Property Near a Lake in India: How to Check the Buffer Zone and FTL Before You Buy (2026)

In short (2026): A clean title, a clean encumbrance certificate (EC) and even a khata in the seller's name will not tell you whether a plot sits inside a lake's Full Tank Level (FTL) or its protected buffer. Those are environmental and town-planning restrictions that never touch the property register, so a plot with perfect ownership papers can still be a no-construction zone that authorities are demolishing. To check officially: in Hyderabad, look the lake up on the HMDA lakes portal (lakes.hmda.gov.in) and run the survey number through the Bhu Bharati prohibited-property search; in Bengaluru, obtain the village map and survey sketch that show the tank (kere) boundary and FTL for that survey number and cross-check it against the plot, because there is no single-click Karnataka portal and the definitive answer comes from a licensed surveyor measuring your plot against the notified FTL line.

If you remember one thing: the register records who owns the land, never whether the land is allowed to be built on. An EC can be spotless and the plot still be un-buildable.

Why a clean title and a clean EC don't tell you if you're in the buffer zone

This is the trap, and it is where a careful buyer beats a checklist.

An encumbrance certificate, issued under the Registration Act, 1908, lists only what has been registered against a property: sales, mortgages, gifts, leases, court attachments. It has no field for zoning, land use or environmental status, and it never did. Whether a plot falls inside a notified water body's FTL or its buffer is decided in an entirely different set of records, held by the irrigation, revenue and town-planning departments, not by the sub-registrar. The two systems do not talk to each other.

So a plot can carry a valid registered sale deed, a "nil" EC, and a khata or RTC in the owner's name, and still sit squarely inside a lake bed or its buffer. The ownership is real. The problem is that the land itself is protected: construction on it is prohibited, and any structure already there is liable to be pulled down. A building-plan approval issued in error does not fix this either; approvals given against the FTL have been overridden by later findings.

This is why the standard three-document check that most buyers and even some brokers rely on, title deed plus EC plus approved plan, is blind to the single risk that can make the land worthless. You have to check the water-body records separately, on purpose.

What FTL and the buffer zone actually are

FTL, the Full Tank Level, is the maximum level water spreads to in a lake or tank before it overflows through its weir or surplus course. It is not an estimate or a private opinion. For any specific water body the FTL is fixed by field survey and record, reckoned by the irrigation and revenue departments and captured in the tank register, the village map and the FTL sketch. When someone tells you a plot is "near the lake," the question that matters is where the plot's survey boundary falls relative to that surveyed FTL line, not how far the water happens to be on the day you visit.

The buffer zone is a belt around the FTL where construction is restricted or barred outright, set aside so the water body can breathe, drain and recharge. Development inside the water body itself is prohibited by statute: Telangana's Building Rules 2012, for example, bar any development "in the bed of water bodies like a river or nala and in the Full Tank Level (FTL) of any lake, pond, cheruvu or kunta."

Behind all of this sits the public trust doctrine: the Supreme Court has long held that the state holds natural water bodies in trust for the public and cannot allow them to be privatised or built over (M.C. Mehta v. Kamal Nath, 1997), a principle the Court reaffirmed and extended to man-made and artificial water bodies again in 2025 (Swacch Association, Nagpur v. State of Maharashtra, 2025 INSC 1199). That is the legal backbone under every buffer notification and demolition drive below.

How far is the buffer? Why "75 metres or 30 metres?" is the wrong question

Buyers routinely ask it exactly this way. One real question on a public forum reads: "How much is the buffer zone for an apartment getting constructed next to a lake in Bangalore, 75 metres from the edge of the lake or 30 metres?" The honest answer is that there is no single national number. The buffer depends on the state, on the type of water body (a lake is treated differently from a rajakaluve or nala), and, increasingly, on the size of the water body. You have to find the rule that governs your lake.

Bengaluru and Karnataka

There are two live regimes, and a buyer must know which one applies.

The benchmark that most enforcement disputes still turn on comes from the National Green Tribunal. In a 2016 order arising from a Bengaluru wetland case, later upheld by the Supreme Court (which applied it prospectively, so buildings predating it are not automatically illegal), the Tribunal set: 75 metres as the buffer from a lake or wetland, and 50, 35 and 25 metres from primary, secondary and tertiary rajakaluves (stormwater drains). These are the figures courts and civic authorities reach for when a construction near a Bengaluru lake is challenged.

