Keeping kombucha under 0.5% ABV
Every kombucha contains a little alcohol — it's a fermented drink. The question that decides how you can sell it isn't whether there's alcohol, but how much, and where the legal line falls in your market.
For most producers the goal is to sell a non-alcoholic beverage, and that's a specific, testable claim. Cross the threshold and your product is legally alcohol — with the excise, licensing and labelling rules that come with it. Staying on the right side of the line is mostly a matter of understanding what pushes alcohol up and measuring the finished result.
Why there's alcohol at all
Kombucha ferments in two overlapping steps: yeast converts sugar into ethanol and CO2, and acetic-acid bacteria oxidise some of that ethanol into the acids that give kombucha its tang. The alcohol you can measure at the end is what's left after that tug-of-war. A well-balanced, fully acidified batch usually lands low — but "usually" isn't a number you can put on a label.
The 0.5% line
In the US, Canada and most markets, a drink sold as non-alcoholic must finish under 0.5% ABV. Parts of the EU allow more — up to 1.2% in some cases — but the safe, widely-accepted line is 0.5%, and the only threshold that matters is the one in the market where you sell. Above it, the product is regulated as alcohol. Knowing your own market's figure is step one, and it should be written into your process, not carried in someone's head.
What pushes ABV up
The same conditions that make more fizz make more alcohol. The usual culprits: a high starting sugar level, a long or warm ferment, an aggressive second fermentation with a generous fruit or juice addition, and warm storage of live, unpasteurised product that keeps fermenting on the shelf. If you're chasing big carbonation, watch alcohol in the same breath — they move together.
Staying under the line
Compliance here is undramatic when it's routine:
- Test the finished product — including after 2F, which is where alcohol quietly climbs.
- Verify the legal figure with a lab. In-house readings are great for trend and control; an accredited test is what stands behind a label claim.
- Keep live product cold so it doesn't drift upward after packaging.
- Record every batch against your market's limit, so the evidence exists before anyone asks.
Alcohol control is one of the two regulatory control points in a kombucha food-safety plan — see HACCP for kombucha for how it sits alongside acidification.
This article is general information, not legal, regulatory or food-safety advice. Follow the rules of the market where you sell and validate your own process with appropriate testing.