A family in Delhi couldn't figure out why they kept getting mosquitoes inside their flat. Third floor, no open drains nearby, windows meshed. They'd emptied every bucket they could find. Still — mosquitoes every evening.
A pest control ↗ inspection found the source: a decorative water fountain in the corner of the living room. It had been switched off for two weeks because of a loose plug. The water was still sitting there. That small, still container had hundreds of larvae in it.
This is more common than people think. The obvious breeding sites — open drains, outdoor puddles, uncovered water tanks — get cleaned. The hidden ones don't. And Aedes aegypti, the mosquito responsible for dengue, specifically prefers small, clean, indoor water containers. It's not looking for a pond. It's looking for your fridge drip tray.
The ones hiding in plain sight
The desert cooler tray. Everyone knows coolers breed mosquitoes. What fewer people do is actually deal with it properly. Emptying the tray isn't enough — Aedes eggs stick to the inner surface of the container and survive without water for months. You have to empty it, scrub the walls of the tray, and dry it. If the cooler is running, change the water every three to four days and add a tablespoon of kerosene to prevent larvae from breathing.
Flower pot saucers. The shallow dish under every potted plant. Even a centimetre of water sitting there for four or five days is sufficient. Most people water their plants and never check what's pooling underneath. In a home with six or eight pots, those saucers can sustain a quiet breeding cycle for weeks.
The money plant bottle. Almost every Indian home has one — a glass bottle or jar with a money plant cutting sitting in water. That water needs to be changed every two to three days and the roots scrubbed. The roots themselves create ideal surfaces for egg attachment. If the bottle's been sitting untouched on a shelf for a week, check it.
The ones nobody checks
The AC drip tray. Split air conditioner units collect condensation in an internal tray that drains through a pipe. If that pipe is even partially blocked, water accumulates inside the unit in a dark, enclosed space — exactly where mosquitoes want to lay eggs. Most households never clean this. A window AC with a drip bucket on the balcony is the same problem — if that bucket isn't emptied daily, it's a breeding site.
The refrigerator drip pan. Fitted at the back or underneath the fridge, above the compressor. It collects condensation. The compressor keeps the area warm. It's dark and undisturbed. Almost nobody knows it exists, let alone cleans it. Pull your fridge out from the wall and have a look. You might find standing water that hasn't moved in months.
The RO waste water bucket. A lot of Indian households collect the waste water from their RO purifier for cleaning or mopping. Completely fine habit. But if that bucket sits uncovered for more than four or five days, it's a mosquito nursery. Keep it covered, or use the water faster.
Toothbrush holders and bathroom cups. The cylindrical ones that sit on your sink. Water drips from the brushes and collects at the bottom — often just a few millimetres, enough in warm weather. This one genuinely surprises people. Rinse and dry them every few days.
The ones outside that feed the indoors
Tyres. If there's an old tyre anywhere in your compound, terrace, or garage, it's one of the most productive breeding sites that exists for mosquitoes. The circular shape holds water perfectly, it's black so it heats up and maintains warmth, and it's nearly impossible to dry fully. Get rid of it if you can. If you can't, drill a drainage hole at the lowest point or keep it inverted and covered.
Terrace drainage that doesn't drain fast enough. After rain, flat terraces collect water that takes hours or even days to drain through slow or partially blocked exits. If your terrace has areas where water pools regularly after rain, that's a breeding site appearing every monsoon like clockwork. Clean the drain outlets before the rains start.
Plant pots left in the open. Pots without drainage holes are the worst — they hold water at the root level after watering and nobody thinks to check. But even drainage-hole pots left in the open catch rainwater from above. Any container with a hollow and no drainage is a potential site.
Overhead water tank gaps. A tank that's supposed to be covered but has a loose lid, a broken edge, or a gap around the inlet pipe — mosquitoes go in, lay eggs, larvae develop in the stored water. This is particularly worth checking in older homes. The tank cover should fit flush with no gaps.
The check nobody does but should
India's National Vector Borne Disease Control Programme recommends a weekly "dry day" — one day a week where you walk through and systematically check every possible water container. Empty it, scrub it, and either keep it dry or properly covered.
Fifteen minutes. One day a week. That's the habit that actually makes a difference — more than any repellent product, because it addresses where the mosquitoes are coming from instead of just reacting to the ones that are already there.
If you live in a flat and your compound has water management issues — clogged drains, areas that don't dry, water tanks with broken lids — that's a building-level problem. Professional mosquito treatment covering breeding sites, larvae treatment, and residual spraying on walls and resting surfaces is the most thorough way to handle it.