Separately, a Karnataka state law notified in February 2026 (an amendment to the Karnataka Tank Conservation and Development Authority Act, 2014) sets smaller, size-tiered buffer minimums for tanks under the authority's administration, scaling roughly with the size of the tank and the parcel. The exact bands and, in particular, whether they are a brand-new scheme or an existing one being relaxed are reported inconsistently, so verify the current position for your specific tank rather than trusting a blog table. The two points that are clear: Bengaluru's large lakes (broadly, those above 100 acres) stay at the existing 30 metre buffer, and the relaxation is aimed at small tanks and small parcels, some of which may carry little or no mandatory buffer. The tank authority's jurisdiction today extends across the state, including tanks inside BBMP and BDA limits.

Net: do not assume a single distance. Establish whether your lake is governed by the NGT benchmark, the state tank-authority tiers, or both, before you read any distance as safe.

Hyderabad and Telangana

Construction inside the FTL is barred outright by the Building Rules 2012. A no-construction buffer belt is then measured from the FTL line; the figure commonly cited for larger Hyderabad lakes is around 30 metres, with a narrower belt for minor water bodies and nalas, but because the exact width is set water body by water body, confirm it for your specific lake rather than assuming one number. The Telangana Water, Land and Trees Act, 2002 (WALTA) gives the authorities power to designate water bodies as protected, mark their boundaries permanently, and remove encroachments.

One more Hyderabad-specific restriction catches many buyers: GO 111, issued in 1996, prohibits polluting and built development across a 10 kilometre catchment around the Osman Sagar and Himayat Sagar reservoirs. A 2023 decision to repeal it was put on hold later that year and remains under review, so as of 2026 GO 111 has not been repealed. Treat it as in force and check its current status, because it is politically live and a plot inside that catchment carries a restriction that has nothing to do with its title.

How to check officially in Hyderabad

Telangana is the easier of the two because the state built a portal for exactly this.

1. Open the HMDA lakes portal at lakes.hmda.gov.in. Search by district, mandal, village or lake name. For each listed lake it shows the lake ID, the FTL and cadastral maps, the bund details and, crucially, the survey numbers that fall within the FTL and the buffer. If your plot's survey number appears there, that is your answer.
2. Run the survey number through the prohibited-property search on Bhu Bharati (bhubharati.telangana.gov.in). Telangana replaced the old Dharani portal with Bhu Bharati in April 2025 under the Telangana Bhu Bharati (Record of Rights in Land) Act, 2025; the old Dharani prohibited-property links no longer resolve. A survey number flagged as prohibited (including under water-body or GO 111 grounds) is a stop sign.
3. Cross-check visually on Bhuvan (bhuvan.nrsc.gov.in), ISRO's satellite-imagery platform, to see where the plot sits relative to the water spread. Treat this as a supporting visual check, not a legal certificate.

If the HMDA portal shows your lake and your survey number is clear of both the FTL and the buffer, you are in a strong position. If the survey number is inside either, no amount of clean title paperwork changes the exposure.

How to check officially in Bengaluru (there is no one-click portal)

Karnataka has no single public tool equivalent to the HMDA lakes portal, at least none surfaced in this review, so the check is manual and it is worth doing properly.

1. Get the village map, tippani and survey sketch from the Survey Settlement and Land Records department for the survey number. These show the kere (tank) boundary and, where surveyed, the FTL contour, which is what you compare the plot against.
2. Pull the RTC (Pahani) on Bhoomi (landrecords.karnataka.gov.in) to confirm ownership and land classification, but remember the RTC is a revenue ownership record and does not itself show FTL or buffer status, the same blind spot as the EC.
3. Check the tank authority's records (ktcda.karnataka.gov.in) for lakes under its jurisdiction, including within the city.
4. For a definitive answer, engage a licensed surveyor to physically measure the plot's boundary against the notified FTL and the applicable buffer distance. Because the buffer width in Karnataka now depends on the water body's size and which regime governs it, a measurement on the ground against the notified line is the only reliable way to know whether a specific plot clears it.

What happens if the plot is in the FTL or buffer

Enforcement is no longer theoretical, and this is the part that has changed the calculus for buyers.

In July 2024 Telangana set up HYDRAA, the Hyderabad Disaster Response and Assets Monitoring and Protection Agency, with a mandate to identify and remove encroachments on lakes, ponds, nalas and other public assets. In August 2024 it demolished a well-known 10-acre convention centre in Madhapur on the finding that it encroached the FTL of a lake, even though the owner asserted the land was patta (clean revenue title) and pointed to a stay. That single case is the clearest illustration of the rule this article is built on: a clean title is not a buffer-zone clearance. By its own account HYDRAA reclaimed over 100 acres by demolishing more than 260 structures in its first hundred days. Bengaluru has seen the same pattern from the other direction, with NGT-driven eviction notices and demolitions of structures on lake beds and stormwater-drain buffers.

