Curriculum · Textile Lifecycle
Your T-Shirt's Water Footprint
It takes about 2,700 litres of water to grow the cotton for one t-shirt. That's enough drinking water for one person for almost 3 years. Where does it all go? 💧
The 2,700 litre t-shirt
The 2,700 litre figure comes from the Water Footprint Network, which tracks how much water it takes to make everyday items. For a single 250-gram cotton t-shirt:
- About 2,500 litres go to growing the cotton plant (rain + irrigation). - About 100–200 litres go to processing the cotton — washing, spinning, dyeing.
That's roughly the same as filling a bathtub 50 times. Or providing one person their daily 2 litres of drinking water for 1,350 days.
Why so much? Cotton is a thirsty plant. It's also often grown in dry regions where it relies on irrigation, pulling water from rivers and underground aquifers.
The Aral Sea: when cotton drinks a lake
In the 1960s, the Aral Sea was the 4th largest lake on Earth, sitting between Kazakhstan and Uzbekistan. The Soviet government decided the rivers feeding it should be diverted to grow cotton in the desert.
It worked, in a way. Uzbekistan became the world's 5th-largest cotton producer. But the Aral Sea began to vanish. By 2010, it had lost about 90% of its volume. Hundreds of fishing villages were left stranded miles from any water. The lake bed turned to toxic salt and pesticide dust that locals breathe to this day.
It's the most extreme example of cotton's water footprint, but it's not the only one. Pakistan's Indus River, India's groundwater, and the rivers of West Texas all show similar (smaller) versions of the same story.
How linen and hemp compare
Not all natural fibres are thirsty. Some alternatives use a fraction of the water cotton does:
- Linen (from flax): ~6–10 litres per shirt. Flax grows mostly on rainwater and uses fewer pesticides. - Hemp: similar to linen — very low water needs and grows fast in many climates. - Wool: the calculation is messier (sheep drink water, eat grass) but the per-shirt impact is generally lower than cotton. - Recycled cotton: cuts water use by about 50–80% compared with virgin cotton.
Linen and hemp also tend to last longer than cotton. They wrinkle more (which is why they're less popular), but they're some of the most genuinely sustainable fibres available — and they were what most of the world wore before cotton dominated.
What about polyester's 'low water use'?
You'll sometimes hear that polyester uses less water than cotton. That's technically true at the growing stage — there's no plant. But the comparison is misleading.
Polyester is petroleum. The water required to extract, refine, and process oil into polyester is significant. And polyester's water cost continues every time you wash it (microplastics) and at end of life (it sits in landfill for centuries).
A cleaner version of the comparison: cotton is high-water but biodegradable. Polyester is low-water at the start but creates ongoing water pollution forever. Neither is great. Recycled cotton, linen, hemp, and Tencel/Lyocell (made from sustainably-sourced wood pulp) are the closest things to a low-impact answer.
Key takeaways
- One cotton t-shirt = ~2,700 litres of water (mostly to grow the cotton plant).
- The Aral Sea lost 90% of its volume to cotton irrigation between 1960 and 2010.
- Linen and hemp use ~6–10 litres per shirt — a tiny fraction of cotton's footprint.
- Polyester uses less water at the start but creates ongoing microplastic pollution.
- Recycled cotton cuts water use by 50–80% vs virgin cotton.
Try this
Bathtub math
A standard bathtub holds about 50 litres of water. A standard t-shirt's water footprint is 2,700 litres. How many bathtubs is that? Now count the t-shirts in your wardrobe. How many bathtubs of water does your t-shirt collection represent? Most people end up with several swimming pools.
Linen vs cotton experiment
If you can find a linen shirt and a cotton shirt at home (or in a shop), compare them: how do they feel? How heavy is each? Which one wrinkles more? Which one looks like it would last longer? Linen has a harder feel but often lasts decades. Cotton is softer but wears out faster.
Water audit
For one day, track every time water is used in your home for textiles — washing clothes, drying them, ironing. Estimate the litres. Now add the 2,700 litres each cotton item already used to be born. Notice that the 'in-use' water is a small fraction of the 'birth' water. Where you intervene matters.
Roughly how much water does it take to grow the cotton for ONE t-shirt?
About 2,700 litres — enough drinking water for one person for nearly 3 years, or roughly 50 bathtubs. Most of that water goes to growing the cotton plant itself. Linen, hemp, and recycled cotton use a tiny fraction by comparison.