In most outer-corridor communities across Chennai, Hyderabad and Bengaluru, water comes from borewells plus tankers rather than a municipal line. The single most useful number is last year's tanker spend from the audited association accounts. Ask for it before you book.
Key facts
- Ask about April, not November. Dry-season yield is the only borewell figure that means anything.
- The tanker line item in last year's audited accounts is the most honest water disclosure available, and the sales office will not have it. The association will.
- STP capacity should be read against the full unit count, not the current one. An STP sized for phase one serving three phases is a common and expensive failure.
- Maintenance typically rises at handover, because the developer often subsidises it while still selling. Ask for the post-handover figure in writing.
- Amenity count and maintenance cost are the same number seen from two directions. A 200-amenity community has a 200-amenity bill, permanently.
- In a completed community you can get real figures instead of projections — which is the strongest argument for buying finished stock.
- "Rainwater harvesting provided" means pits exist. Ask when they were last desilted; unmaintained pits do nothing.
Where does a gated community's water actually come from?
Usually three sources, in this order of preference and reverse order of reliability.
A municipal connection — Metrowater in Chennai, the Water Board in Hyderabad, BWSSB in Bengaluru. Cheapest and most reliable where it exists. Across the outer corridors where most new large communities are built, it frequently does not, or it exists on a schedule rather than continuously. "Applied for" is not connected, and an application can sit for years.
Borewells. The default for most outer-corridor communities. What matters is not how many there are but what they yield in the dry months, and how deep they have had to be drilled over time. A community that has deepened its borewells twice in five years is telling you something.
Tankers. The gap-filler, and the most expensive water you will ever buy. Tanker dependence is not a disgrace — plenty of well-run communities use tankers in summer. What matters is how much, how predictably, and what it costs per home per year.
Most communities use some combination. The honest question is not "is there water" but "what is the mix, and what does the expensive part cost".
What should I ask about water and maintenance before I buy?
Eight questions. Take them to the resident association where one exists, and to the developer where one does not — and note which questions each is willing to answer.
| What to ask about | The question | Why it matters |
|---|---|---|
| Borewell yield and depth | How many borewells, at what depth, and what do they yield in April? | April, not November. Yield in the dry months is the only number that matters, and it should come from the association, not the sales office. |
| Municipal connection | Is the community on the municipal line, and on what schedule? | Many outer-corridor communities in Chennai and Hyderabad are not. "Applied for" is not connected. |
| Tanker spend | What did the community spend on tankers last financial year? | This single figure tells you more about water security than any brochure. Ask for the line item in the audited accounts. |
| STP capacity vs units | What is the sewage treatment plant rated for, against how many homes? | An STP sized for the first phase and serving three phases is a recurring failure across large townships. |
| Treated water reuse | Is STP output reused for landscaping and flushing, and is it working? | Designed-for and operating are different. Ask to see it running. |
| Rainwater harvesting | How many recharge pits, and when were they last desilted? | Pits that have never been desilted do nothing. Ask for the maintenance record. |
| Maintenance per sq ft | What is it today, and what will it be after handover? | The developer often subsidises maintenance while it is still selling. The post-handover figure is the real one. |
| Sinking fund balance | What is held against lifts, pumps, painting and waterproofing? | A thin fund means a special levy, and it lands on whoever owns the flat when it is called. |
Why does the sewage treatment plant matter so much?
Because it is the piece of infrastructure most likely to be undersized, and the consequences are both unpleasant and expensive.
A sewage treatment plant is rated for a certain load. In a phased township, the plant is often built to serve the first phase and then asked to serve all of them. When it is overloaded, three things happen: treatment quality drops, odour becomes a standing complaint, and the community ends up paying to augment capacity — a capital cost that arrives as a special levy.
There is a second reason to care. Treated STP output is meant to be reused for landscaping and toilet flushing, which materially reduces how much fresh water the community needs to buy. A plant that is designed for reuse but not actually plumbed for it, or not running, means you are buying tanker water to water the gardens.
What will maintenance actually cost after handover?
More than you are quoted, in most cases, and the reason is structural rather than dishonest.
While a developer is still selling units, it typically runs and part-subsidises maintenance. A low maintenance figure is a good selling point, and the cost of carrying it is small against the revenue from unsold inventory. When the last units sell and the developer hands over to the resident association, that subsidy ends and the association discovers the real number.
So the question is not "what is maintenance" but "what will maintenance be once the association runs it, and has that figure been modelled?" Ask for it in writing. If nobody can answer, that is itself the answer.
Three things drive the post-handover figure:
- The amenity programme. A clubhouse, pool, gym and landscaped grounds need staffing, power, water and repair every month forever. An amenity count is a cost commitment described as a feature.
