Overhead Water Tank Cleaning in Karachi
Pest Tech cleans overhead water tanks across Karachi — plastic, fibre and cement rooftop tanks. We drain the tank, remove algae and sediment, scrub and rinse it, chlorinate for the full contact time and check the residual, then inspect the lid, vents and overflow so dust, insects and mosquitoes stay out.
Estimated starting price — final price confirmed after free inspection: from Rs 1,800 per tank.
Signs your overhead tank needs cleaning
Rooftop tanks get less silt than underground sumps, but Karachi heat, dust and sunlight cause their own problems:
- Green water or a green film on the walls of a plastic or fibre tank
- Dust, leaves or dead insects floating at the surface
- Mosquito larvae near the lid or overflow
- A cracked, loose or missing lid
- Grit in taps even though the tank looks clean from outside
- More than six months since the last cleaning
How we clean an overhead tank
- 01
Inspect the tank and roof access
We check the tank type, lid, vents, overflow and the safety of the roof access before starting.
- 02
Drain
The inlet is closed and the tank is drained through the outlet or a pump.
- 03
Scrub away algae and sediment
Walls and floor are scrubbed and rinsed until algae and settled dust are gone.
- 04
Chlorinate and rinse
A measured chlorine solution is applied for the full contact time, then rinsed out.
- 05
Refill and secure
The tank is refilled, the residual is checked and we advise on lids, mesh and shading.
Plastic, fibre and cement overhead tanks
| Tank type | Typical problem | What helps |
|---|---|---|
| Plastic / fibre | Algae from sunlight through thin walls | Shade or paint the tank; clean every six months |
| Cement / RCC | Sediment and scale; cracks with age | Regular cleaning; repair cracks |
| Any type with a loose lid | Dust, lizards, cockroaches, mosquitoes | Tight lockable lid and fine mesh on vents |
Algae is a sunlight problem: shading the tank or using an opaque tank reduces it far more than cleaning alone. Lids are the other weak point — lids are often left off after a plumber's visit, which is when insects and mosquitoes get in.
Clean the underground tank too
An overhead tank is refilled from the underground sump. If the sump is full of sludge, a freshly cleaned rooftop tank gets dirty again within days, so we recommend cleaning both together — see underground tank cleaning and the main water tank cleaning service. The calculator applies a discount when both are cleaned in one visit.
Mosquitoes and rooftop tanks
Open rooftop tanks are ideal breeding sites for the Aedes mosquito that spreads dengue. Fit tight lids and fine mesh on overflow and vent pipes, and check the tank monthly in the monsoon and dengue season. Our guide to mosquito breeding in water tanks explains what larvae look like, and our mosquito control service treats the breeding sites around the house. Homes in DHA and Clifton with several rooftop tanks often combine both services.
Rooftop safety and hygiene
- Our crew works on rooftops only where access is safe, and never stands inside a tank that is not designed to take a person’s weight.
- Chlorine is measured for the tank volume, left for the full contact time and rinsed out before refilling.
- No detergents, kerosene or household insecticides are used inside drinking-water tanks.
- We tell you if the lid, mesh or overflow needs replacing so insects and mosquitoes stay out.
Overhead tank cleaning price in Karachi (2026)
Overhead tank cleaning is priced per tank by capacity in gallons. Several tanks in one visit and cleaning the underground tank at the same time lower the price per tank.
| Tank size | Estimated price (PKR) |
|---|---|
| Overhead plastic / fibre — up to 300 gal | Rs 1,800 |
| Overhead plastic / fibre — 301 gal–500 gal | Rs 2,200 |
| Overhead plastic / fibre — 501 gal–1,000 gal | Rs 2,800 |
| Overhead plastic / fibre — 1,001 gal–2,000 gal | Rs 3,800 |
Every figure is an estimate until a free inspection confirms the scope of work.
Why Karachi chooses Pest Tech for overhead tank cleaning
We treat a rooftop tank as part of the house: cleaning, lids and mosquito breeding sites are handled together, which is what keeps water clean after we leave.
Trusted by Khalid Foods, Beaconhouse School System, Dunkin' Donuts — plus thousands of Karachi homes.
Overhead Tank Cleaning across Karachi
We treat every district of Karachi from our base in Operative Housing Society. Popular areas:
Related guides
Related services
- Water Tank Cleaning — Underground and overhead tanks cleaned, desludged and chlorinated.
- Underground Tank Cleaning — RCC sumps desludged, washed and chlorinated by a trained crew.
- Tank Disinfection & Chlorination — Measured chlorination after cleaning, floods or for new tanks.
- Mosquito & Dengue Control — Larviciding, residual spray and fogging against dengue mosquitoes.
Overhead Tank Cleaning: frequently asked questions
Sunlight passing through thin plastic lets algae grow. Shade or paint the tank, keep the lid closed and clean it every six months.
Every six months for most homes, more often if the lid is loose or the tank sits in full sun.
You can rinse a small overhead plastic tank from outside without climbing into it. For chlorination, sludge in the sump or any tank you would have to enter, use a trained crew.
We check the lid, vents and overflow on every visit and tell you what needs replacing; lid replacement is quoted after inspection.
Book overhead tank cleaning in Karachi
Send your area and a photo of the problem — we reply with the next free inspection slot.
Mon–Sat, 9:00 AM – 7:00 PM · Free inspection · Re-treatment at no extra cost if pests return