The prospective-application point matters for tone, not for comfort. Buildings that genuinely predate the 2016 NGT order are not automatically illegal, but a buyer purchasing today, or planning to build today, gets none of that protection, and encroachment on the FTL bed itself has no such grace. If you are buying now, you are firmly on the wrong side of that line if the plot is inside the FTL or buffer.

Before you pay: the buffer-zone checklist

• Ask for the survey number early and check it against the water-body records yourself, do not rely on the seller's "it's not in the buffer."
• In Hyderabad, confirm the survey number on lakes.hmda.gov.in and the Bhu Bharati prohibited-property search, and check whether the plot falls in the GO 111 catchment.
• In Bengaluru, get the village map and survey sketch showing the kere boundary, and have a surveyor measure the plot against the notified FTL and buffer.
• Treat a "nil" EC, a valid deed and a khata as necessary but not sufficient: none of them speaks to FTL or buffer status.
• If any record shows the survey number inside the FTL or buffer, walk away or get written, verifiable clearance from the water-body authority, not a builder's assurance.

Frequently asked questions

Can a property inside the buffer zone still be registered and get a khata? Yes, and that is exactly why buyers get caught. Registration and mutation happen in the revenue and registration systems, which do not check FTL or buffer status. A plot inside a buffer can be sold, registered and khata-transferred with paperwork that looks completely clean, while remaining un-buildable and demolition-liable. Clean registration is not zoning clearance.

Does the encumbrance certificate show whether a plot is in the FTL or buffer? No. An EC records only registered transactions against the property under the Registration Act, 1908. FTL and buffer status live in the irrigation, revenue and town-planning records. You must check those separately; the EC will never surface the risk.

Is 75 metres or 30 metres the correct lake buffer in Bengaluru? It depends on which rule governs your lake. The 75 metre figure (with 25 to 50 metres for stormwater drains) is the National Green Tribunal benchmark that enforcement disputes use. A February 2026 state amendment separately sets smaller, size-tiered minimums for tanks under the tank authority, while keeping large Bengaluru lakes at 30 metres. Establish which regime applies to your specific lake rather than assuming one number.

Is GO 111 still in force in Hyderabad in 2026? As of writing, yes. A move to repeal it in 2023 was put on hold later that year and is under review, so no repeal has taken legal effect. Treat GO 111 as live for any plot in the Osman Sagar or Himayat Sagar catchment, and verify its current status before you commit.

I bought or built near a lake years ago, is my house automatically illegal? Not automatically. The NGT buffer order was applied prospectively by the Supreme Court, so genuinely older structures are not illegal simply for predating it. But that grace does not extend to construction inside the FTL bed, and it does not help someone buying today. If you are purchasing now, verify the FTL and buffer position for the exact survey number.

How do I check the FTL for a specific Hyderabad plot? Search the lake on lakes.hmda.gov.in, where the FTL and cadastral maps list the survey numbers inside the FTL and buffer, and run the survey number through the Bhu Bharati prohibited-property search. Use Bhuvan satellite imagery as a visual cross-check.

The bottom line

A property near a lake can have flawless ownership papers and still be a demolition waiting to happen, because title and buffer status live in different registers that never reconcile. The check that protects you is the one most buyers skip: take the survey number to the water-body records, the HMDA lakes portal and Bhu Bharati in Hyderabad, the village map, survey sketch and a surveyor in Bengaluru, and confirm the plot clears the notified FTL and buffer before any money moves. A clean EC tells you the land was not mortgaged. It says nothing about whether you will be allowed to keep what you build on it.

If you would rather not assemble that yourself, a LegiScore title report reads the full title chain and flags water-body, FTL and buffer exposure alongside the EC, litigation and prohibited-property checks, in one rated report. Get a property title report.

Related reading: Telangana encumbrance certificate online guide · Karnataka encumbrance certificate online guide (Kaveri 2.0) · How to read a sale deed before buying · Agricultural land purchase: the legal checks · Flat and apartment due-diligence checklist · Title search report format and 30-year TSR sample

This article explains a general legal and regulatory position and is not legal advice for your specific transaction. Buffer distances, portal features, GO 111's status and the February 2026 Karnataka amendment can change; verify the current rules and the position of your exact survey number with the relevant authority, and consult a qualified professional for your property.