Almond Milk's Water Problem Is Real. It Is Also Smaller Than the Dairy Industry Wants You to Believe.

Almond milk gets attacked online for its water use with a specific talking point. It takes about a gallon of water to grow a single almond. Fair.

That number is true.

It comes from research into almond production in California's Central Valley, where almost all commercial US almonds are grown.

What almost never makes it into the same post is the corresponding number for dairy. One liter of almond milk requires about 371 liters of fresh water. One liter of dairy milk requires about 628.

Dairy is roughly 70 percent thirstier than the plant milk it is being compared to.

That comparison is worth stating clearly, because the internet has decided almond milk is the villain.

Where Both Numbers Come From

The water footprint numbers come from life-cycle assessments that measure the total fresh water used across the full production chain, from irrigating the trees or growing dairy cow feed all the way through processing and packaging.

The Poore and Nemecek 2018 dataset from Oxford, still the most-cited food footprint reference in the field, puts almond milk near the middle of plant-milk options for water use and dairy at the top. Subsequent peer-reviewed life-cycle assessments have refined the numbers but kept the ordering the same.

The dairy figure includes water needed to grow the feed crops (alfalfa, corn silage, soy) that dairy cows eat, water for the cows themselves, and water used in milking, cooling, cleaning, and processing.

Feed is by far the largest share.

The almond figure includes irrigation of the trees, which is heavy, plus the processing water used to soak and blanch almonds and turn them into milk.

Because commercial almond milk is only about 2 percent almonds by weight, the per-liter water footprint of the drink itself is much lower than the per-almond number would suggest at first read.

The Full Ranking, So Nobody Cherry Picks

The full plant milk comparison, using the same methodology, is a useful thing to keep in the head.

Soy milk sits at about 28 liters of water per liter of milk. It is the water efficiency champion of the shelf.

Oat milk comes in at roughly 48 liters per liter. Very close to soy, and slightly better on greenhouse gases in most assessments.

Rice milk uses about 270 liters per liter. Still below almond, above the beans.

Almond milk at about 371 liters per liter.

Dairy milk at about 628 liters per liter.

The gap between soy and dairy is nearly a factor of 25. The gap between almond and dairy is a factor of 1.7. Both are significant. The one you almost never see in a social media post is the first one.

Why the Almond Attack Sticks Anyway

Three reasons the almond narrative punches above its weight.

The California Drought Overlay

California grows about 80 percent of the world's almonds. California also spent much of the 2010s and early 2020s in serious drought.

Coverage of the drought naturally focused on high-value irrigated crops, and almonds are the highest-value irrigated crop in the state.

This attention was correct on its face.

Almonds do use a lot of California's water. But the same coverage rarely mentioned that alfalfa, a cattle feed crop, uses substantially more water in California than almonds do.

Almond Milk Made the Store Shelf First

Almond milk was the first plant milk to reach mass distribution in the US. That made it the target for a lot of early sustainability critique.

Oat milk was still niche when the water debate started. Now that oat has taken market share, the critique has not quite caught up.

Dairy Industry PR

The dairy industry has spent significant money on plant-milk critique, and almond milk was the most visible target. In 2019, the National Milk Producers Federation ran campaigns highlighting almond water use.

What those campaigns did not include was the comparison to dairy itself.

The rebuttal is not that almond milk is fine. It is that dairy uses more of the same resource, and if California drought is the concern, feed-crop irrigation for dairy dwarfs almond acreage.

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What to Do With This Information

A few practical takeaways.

If reducing water footprint is the goal, soy or oat milk is the clean answer.

Both use a fraction of the water of almond, and a tiny fraction of dairy.

Oat milk in particular has become widely available at competitive prices in 2026. For a sense of where the broader plant-based shift is heading, our breakdown of 20 reasons people are going vegan this year covers the full picture.

If almond milk is already the household preference, it is still a better water choice than dairy.

The gap is real but modest.

Switching to oat would improve the number substantially. Switching back to dairy would make it worse.

If the concern is specifically California groundwater, that is a valid but different conversation. Buying almond milk sourced from producers using drip irrigation and groundwater recharge programs is a meaningful choice.

So is reducing dairy consumption, since the largest California water user among food crops is alfalfa grown mostly for cattle.

One Honest Note on Methodology

Water footprint numbers vary depending on which type of water is being counted.

Green water (rainfall used by plants), blue water (surface and groundwater withdrawn for irrigation), and grey water (water needed to dilute pollution from production) all move independently.

The 371 and 628 figures above are total water footprints combining all three.

If the accounting is restricted to blue water only, which is the water most relevant to drought and human use, the almond number stays high because it is heavily irrigation dependent, while the dairy number varies more by farm and region.

Some newer regional assessments put almond milk as low as 130 liters per liter under efficient California operations.

The ordering does not change. Dairy sits above almond, and both sit above soy and oat, on almost every serious accounting.

One Last Thing

Almond milk is not perfect. Nothing in the food system is.

But the specific meme that almond is the environmental villain of the plant-milk aisle does not survive contact with the numbers.

For anyone thinking about switching to a more efficient plant milk, oat and soy are both worth trying.

Our piece on why Korean plant-based cooking is quietly taking over American kitchens is a reasonable next read if you want more on the everyday swaps that actually move the needle.