Walk onto almost any construction site in India and ask where the overhead tank is going. The answer will be southwest. Ask why, and you will get a version of sab yehi rakhte hai — everyone puts it there.
That rule is roughly thirty to forty years old. Nobody can identify where it came from. And the Vastu scriptures say the opposite.
Water belongs in the north, northeast or west. Not the southwest.
The rule underneath the rule
The scriptures work from a single principle, and once you have it, most of the placement guidance follows on its own:
Keep water at the coolest point of the plot.
That is it. The sun rises in the east and travels inclined toward the south across the day. At night it is on the northern side. So the northern part of a plot is consistently the coolest, and that is where water belongs.
The full guidance:
- Favourable — east, north, northeast, west
- Excluded — southwest, south, southeast, northwest
- Never — in the middle of the house
Why the southwest is the worst option
The scriptural language is severe. Water in the southwest is associated with the death of the owner and with friction between the women of the household.
But the book gives a physical mechanism too, and it is worth more than the warning.
Southern sun is strong. A tank in the southwest heats up. Household members then drink, bathe and cook with warm water. In Ayurvedic terms this raises pitta dosha — the fire of the body — and raised pitta shows up as anger.
Chapter 16 of the Bhagavad Gita names three things that destroy a person: lust, greed and anger. A tank position that quietly and continuously feeds the third of these is not a small matter.
Notice this is testable. It has nothing to do with belief. A black plastic tank baking in southwestern sun produces hot water, and a household drinking warm water in a hot climate is a household with shorter tempers. The scriptural claim and the physical claim point the same way.
What about the many people who have a southwest tank and are doing fine? The book allows for this directly. A strong birth chart can carry it, or a Griha Pravesh performed on a strong day. But the position is still working against the owner's growth rather than for it.
If your tank is already in the southwest
Here is where the advice becomes unusually practical: do not spend money moving it.
Place a silver tortoise or silver crocodile inside the tank. If you cannot find one, a silver coin will do.
The logic is straightforward — silver is known for its cooling properties, and the problem you are solving is heat. The remedy addresses the actual mechanism rather than gesturing at it.
When to build a water body
Water is treated with the same seriousness as a house or a temple, and the timing guidance reflects that.
Days to avoid:
- Sunday — the reservoir dries up
- Tuesday — the water drains out
- Saturday — the water gets polluted
Every other day is suitable.
Auspicious nakshatras: Rohini, all three Uttara nakshatras, Pushya, Anuradha, Shatabisha, Magha, Dhanistha and Shravan.
In the Gochar Kundli, begin when the ascendant is Aries, Gemini, Leo, Libra or Sagittarius — the odd-numbered, masculine signs — ideally with an auspicious planet such as Jupiter aspecting the ascendant. Aquarius ascendants are excluded.
For inauguration: the Sun in Uttarayan, the Sun sign in Scorpio, any month except Chaitra, a full moon night, avoiding Rikta tithi, on the day of an auspicious planet.
Foundation-laying for a water body begins from the northeast, after paying homage to Nanda and the other stones and praying in all directions.
Shape matters
Water takes the character of the vessel holding it, so the vessel's form is not incidental:
- Supreme — triangular, square, round
- Medium — bow, vase, pitcher
- Undesirable — snake, serpent and flag shapes
The Jaipur site
On a project in Jaipur, the architect had specified the tank in the southwest. He was also acting as the site's Vastu consultant, which is its own problem — three surgeons operating on one heart, and the heart is doomed.
Asked what was planned for the southwest, the client said an overhead tank, because everyone keeps it there. The internet said so. His architect said so.
What changed his mind was not authority. It was being shown the verses. The tank went north.
That is the whole method: which verse? If nobody can answer, the rule is not Vastu. It is repetition.
One more thing about water
The scriptures hold that anyone who builds a public water reservoir is blessed — they enjoy the company of Lord Vishnu for as long as water exists on Earth. Vishnu sleeps on the ocean upon Ananta. The Bhudhar pada lies in the north, which is part of why water in the north is auspicious.
If you are building a tank anyway, there is a version of this act that extends beyond your own boundary wall.
Vāstu Remedies: Manifest Your Dreams covers water bodies in full, along with 34 other remedies — each with its verse, its reasoning, and a procedure you can carry out yourself. For the source material, see The Ancient Science of Vāstu I, whose eighth chapter is devoted to reservoirs, wells and tanks.
This is part of a series on Vastu myths. Start with 35 Vastu Myths, and What the Scriptures Actually Say, or read Is the Northeast Entrance Really the Best?
