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Fab water recycling at Dholera
Semiconductor fabs use very large volumes of water, most of it purified to an extreme standard called ultrapure water, to rinse and clean wafers between the hundreds of process steps. Because that demand is so heavy, modern fabs invest in treating and recycling water to reduce how much fresh water they draw. Dholera was planned as a smart city with a recycled-water network, wastewater and effluent lines and a water treatment plant of about 50 MLD with reservoirs in its Activation Area (the first phase of Dholera to get roads, water, power and drainage), the kind of water backbone a fab depends on.
Last checked 2026-08-11 · every figure below carries its source
Why fabs need so much water
Water is one of a fab's most important raw materials. Throughout chip making, wafers must be rinsed and cleaned constantly, because any residue, particle or chemical left behind between steps can ruin the delicate circuits being built. With hundreds of process steps on a single wafer, and thousands of wafers moving through a fab, the cumulative water demand is enormous. A high-volume fab is one of the largest industrial water users in its region. This is not ordinary tap water either. Most of it must be purified to an exceptional standard known as ultrapure water, stripped of minerals, particles, dissolved gases and microbes, because even trace impurities would leave deposits on the wafer surface. Producing ultrapure water is itself an energy and equipment intensive process. Because of all this, water supply and water management are central considerations when siting and operating a fab, and they are a major reason a fab must be built where a reliable, well-managed water system exists.
What ultrapure water is
Ultrapure water is water that has been cleaned far beyond drinking standards. Ordinary water, even clean tap water, contains dissolved minerals, tiny particles, dissolved gases, organic matter and microorganisms. For chip making, almost all of these must be removed, because they would leave residues or defects on wafers whose features are measured in nanometres. Producing ultrapure water involves multiple stages of filtration, membrane processes that strain out dissolved substances, treatments to remove dissolved gases and steps to eliminate any biological growth. The result is water so pure that it would actually be unhealthy to drink over time, because it aggressively absorbs minerals. Making ultrapure water requires significant energy and equipment, so it adds to a fab's running costs and its environmental footprint. This is one reason fabs work hard to reuse water rather than treat fresh supply from scratch every time, since recovering and reconditioning water they have already purified can be more efficient than starting over.
How fabs recycle water
Because their water demand is so heavy, modern fabs treat water recycling as essential rather than optional. After water has been used to rinse wafers, much of it is only lightly contaminated and can be collected, treated and reused, either back in the process or for other purposes such as cooling and utilities. Different waste streams are kept separate according to how they were used and what they contain, so that the cleaner streams can be recovered more easily and the more contaminated streams can be treated appropriately before release. Advanced fabs can recycle and reuse a large share of their water, substantially reducing how much fresh water they draw from the surrounding supply. This recycling depends on a well-designed system of collection pipes, treatment plants and storage, both inside the fab and in the surrounding infrastructure. A fab located in a place with a strong recycled-water network and wastewater treatment can achieve better water efficiency than one that has to build every part of that system in isolation.
Why water recycling matters for a region
A fab's water footprint is not just its own concern, it affects the whole region around it. Drawing very large volumes of fresh water can strain local supplies, especially in areas that are dry or where water is already in demand for farming and homes. Recycling water within the fab reduces that strain, and treating wastewater properly protects local rivers, groundwater and coastal environments from contamination. For a region trying to attract manufacturing while remaining livable and sustainable, a robust water and wastewater system is therefore a shared asset that benefits industry and residents alike. This is one reason planned industrial cities build water infrastructure into their master plans from the start, rather than leaving each factory to fend for itself. A well-managed water cycle, from supply through use to recycling and treatment, is part of what makes a place suitable for water-intensive industries like semiconductor manufacturing over the long term.
Dholera's water infrastructure
Dholera was planned as a greenfield smart city with water management built into its design, which is the kind of backbone a fab needs. According to a DICDL (Dholera Industrial City Development Limited, the company that builds the city) official account of the Activation Area, the phase-1 zone, the built-out utilities include a piped potable water network with smart meters and leak detection, a separate recycled-water network, dedicated wastewater and effluent lines, and a water treatment plant of about 50 MLD along with reservoirs. Stormwater is channelled into a man-made canal reported at 6.5 km. This separation of potable, recycled and wastewater into distinct networks is exactly the arrangement that supports efficient water use and recycling for large industrial users. It means a fab in Dholera can, in principle, draw on managed supply and feed into treatment and reuse systems rather than building its entire water cycle alone. Note that some longer-range or promotional water elements, such as desalination or a common utility tunnel, are not officially confirmed and should be treated as planned rather than built.
Water and the Dholera fab in context
For the Tata Electronics and PSMC fab at Dholera, the region's water infrastructure is part of what makes the location workable. A fab of its scale, targeting up to 50,000 wafers per month, will be a significant water user, and it depends on reliable supply, the ability to produce ultrapure water and a system to treat and recycle what it uses. The publicly documented Dholera facts describe the smart-city water network, the recycled-water system and the roughly 50 MLD treatment plant in the Activation Area, which is where the fab is being built. Specific figures for the fab's own water consumption or recycling rate are not in the public fact base, so they should not be stated, and any such numbers should be described qualitatively as large rather than invented. The honest overall picture is that Dholera provides a planned water backbone suited to industry, while the fab itself remains under construction, with first trial silicon targeted around December 2026.