- Density. More homes spread the same fixed cost across more payers. A 2,000-home community and a 200-home community with the same clubhouse have very different per-home bills. This is the one place where high density works in your favour.
- The sinking fund. Lifts, pumps, external painting and waterproofing all come due on a cycle. A fund that was never properly built means those arrive as levies.
Does any of this get better over time, or worse?
Both, and which one depends almost entirely on the association rather than the developer.
Gets better: municipal connections do eventually arrive in some corridors. Borewell recharge improves measurably where rainwater harvesting pits are genuinely maintained. Well-run associations negotiate better tanker rates at volume and bring per-home costs down.
Gets worse: borewell yields decline as an area densifies and more communities draw on the same aquifer — this is the structural trend across the Miyapur–Bachupally belt and much of OMR. An STP that was marginal at full occupancy does not improve. And deferred maintenance compounds; a community that skipped waterproofing for three years pays several times over later.
Which is why the association accounts matter more than the building. You are buying into a small organisation that will spend your money for decades. Read its books before you join it.
The honest downside of all this diligence: most of it is only available in a community that already exists. If you are buying off a plan, the tanker spend, the post-handover maintenance rate and the sinking fund balance are all projections, and a projection made by the party selling to you carries obvious risk. In that case, do the next best thing: ask the same eight questions about the developer's nearest completed project, and treat the answers as the realistic case for yours.
This guide is general and the figures it discusses vary enormously between communities, corridors and years. Nothing here substitutes for reading the actual audited accounts of the actual community you are considering, and verifying the project's registration on the state RERA portal. Where a number is given to you verbally, ask for it in writing.
Questions buyers ask
Answered from this page's own research. Last reviewed 3 November 2026 by the PropIQ World research desk.
What is the most important water question to ask before buying a flat?
What the community spent on water tankers last financial year, and whether you can see that line in the audited accounts. Everything else about water security is downstream of that figure, and unlike a brochure claim it cannot be rewritten. The sales office will not have it; the resident association will.
Do gated communities in Chennai and Hyderabad have municipal water?
Many outer-corridor communities do not, or have it only on a schedule. Across OMR in Chennai and the Miyapur–Bachupally belt in Hyderabad, communities typically run on borewells plus tankers with an on-site sewage treatment plant. Note that 'applied for' is not connected, and an application can sit for years.
How do I judge whether borewells are adequate?
Ask about April, not November — dry-season yield is the only figure that means anything. Ask how many borewells there are, at what depth, and whether they have been deepened since the community was built. A community that has deepened its borewells twice in five years is telling you about the aquifer.
Why does the STP capacity matter?
Because it is the infrastructure most likely to be undersized. In a phased township, a plant built for phase one often ends up serving all phases. Overloaded, treatment quality drops, odour becomes a standing complaint, and augmenting capacity arrives as a special levy. Ask what the plant is rated for against the full unit count, not the current one.
Can I ask to see the sewage treatment plant?
Yes, and you should. Ninety seconds walking past it tells you whether it is running, whether it smells, and whether the treated-water line actually goes anywhere. Treated output is meant to be reused for landscaping and flushing, which cuts how much fresh water the community buys. A developer who will not show you the STP has answered a different question.
Will maintenance charges go up after the developer hands over?
Usually. While a developer is still selling units it typically part-subsidises maintenance, because a low figure is a good selling point. That subsidy ends at handover to the resident association. Ask what the post-handover figure is modelled to be, in writing. If nobody can answer, that is the answer.
Does a bigger amenity package mean higher maintenance?
Directly. A clubhouse, pool, gym and landscaped grounds need staffing, power, water and repair every month, permanently. An amenity count is a cost commitment described as a feature. Density partly offsets it — more homes spread the same fixed cost across more payers, which is the one place high density works in your favour.
What is a sinking fund and why should I care?
A reserve held for major periodic works: lifts, pumps, external painting and waterproofing. These come due on a cycle whether or not the money was saved. A thin fund means those costs arrive as special levies, and a levy lands on whoever owns the flat when it is called — which may be you, not the person who sold to you.
Does water supply get better or worse over time?
Both. Municipal connections do eventually arrive in some corridors, maintained rainwater harvesting measurably improves recharge, and well-run associations negotiate better tanker rates. Against that, borewell yields decline as an area densifies and more communities draw the same aquifer, and deferred maintenance compounds expensively.
Is it easier to check all this in a completed community?
Far easier, and it is the strongest practical argument for buying finished stock. In an occupied community you can read audited accounts, see the actual tanker spend, walk past the STP, and ask three residents what April is like. Buying off a plan, every one of those is a projection.