tank Cleaning in Coimbatore

Water Tank Cleaning in Coimbatore What to Check

No script

Most Coimbatore homes store water in two places: an underground sump that receives corporation or tanker water, and an overhead tank on the terrace that feeds the taps. Both collect silt, algae and sometimes dead insects or lizards over time. Cleaning them regularly keeps water clear and reduces health risks. This guide explains the job, the safety issues, and what to check whether you hire a service or organise it yourself.

Signs Your Tank Needs Cleaning

Silt or sand in buckets or at the bottom of the tank.
A green or brown film on the walls (algae).
Smell or change in taste.
Low pressure at taps from blocked outlets.
It has been more than six months since the last cleaning.
After heavy rain, flooding, or water from a new tanker source.

How Often

Many water and health guidelines suggest cleaning household storage at least once or twice a year, and more often if you see the signs above. Look inside the overhead tank every few months with a torch. Before the monsoons is a sensible time, as runoff can bring more dirt.

What a Proper Cleaning Involves

Plan the water: stop inflow and store water for the hours of cleaning.
Drain the tank, using the remaining water for gardening or floors.
Remove sludge from the bottom with buckets or a pump.
Scrub walls, floor and the underside of the lid with brushes. Some services use high-pressure water jets.
Vacuum or pump out the dirty water.
Disinfect: a measured chlorine solution applied to the walls and floor, left for the recommended contact time.
Rinse well to remove the disinfectant.
Refill, run the taps to flush the pipes, and check the water is clear.

Ask the service to show you before and after photos of the inside, especially for the sump, which you cannot easily see.

Safety: the Most Important Part

A sump is a confined space. Air inside may lack oxygen or contain gases, particularly if the sump has been closed for a long time or has organic sludge. Workers have died in such spaces in India, and often the person who goes in to rescue them dies too.

If anyone has to enter:

Open the lid well in advance and ventilate; a blower helps.
The worker should wear a safety harness tied to a rope held by someone outside.
At least one person must stay outside watching at all times.
No petrol pumps or generators near the opening (exhaust gas).
Use low-voltage or battery lights, not bare wiring near water.
If someone collapses, do not climb in. Call for help and pull them out with the rope.

Choose a service that follows these steps and has trained workers. Mechanised cleaning with pumps and jets reduces how long anyone has to stay inside.

Overhead tanks bring a different risk: working at height on the terrace. The worker needs a stable ladder and should not lean over the edge.

Choosing a Tank Cleaning Service

Ask:

What steps they follow (compare with the list above).
What disinfectant they use and how they rinse it out.
What safety equipment their workers use for sumps.
Whether they clean the sump and overhead tank in the same visit, and how long water will be off.
The total price, with or without disinfection, and whether it depends on tank size.
Whether they give photos after the job.

Many housekeeping companies offer tank cleaning as an add-on; our guide to hiring housekeeping services covers what to check in those contracts.

After Cleaning

Keep the lid closed and sealed, with a mesh on vents, to keep out insects, lizards and dust.
Check the overflow pipe has a mesh cover.
Fix any cracks in the sump; ground water or drain water can seep in. A plumber in Coimbatore can check pipes and valves at the same time.
For drinking water, use a purifier or boil it; see our guide on choosing a water purifier service centre.

Rainwater and Borewell Tanks

If you store rainwater or borewell water in a separate sump, clean it on the same schedule and keep it separate from drinking water unless it is treated. Our rainwater harvesting guide explains filters and storage.

Apartments

In apartments, the association usually arranges cleaning of common sumps and overhead tanks. Ask when it was last done, whether photos are shared, and whether residents are told in advance so they can store water.

Red Flags

Workers sent into a sump without ventilation, harness or someone outside.
No disinfection, or disinfectant not rinsed out.
No photos of the cleaned sump.
Lids left open or broken after the job.

Next Steps

Check your tanks with a torch, book a cleaning before the monsoons, choose a service that follows safe steps, and keep the lids sealed afterwards. You can find tank cleaning and housekeeping services listed in the Kovai Yellow Pages directory.

Frequently Asked Questions (FAQ)

How often should a water tank be cleaned?

Many water and health guidelines suggest cleaning household storage tanks and sumps at least once or twice a year, and more often if you see sediment, algae, smell or a change in colour, or after flooding or a long dry spell. Check the inside of the tank every few months.

Is it safe to enter a sump to clean it?

A closed sump is a confined space: air inside can lack oxygen or contain harmful gases, and people have died entering such spaces. Anyone entering should have ventilation, a safety harness and rope, a person watching outside, and training. Do not send an untrained worker inside, and never enter to rescue someone without protection - call for help.

What chemicals are used to disinfect a water tank?

Services commonly use a measured chlorine solution after scrubbing and draining, then flush it out before refilling. Ask what product and dose they use, and make sure the tank is rinsed and the water is safe before drinking. For drinking water, a purifier or boiling adds another layer of safety.

Do plastic tanks need cleaning too?

Yes. Plastic tanks collect silt and can grow algae, especially if sunlight passes through the walls. Clean them on the same schedule and keep the lid closed and sealed.