Almond Milk Water Usage vs Dairy: Which is Better for the Planet?

Overview

When standing in the dairy aisle of a UK supermarket, the choice between a carton of semi-skimmed and a bottle of unsweetened almond milk is no longer just about taste or lactose intolerance. Increasingly, British consumers are weighing up the environmental cost of their morning tea or porridge. A central part of this debate is the almond milk water usage vs dairy comparison. While almond milk has gained a reputation for being 'thirsty,' it is essential to look at the broader ecological picture, including greenhouse gas emissions and land use, to understand which truly deserves a place in a sustainable fridge.

In the UK, dairy remains a staple, but the rise of plant-based alternatives has been meteoric. However, as climate consciousness grows, shoppers are questioning if they are simply trading one environmental problem for another. Almonds, primarily grown in drought-prone regions like California, require significant irrigation. Meanwhile, dairy farming in the UK involves vast tracts of land and significant methane emissions. This article breaks down the data to see how these two popular liquids stack up against one another in terms of water, carbon, and land.

The Numbers: Almond Milk Water Usage vs Dairy

To understand the scale of the impact, we must look at the data per litre of finished product. According to the landmark study by Poore & Nemecek (2018), which is widely regarded as the most comprehensive analysis of food systems to date, the differences are stark.

• Water Usage: To produce one single litre of dairy milk, it requires approximately 628 litres of water. In contrast, one litre of almond milk requires approximately 371 litres of water. While almond milk uses significantly more water than soy or oat milk (which use roughly 28 and 48 litres respectively), it still uses about 40% less water than traditional cow’s milk.
• Carbon Footprint: Dairy milk is a heavy hitter in terms of emissions, producing roughly 3.15 kg of CO2e per litre. Almond milk is much leaner, producing only about 0.70 kg of CO2e per litre. This includes the emissions from cultivation, processing, and transport.
• Land Use: Dairy requires approximately 8.9 square metres of land per litre, largely for grazing and growing feed crops. Almond milk requires about 0.5 square metres.

In the UK context, these figures are particularly relevant. While the UK has a relatively wet climate compared to California, the global nature of food supply chains means the almond milk you buy in a London Tesco likely originated from a water-stressed basin in the United States, whereas your dairy milk was likely produced on a farm in Somerset or Cheshire.

Why the Difference in Water and Carbon?

The primary reason for the high almond milk water usage vs dairy disparity lies in the biological efficiency of the sources.

The Thirst of the Almond Tree

Almond trees are perennial crops. Unlike annual crops that can be left unplanted during a drought, almond orchards must be watered year-round to keep the trees alive. Approximately 80% of the world's almonds are grown in California's Central Valley. Because this region experiences frequent droughts, the water used is often pumped from underground aquifers or diverted from river systems, which can have devastating effects on local fish populations and land stability (subsidence). However, even with this high demand, the "blue water" (irrigation) footprint of an almond is still lower than the total water footprint of a cow.

The Complexity of Dairy

Dairy’s high water usage isn't just about what the cow drinks. It includes the "green water" (rainwater) used to grow the pasture the cow grazes on, and the "blue water" used to irrigate crops like soy or maize that make up concentrated cattle feed. Furthermore, cows are inefficient converters of energy. A cow must consume massive amounts of calories and water to produce a relatively small volume of milk. Beyond water, the methane produced during enteric fermentation (cow burps) makes dairy’s carbon footprint significantly higher than any plant-based alternative.

What You Can Do

If you are concerned about the almond milk water usage vs dairy trade-off, there are several steps you can take to minimize your personal environmental impact:

1. Consider Other Alternatives: If your primary concern is water scarcity, consider switching from almond milk to oat or soy milk. Oat milk, in particular, performs exceptionally well in the UK climate, often using British-grown oats and requiring a fraction of the water that almonds do.
2. Check the Source: Look for brands that source almonds from regions with better water management or those that use "bee-friendly" farming practices to mitigate the impact on local ecosystems.
3. Reduce Food Waste: In the UK, milk is one of the most wasted food items. Whether you choose dairy or almond, ensure you buy only what you need. Plant-based milks often have a longer shelf life, which can help reduce waste.
4. Support Sustainable Dairy: If you prefer dairy, look for organic or pasture-fed labels. While this doesn't eliminate the methane problem, it often supports better soil health and local biodiversity compared to intensive factory farming.
5. Calculate Your Total Impact: Water and carbon are just two pieces of the puzzle. Using a dedicated tool can help you see how your dietary choices fit into your overall lifestyle footprint.

Bottom Line

When comparing almond milk water usage vs dairy, the evidence is clear: almond milk is the "greener" choice in almost every category, including water. While it is true that almonds are water-intensive compared to other plants, they still require significantly less water—and produce far fewer greenhouse gas emissions—than animal-based milk.

For the environmentally conscious UK consumer, the shift away from dairy is a powerful way to reduce your individual footprint. However, if you want to be the most efficient possible, swapping your almond latte for an oat latte is the ultimate gold standard for British sustainability.

Ready to see how your morning coffee affects the planet? Calculate your personal carbon footprint here.