- The island has a structural water deficit: annual demand of 4.06 billion m³ against 2.07 billion m³ of available groundwater; 90.81% of consumption goes to agriculture, fisheries and plantations. Data from the Bali Net Zero Emissions coalition, September 2026.
- Risks differ by regency: the south (Denpasar, Badung) — urban and coastal flooding; the highlands (Bangli, Karangasem) — landslides; the dry coast (Buleleng, north Karangasem, Klungkung) — drought and sea-level rise; agricultural zones (Tabanan, Gianyar, Jembrana) — watershed flooding.
- A high-emissions scenario brings permanent coastal inundation of more than two metres by 2045 — that is the horizon of a 69-year leasehold, not an abstraction.
- Climate risk is not a reason not to buy but a location filter and an engineering brief: plot elevation, drainage, water source, insurance cover.
- The check takes a day: elevation above the nearest watercourse, how the plot behaves in the rainy season, the water source and its resilience in the dry season, and policy cover for water and landslides.
In short: Bali has no "good" and "bad" districts by climate — it has different risks in different places, each with its own price in engineering and insurance. The south floods in downpours and faces coastal inundation, the highlands slide, the northern and eastern coasts dry out. On top of that the island has a structural water deficit: demand of 4.06 billion m³ a year against 2.07 billion m³ of available groundwater. Those figures and the risk map by regency were presented by the Bali Net Zero Emissions coalition at Bali Climate Week on 11 September 2026. Below: what follows for plot choice, the villa's engineering brief and the insurance policy, and the seven questions to ask before the deal. Where a villa gets its water and which permits that needs is covered separately in Water and utilities at a Bali villa; this piece is about location risk as a whole.
Water: why the deficit is structural
Bali's annual water demand is 4.06 billion m³. Available groundwater is 2.07 billion m³ a year. The gap is nearly twofold, and it is not tourism that closes it: 90.81% of consumption goes to agriculture, fisheries and plantations. Tourism contributes about 21% of gross regional product, and more than half of the island's economy depends on nature-based sectors — which is to say on the same water.
The practical consequence: competition for water will grow and regulation will tighten. That is exactly what the already-introduced permit regime for boreholes, with extraction reporting, looks like. For a villa owner it means "there is a borehole" is not an answer; the answer is "what happens to it in September, at the end of the dry season". In August 2026 water was already being trucked to the island's northern, eastern and western districts.
Sources: Bali Discovery, 14 Sep 2026 — per the Bali Net Zero Emissions Coalition (WRI Indonesia, IESR, New Energy Nexus, CAST Foundation, Azura), speaker Aisyah Madeleine; water-trucking data — The Bali Sun, 20 Aug 2026.
The risk map by regency
| Zone | Regencies | Principal risk | What it means for the plot |
|---|---|---|---|
| Urban and coastal south | Denpasar, Badung (Canggu, Seminyak, Kuta, Jimbaran) | Urban flooding, flash floods, coastal inundation | Elevation above the road and the nearest canal matters more than the view; stormwater and drainage are a mandatory line in the budget |
| Highlands | Bangli, Karangasem | Landslides, destabilised water sources | Slope geology and retaining walls; a water source can "walk away" after a heavy season |
| Dry coast | Buleleng, north Karangasem, Klungkung | Seasonal drought, coastal erosion, sea-level rise | Resilience of the water source in the dry season; setback from the shoreline |
| Agricultural zones | Tabanan, Gianyar (including the Ubud area), Jembrana, Klungkung | Watershed flooding, irrigation failures, landslides on terraces | How the plot sits relative to subak and irrigation channels; who is responsible for runoff upslope |
Note that the districts buyers want most — Canggu, Seminyak, Ubud — fall into two different risk categories. In the south it is water from above and from the sea; in Ubud it is water following the terrain and landslides on terraces. We compared the districts by market and lifestyle in Ubud or Canggu: where to buy a villa; the climate layer belongs on top of that.
The 2045 horizon and the leasehold term
The high-emissions scenario the coalition cites implies permanent coastal inundation of more than two metres by 2045. It is a model scenario, not a weather forecast, and should be read as such. But 2045 is the middle of a typical 69-year leasehold signed today.
For a beachfront plot the question is not "will it be beautiful" but "will the property remain usable in the second half of the term" — and "who buys it from you in 2040".
