How Often Should You Clean Your Water Tank?
Raj Babbar · 7 min read
Home › Water Tank Cleaning › Underground Sump Cleaning › Model Town
Model Town’s kothi belt is prime underground-sump territory: wide-plot bungalows and builder floors that draw the DJB fill into a buried sump before pumps push it up to the roof. That first, below-ground tank is where the silt settles and where almost nobody looks. Confined-space trained crews, hygienic finish. From ₹1,499.
Model Town was laid out as a planned kothi colony, so most plots here carry the classic North Delhi setup of a big underground sump feeding a rooftop overhead tank. The sump takes the first fill of every DJB cycle, which means the sand and settled sediment carried in the line drop out at the bottom before the pumps lift the clearer water upstairs. Because the water sits twice, once below ground and again on the roof, the buried sump quietly accumulates the heavier load. It sits under the porch or the front lawn, out of sight and out of mind, so a household that only watches the tap can go years without opening the lid. Over those years a slow bed of silt, scale and organic sludge builds along the floor and walls. By the time the water tastes off, that bed is already thick. A scheduled sump clean clears it before it starts tainting the supply the whole house drinks.
KaamGenie handles the buried sump end to end. We open and ventilate it first, test the air, then pump out the standing water, scoop the settled silt by hand, wet-vacuum the fine sludge, and jet-wash the caked mud and biofilm off the floor and walls before a full anti-bacterial disinfectant wash. You get before and after photos of the same corner so the difference is on record. Every entry is treated as confined-space work, with air-testing and a spotter up top throughout. If you want the rooftop tank done in the same visit, see our water tank cleaning in Model Town. This page is specifically about the underground sump that feeds it.
The sump is the first vessel every fill lands in, so whatever grit the DJB line carries settles there rather than travelling up to the roof. In Model Town’s older masonry sumps, hairline cracks in decades-old plaster let a little ground grit and seepage in too, adding to the load. The generous capacity that suits these large bungalows also means water turns over slowly, giving sediment plenty of time to drop and organic film time to form on the walls.
Because it is buried under the porch or lawn, the sump is the easiest tank in the house to forget. Residents attend to the visible rooftop tank while the below-ground one goes untouched for years, sitting as standing water over a thickening sludge bed in still, low-oxygen air. That is exactly why we never send anyone in without ventilating and air-testing first, and why we check the walls for the cracks and seepage common in Model Town’s ageing RCC.
No travel charge anywhere in Model Town. The final price is confirmed on the call before we come — it depends only on tank size and access.
See it done in 45 seconds
Watch our web story on how a tank is really cleaned — drain, de-sludge, jet-wash, disinfect.
We reach every pocket of Model Town — and there’s no travel charge to any of them:
Every locality in Delhi stores different water, and that decides how fast a tank fouls. This is Model Town’s profile from The Delhi Water Index, built from our field observations across 250+ localities.
Indicative field characterisation, not a certified lab test. BIS IS 10500: TDS 500 mg/L acceptable, 2,000 permissible. Check any Delhi area →
“Our Model Town bungalow has a sump under the front porch we have never opened. Can you clean it?” That is the most common call we get in Model Town. A porch or lawn sump that has stayed shut for years usually has a thick silt bed and a stale-air problem, so we open it, ventilate it and air-test before anyone goes in. Then we pump out, scoop and vacuum the sludge, jet the caked scale off the RCC and finish with a disinfectant wash, with before and after photos.
“How much does sump cleaning cost for a Model Town kothi?” It is priced by capacity. A small sump up to about 1,000 litres starts at ₹1,499, a typical bungalow sump of 1,001–2,000 litres runs ₹1,799–2,200, and the larger reservoirs under the bigger plots are ₹2,500–3,500 once we see the size. If you want the rooftop tank cleaned in the same visit, the combined job is ₹2,000–2,800.
“Should the underground sump and the rooftop tank be cleaned together?” Ideally yes, and most Model Town houses do both in one visit because the sump feeds the roof. If only the sump is cleaned, sediment carried up earlier still sits in the overhead tank, and if only the roof is done the buried source keeps feeding silt upward. Doing the pair resets the whole supply chain in one slot.
“How often does a Model Town sump actually need doing?” Once a year suits most bungalows here on clean DJB piped supply. Where the plot also draws borewell water, or where the sump is old masonry that lets grit seep in, twice a year keeps the bed from rebuilding. We will tell you honestly which bracket your sump falls into after we see the first clean.
“Is the disinfectant safe for a family that drinks this water?” Yes. We use an anti-bacterial disinfectant wash rated for drinking-water tanks and rinse thoroughly afterwards, so no residue is left behind. The sump is ready to refill and use once we finish. We avoid harsh solvents entirely and keep to products meant for potable storage.
See our complete water tank cleaning services in Delhi NCR — pricing, process, tank types and full city coverage.
Beyond water tank cleaning, KaamGenie is rolling out a full lineup of home services across Delhi NCR — see our complete list of 12 home services we offer or will be launching through 2026. New to tank cleaning? Read our guide on how to pick the right water tank cleaning service in Delhi — what to look for, what to avoid, and the questions that separate trustworthy crews from quick-job operators.
Rooftop plastic tanks
₹699+ →Kothi sumps & underground tanks
₹1,499+ →Apartments & RWAs
Bulk pricing →FSSAI-compliant cleaning
₹2,500+ →टंकी साफ़ करने वाले
हिन्दी पढ़ें →View all water tank cleaning guides →
All pockets and lanes of Model Town covered. If your specific block or society isn’t named in the sub-areas above, just call — we almost certainly cover it.
Same crew, same 6-step process, same-day where possible. Pick any locality below for local pricing and the tanks we typically find there.
Book a slot — we can usually fit you in today or tomorrow.