How Much Water Does It Take to Make a Computer Chip? More Than a Whole City Uses

If you want to find AI’s real water problem, don’t look at the chatbot. Look at the factory that builds the chip behind it.

A single modern chip fabrication plant can use about 10 million gallons of ultrapure water a day, which the World Economic Forum puts on par with the daily water use of 33,000 U.S. households. Individual fabs range from roughly 2 to 10 million gallons a day depending on size and what they make. Back in 2021, the nonprofit China Water Risk estimated an average chip factory drinks about 20,000 tons of water a day, roughly what a city of 58,000 people would use. The exact figure shifts with how you measure it, but every credible source lands in the same place: this is one of the thirstiest manufacturing processes on earth.

Why a chip needs so much water

It comes down to cleanliness. Chips are etched at scales where a single speck of contamination ruins the product, so fabs rinse wafers over and over in something called ultrapure water. This isn’t tap water. It’s stripped of nearly everything. One water-treatment executive described the target purity as parts per quadrillion, like a single molecule of impurity in an Olympic swimming pool. As an Arizona State University engineering professor put it, water is the largest-volume chemical used in semiconductor manufacturing. Making it pure enough is its own industrial process, which is part of why the volumes get so big.

When the water runs out, the chips stop

This isn’t a hypothetical risk. In 2021, Taiwan hit its worst drought in more than 50 years after the island saw zero typhoons make landfall in 2020 for the first time in roughly half a century. The reservoirs that TSMC, the company that makes most of the world’s advanced chips, relies on ran low. The company’s response tells you how essential the water is: tanker trucks rolled up to its factories, each hauling about 20 tons of water at around $1,000 a load, to keep production lines running.

The strain didn’t stay inside the factory gates. Taiwan’s government rationed water, and for several years running, rice farmers in the south were told not to plant their crops so the water could go to the fabs instead. That’s the uncomfortable trade at the heart of this story. When a drought forces a choice between farmers and chip factories, the chips tend to win, because the global economy depends on them. One analysis warned that poor water management could cut TSMC’s output 10 percent below its 2030 projection, and noted the company’s water use jumped 70 percent between 2015 and 2019 as chips got more advanced.

The part that complicates the outrage

Here’s where it gets more honest than the usual “factories are draining the planet” take. Chipmakers reuse a lot of this water, and they’re getting better at it fast.

TSMC says its global wastewater recycling topped 140 million cubic meters in 2024, and the company has set a goal of 100 percent reclaimed water systems by 2040. At its new Arizona plant, TSMC currently reuses about 65 percent of its wastewater, and a reclamation plant due in 2028 is designed to push that toward 90 percent. At that point, the fab’s freshwater demand is projected to drop from about 4.75 million gallons a day to under 1.2 million. That’s a real reduction, not a press release flourish.

None of it makes the problem disappear. Recycling takes energy, fabs still pull millions of gallons of fresh water daily, and the wastewater they discharge can carry heavy metals and other pollutants. And demand is climbing, with U.S. chip capacity projected to as much as triple by 2032.

The bottom line

The water cost of AI is real, but it’s mostly in the wrong headline. One AI image is a shot glass. One chip fabrication plant is a small city. If you care about where computing actually meets the water supply, the fab is the place to look, and the question that matters isn’t whether chipmakers use enormous amounts of water. They do. It’s whether they recycle it fast enough to keep up with how many chips the world now wants.

Sources

• World Economic Forum, “Semiconductor manufacturing and big tech’s water challenge,” 2024. https://www.weforum.org/stories/2024/07/the-water-challenge-for-semiconductor-manufacturing-and-big-tech-what-needs-to-be-done/

• Manufacturing Dive, “Semiconductor industry faces water, sustainability challenges,” 2025. https://www.manufacturingdive.com/news/semiconductor-chip-ultrapure-water-sustainability/756469/

• Fortune, “Taiwan’s drought is exposing just how much water chipmakers like TSMC use,” 2021. https://fortune.com/2021/06/12/chip-shortage-taiwan-drought-tsmc-water-usage

• Taiwan News, “Taiwan’s TSMC orders water from trucks amid shortage,” 2021. https://www.taiwannews.com.tw/news/4134262

• NPR, “Epic drought in Taiwan pits farmers against high-tech factories for water,” 2023. https://www.npr.org/sections/goatsandsoda/2023/04/19/1170425349/epic-drought-in-taiwan-pits-farmers-against-high-tech-factories-for-water

• The Diplomat, “How Water Scarcity Threatens Taiwan’s Semiconductor Industry,” 2024. https://thediplomat.com/2024/09/how-water-scarcity-threatens-taiwans-semiconductor-industry/

• TSMC 2024 Sustainability Report, via Semiwiki and Little Square Capital, 2025. https://semiwiki.com/semiconductor-manufacturers/tsmc/361249-tsmcs-tsmc-2024-sustainability-report-pioneering-a-greener-semiconductor-future/

• AZBEX, “TSMC Building Water Reclamation Plant,” 2025. https://azbex.com/planning-development/tsmc-building-water-reclamation-plant/

• Ahwatukee.com, “TSMC Arizona’s Water Reclamation Initiative,” 2025. https://www.ahwatukee.com/contributor_content/ascend/tsmc-arizonas-water-reclamation-initiative-forwards-sustainability-in-semiconductor-manufacturing/article_a41cea20-0a23-44e0-af03-418f03e39bf3.html