Short answer: Vastu for a water tank depends on whether it sits above or below ground. A sump or borewell belongs in the north-east, north or east of the plot. An overhead tank belongs in the south-west or west of the roof, raised above the slab. Keep all water storage out of the centre and the south-east.
Almost every independent house in Bengaluru has three water points: a sump that takes the municipal supply, a borewell for the dry months, and an overhead tank that the pump fills every morning. Many also have a rainwater pit. Each of them has its own place in Vastu, and the rule is not the same for water below the ground and water above the roof. Get this wrong at the foundation stage and it is one of the hardest things to change later, so it is worth five minutes before the excavator arrives.
The rule in one line
Water below the ground goes on the light side of the plot, and water above the roof goes on the heavy side. The north-east is the lowest, most open zone, so a sump or a borewell suits it. The south-west is meant to be the highest and heaviest, so the overhead tank sits there, adding weight where weight belongs.
| Water point | Best position | Acceptable | Avoid |
|---|---|---|---|
| Borewell | North-east zone of the plot | North or east | South-west, south-east, south, centre |
| Sump (underground tank) | North-east zone | North or east | South-west, south-east, centre |
| Overhead tank | South-west of the roof | West or south | North-east, centre, directly over the kitchen stove |
| Rainwater pit | North-east or north | East | South-west |
| Septic tank | North-west | West, away from the borewell | North-east, south-west, centre |
These positions are the same for every plot, but their weight is not the same for every owner. In a chart, water connects with the Moon and the 4th house, so I give a misplaced sump more attention when the owner’s chart puts stress there.
The borewell
The borewell is the deepest hole you will ever put in your plot, so its position carries the most weight of the three. I place it in the north-east zone, but a little to the north or east of the exact corner diagonal rather than on it. In practice the drilling rig also needs access, so I mark two or three acceptable spots on the plan and let the contractor choose between them. Keep the borewell well apart from the septic tank, which is a health rule as much as a Vastu one, and ask your plumber and civil engineer for the safe distance on your plot.
The sump
On a typical 30×40 or 40×60 site in Bengaluru, the sump usually goes under the front setback, because the BWSSB line comes in from the road. On a north or east facing plot this works out well, since the front is already the right side. On a south or west facing plot, the plumber’s easy answer puts the sump at the front, which is the wrong side. Run the supply pipe along the boundary to a sump in the north or east instead. It costs a little more piping, and it is far cheaper than moving a sump later. My guides to east-facing and west-facing houses show where the north-east falls on each.
The overhead tank
- Place it on the south-west part of the terrace, on a raised stand so it sits higher than anything else on the roof.
- The west or south is a reasonable second choice when the south-west is taken by the staircase head room.
- Never on the north-east of the roof, and not in the centre of the slab.
- Not directly above the kitchen stove or the pooja room.
- Fix overflow and leaks quickly. Damp patches spreading down the south-west wall are a problem in their own right.
Solar water heaters follow the same rule as the tank: south-west or south of the roof, never the north-east.
If yours is already in the wrong place
I start with what can change without digging. A sump in the south-east or south-west is kept tightly closed, leak-proof and clean, with nothing stored on its lid, and I balance the zone with weight and height above ground. An overhead tank on the north-east of the roof can often be shifted on its stand to the south-west, since it is only plumbing. When a new borewell is being drilled anyway, because the old one has dried, that is the moment to choose the right spot rather than drill beside the old one.
In an apartment
Flat owners do not choose the sump or the terrace tanks, and I do not count the building’s shared tanks against your flat in the same way. Inside the flat, keep drinking water and the purifier in the north or north-east of the kitchen, and fix any dripping taps in the north-east bathroom first. The rest of the room rules are in my Vastu for home guide, and if you are building, start with the plot buying checklist.
When the water plan meets the owner’s chart
A water point reading marks where the borewell, sump and tank should go. Adding the owner’s birth chart tells me how strict to be when the site does not allow the ideal spot, and which compromise is easier to live with for that person.
Here is an example. A sump forced into the south-west sits in Rahu’s corner. If the owner is entering a Rahu period, I would push harder to shift it before the foundation, and lean on weight above ground if moving it is not possible. The ₹1,499 plot or floor reading is the easy first step. For a new build where the chart should shape the plan too, I offer an Astro-Vastu consultation for the site and the owner.
Plan the water before the foundation
Send me the site plan with north marked, and the drawings if you have them. I mark the borewell, sump, overhead tank and septic tank positions in one 45-minute session for ₹1,499 per floor, online or at my studio in Begur, with the written report in 48 hours. An online plot reading is also ₹1,499, and site visits are quoted on request. Book before the digging starts, or read about my Vastu consultation in Bangalore.
Frequently Asked Questions
Can the sump be in front of the house as per Vastu?
It can, if the front of your plot is the north or east. On a south or west facing plot, the front is the wrong side for a sump. Bring the water line along the boundary to the north or east side instead, which costs only some extra pipe.
Which direction is best for a borewell?
The north-east zone of the plot, slightly off the exact corner diagonal, is the first choice. The north and the east are good second options. Avoid the south-west, the south-east and the centre. Keep the borewell well away from the septic tank for both Vastu and hygiene.
Can the overhead water tank be in the north-east?
No. The north-east of the roof should stay the lightest part of the house. An overhead tank there puts weight on the zone that should be open. Shift it to the south-west on a raised stand. Usually this is a plumbing job, not construction.
Is a sump in the south-east a big problem?
It is one of the placements I would avoid when building, because it puts water in the fire zone. If it is already there, I do not ask you to break it. Keep it closed, dry around the lid and with no leaks, and I will suggest balancing steps for that zone on your plan.
Where should the septic tank be in a Bangalore house?
The north-west is the usual choice, with the west as a second option. Keep it out of the north-east, the south-west and the centre, and well away from the borewell and the sump. Check the exact distance with your engineer, since soil and plot size vary.