Hence a simple rule for the calculation: the closer the plot is to the shoreline and the lower its elevation, the larger the share of the price that must be explained by engineering rather than location — and the more important a plan to exit the property before the risk horizon. How a leasehold is sold before expiry, and what drives the discount, is covered in Selling a Bali leasehold before expiry.
How climate risk turns into an engineering brief
| Risk | Engineering response | Where it is checked |
|---|---|---|
| Flooding | Floor level above the road and canal, stormwater drainage, falls away from the house, site drainage | At handover — flood test and inspection in rain |
| Landslide | Geological report on the slope, retaining walls with drainage, water diverted off terraces | Before the deal — the report; after — the walls' condition in the first rainy season |
| Drought | Reserve water volume, source resilience, water treatment, a trucking contract | At the end of the dry season — actual yield and quality |
| Sea-level rise and erosion | Setback from the shore, salt protection for the foundation, a plan for the term | Cadastre and the coastal zone master plan |
Most of these items are checked once and for good — on handover day. The checklist across eight groups of systems, where water and waterproofing come first, is collected in Villa handover on Bali.
Insurance: what is covered and what is not
Climate risk ultimately comes down to the policy. Three things to read in it before signing: whether flood damage is covered as a separate peril or only "leaks"; whether landslide and ground movement are included; whether there is a cap on water damage and how the excess is calculated. In practice it is water and ground that most often sit in the exclusions of a standard policy for a tropical house. How villa insurance works and which risks are actually covered is covered in Insuring a villa on Bali.
Seven questions before the deal
- What is the plot's elevation relative to the nearest watercourse, road and canal — and where does the water go in a downpour?
- What did the plot look like in the last rainy season — are there photos, marks on neighbouring walls, neighbours' accounts?
- Where does the water come from — borehole, mains, trucking — and what is the yield at the end of the dry season?
- Is there a geologist's report on the slope, and do the retaining walls have drainage?
- What is being built upslope, and how will it change the runoff in a year?
- How far is the shoreline, and what does the master plan say about the coastal strip?
- What exactly in the policy covers water, ground and flooding — and with which exclusions?
These questions are part of a wider check of the property — from land and permits to the developer and the contract. The full procedure is collected in Villa due diligence on Bali; zoning and what can be built on a given plot is in Land zones in Bali.
Bottom line: climate risk in Bali is not an argument against buying but a location filter and an engineering brief. The island has a structural water deficit (4.06 against 2.07 billion m³ a year), and the risks are distributed by regency: flooding in the south, landslides in the highlands, drought in the north and east, watershed floods in the agricultural zones. The 2045 horizon is the middle of a 69-year leasehold, so a coastal plot's price should be explained by engineering, not only by the view. The check fits into a day and seven questions; the costliest things to miss are water from above, water from below, and its absence in September.
This material is informational only and is not an engineering, insurance or legal opinion. Climate scenarios are cited from the source as model scenarios; assessment of a specific plot is done by a qualified specialist.
FAQ
How serious is Bali's water deficit?
According to the Bali Net Zero Emissions coalition, speaking in September 2026, the island's annual water demand is 4.06 billion m³ while available groundwater is 2.07 billion m³ a year. The gap is structural: 90.81% of consumption goes to agriculture, fisheries and plantations, and tourism competes for what is left.
Which areas are more prone to flooding?
The urban and coastal south — Denpasar and Badung: urban flooding, flash floods and coastal inundation. The agricultural zones of Tabanan, Gianyar, Jembrana and Klungkung — watershed flooding and irrigation failures.
Where is landslide risk higher?
In the highlands — Bangli and Karangasem: steep slopes and destabilised water sources. Landslides are also noted for agricultural zones with terraced terrain.
Where is drought worst?
On the dry coast — Buleleng, north Karangasem, Klungkung: seasonal drought, coastal erosion and sea-level rise. In August 2026 water was already being trucked to northern, eastern and western districts.
What does this mean for a 69-year leasehold?
The 2045 horizon is the middle of a typical contract term. A high-emissions scenario implies permanent coastal inundation of more than two metres. For a beachfront plot that is a question not of aesthetics but of whether the property remains usable.
What should be checked on the plot before the deal?
Elevation above the nearest watercourse and the slope; the plot's condition in the rainy season; the water source and how it behaves in the dry season; drainage and stormwater; insurance cover for water and landslides; and how neighbouring construction changes the runoff.