Beer myths examined
Did people drink beer because the water was unsafe?
“In the Middle Ages the water was too dangerous to drink, so everyone — including children — drank weak beer instead.”
Medieval people drank water routinely and said so in writing. They also drank a great deal of ale, for reasons that were mostly about calories, taste and sociability rather than safety — though where water was visibly foul, choosing ale was sensible and people did.
People wrote about drinking water, casually
The strongest argument against the myth is how unremarkable water is in the sources. Medieval writers mention drinking it in passing, the way one mentions something ordinary. Lupus Servatus, a ninth-century abbot, recommends water from a clear well or a running brook. The Byzantine physician Paul of Aegina calls water useful in every mode of regimen. The Regimen Sanitatis Salerni, the most widely circulated medical text of the period, recommends drinking from cool springs.
Cities behaved as though water mattered, too, and infrastructure is expensive evidence. London built a public conduit in the thirteenth century. Alberti, writing in the fifteenth, treats a good water supply as something a city must have. Bede records King Edwin providing public access to water. None of this is the behaviour of a society that thought water was poison.
The most quoted single line is from Ælfric’s Colloquy, where a pupil asked what he drinks answers: ale if he has any, or water if he has no ale. That is a preference, plainly stated, and it is the opposite of a prohibition.
What people actually avoided
Medieval people were not indiscriminate about water and had no reason to be. They avoided stagnant and marshy sources, and they avoided water that was visibly or obviously foul — which in a dense medieval city, downstream of tanneries and cesspits, was a real and growing problem through the later Middle Ages. Where the local water was bad, drinking ale instead was a sound decision and people made it.
That is the grain of truth the myth grew from, and it is worth stating precisely: not "water was unsafe" but "some water was unsafe, people could usually tell which, and they acted accordingly."
Why they really drank so much ale
Ale was food. A weak ale made from grain carries meaningful calories, some protein and B vitamins, in a diet where calories were the constraint. It was a way of consuming grain that also kept for a few days, tasted better than water, and could be made at home from what a household already had.
It was also social and economic in ways water is not. Ale was brewed, sold, taxed, given as part of wages, and drunk in company. A great deal of ordinary medieval commerce and sociability ran through it. Explaining that in terms of water safety mistakes the interesting thing for a hygiene footnote.
The one place the myth nearly works
The claim is most defensible for the industrial nineteenth-century city rather than the medieval village — and it is almost never made about that period. Urban water supplies in the 1800s were genuinely lethal in a way medieval well water usually was not, cholera was waterborne, and the connection between water and disease was being established in exactly those decades. If anyone had an evidence-based reason to prefer beer to water, it was a Londoner in 1850, not a peasant in 1350.
What to keep
Weak ale genuinely was a safer bet than bad water, because it had been boiled and had some alcohol in it, and where water was visibly foul people chose ale for exactly that reason. Ale was also a serious part of the diet rather than a treat. Both of those are true and interesting; it is the blanket claim — that water was avoided as a rule — that does not hold.
Every myth page here has to answer this. A correction that leaves a reader with less than they arrived with is not an improvement, and the salvageable part is usually the better story.
Where the story comes from
The story appears to be a modern back-formation rather than a medieval belief. It has the shape of an explanation invented to answer a question — why did they drink so much ale? — by someone who assumed the answer must be practical. It spread through popular history writing and then through the beer trade, where it flatters the product.
Why it persists
Because it is a good story, it makes drinking sound prudent, and it is unfalsifiable in casual conversation — nobody at a bar has a thirteenth-century medical text to hand. It also fits a general picture of the Middle Ages as filthy and ignorant, which is itself a modern habit rather than a finding.
Questions
Did medieval people drink water?
Routinely, and they wrote about it without comment. Medical texts of the period recommend it, cities built conduits to supply it, and one of the most quoted lines on the subject — from Ælfric’s Colloquy — has a pupil saying he drinks ale if he has any and water if he does not. What people avoided was stagnant or visibly foul water, which is a different and much narrower claim.
So why did they drink so much ale?
Mostly because it was food. Weak ale made from grain carries real calories, some protein and B vitamins, keeps for a few days, tastes better than water and can be made at home. It was also the medium of a great deal of ordinary sociability and commerce. Safety was a factor only where the water was obviously bad.
Connected
What this is about: Small beer
In context: Ancient beer · Medieval brewing
Last reviewed 2026-08-29.
Evidence
What BeerHQ knows about this, and how. Every statement carries the state of the evidence behind it rather than being presented flatly as fact.
Medieval sources refer to drinking water routinely and without alarm, medical texts of the period recommend it from good sources, and cities invested in water infrastructure — which is not the behaviour of a society that regarded water as unsafe in general.
Backed by a source
Source: Medievalists.net, "Did Medieval People Drink Water?" (2023), survey of the primary references
The claim that medieval people avoided water in favour of ale has no scholarly work establishing it, and BeerHQ has found the counter-argument conducted largely in popular history rather than in peer-reviewed literature.
Widely repeated, not traced Probably right, but BeerHQ has not found a source it trusts for it.