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Buxton
Buxton from Buxton, Derbyshire Peak District — 55 mg calcium, 19 mg magnesium, 24 mg sodium per litre. Hardness, what a litre contributes against the EFSA reference intakes, and the EU label claims the analysis supports.
Where it comes from
Buxton water falls on the Peak District moors, sinks about a kilometre into the limestone, and comes back up warm at around 27 °C after a journey usually put at several thousand years. The limestone shows in the chemistry as a moderate calcium-bicarbonate profile — hard enough to taste of something, far short of the French sulphate waters. The Romans built a bath here, which makes it one of the longest continuously used springs in northern Europe.
Source: Buxton, Derbyshire Peak District · Category: Natural mineral water · Carbonation: Still
This is a reference table, not a diagnosis and not a prescription. If a clinician has put you on a sodium, calcium, potassium or fluid restriction, that number comes from them and overrides anything here. Analyses are revised as sources are re-tested, so the label on the bottle you are holding always outranks this page.
The published analysis
| Constituent | mg per litre | What a litre of it means |
|---|---|---|
| Calcium | 55 | 5.8% of the 950 mg calcium reference |
| Magnesium | 19 | 5.4% of the 350 mg magnesium adequate intake |
| Sodium | 24 | 1.2% of the 2.0 g sodium intake · 0.061 g as salt |
| Potassium | 1 | |
| Bicarbonate | 248 | |
| Sulphate | 23 | |
| Chloride | 37 | |
| Dry residue at 180 °C | 280 | the figure EU law uses for the mineral-content claims |
How hard it is
Hardness is nothing but the calcium and magnesium already in the table above, re-expressed as though all of it were calcium carbonate. For Buxton the arithmetic runs 55 ÷ 40.08 + 19 ÷ 24.31 = 2.15 mmol per litre.
| Unit | Value | Where you meet it |
|---|---|---|
| Millimoles per litre | 2.15 | the chemistry, and the German consumer bands |
| German degrees °dH | 12.1 | dishwasher and washing-machine settings in the Nordics and Baltics |
| French degrees °fH | 21.6 | French and Belgian labelling |
| mg per litre as CaCO₃ | 215.6 | the international classification and most water-utility reports |
That places it at very hard on the classification used in the international drinking-water literature, and mittel (medium) on the three-band German scale printed on detergent packets. Hardness has no health-based guideline value; what it changes is limescale, soap and the taste. More on hardness.
What EU labelling law lets this water claim
Annex III of Directive 2009/54/EC fixes exactly which indications a natural mineral water may print and the figure each one requires. Applying those rules to the analysis above:
| Indication | Criterion | This water |
|---|---|---|
| “Very low mineral content” | not above 50 mg/l dry residue | does not qualify |
| “Low mineral content” | not above 500 mg/l dry residue | qualifies |
| “Rich in mineral salts” | above 1 500 mg/l dry residue | does not qualify |
| “Contains bicarbonate” | above 600 mg/l bicarbonate | does not qualify |
| “Contains sulphate” | above 200 mg/l sulphate | does not qualify |
| “Contains chloride” | above 200 mg/l chloride | does not qualify |
| “Contains calcium” | above 150 mg/l calcium | does not qualify |
| “Contains magnesium” | above 50 mg/l magnesium | does not qualify |
| “Contains fluoride” | above 1 mg/l fluoride | no published figure |
| “Contains sodium” | above 200 mg/l sodium | does not qualify |
| “Suitable for a low-sodium diet” | below 20 mg/l sodium | does not qualify |
A litre against a day
| Nutrient | Per litre | Share of an adult day |
|---|---|---|
| Calcium | 55 mg | 5.8% of the 950 mg EFSA reference intake |
| Magnesium | 19 mg | 5.4% of the 350 mg adequate intake for men |
| Sodium | 24 mg | 1.2% of the 2.0 g safe and adequate intake |
The sodium contribution is small enough to disappear into the noise of an ordinary diet, where bread and cheese do the real work. Which is the general rule for bottled water and sodium — the exceptions are the sodium-bicarbonate waters, and they announce themselves on the label.
Analyses: the figures each producer publishes on the label or in its technical sheet — see the basis line on every water page. Reference intakes: EFSA Dietary Reference Values. Label claims: Directive 2009/54/EC, Annex III. Mineral-water constituent limits and the fluoride labelling rule: Directive 2003/40/EC. Tap-water parametric values: Directive (EU) 2020/2184. Checked 2026-09-06.
Frequently asked questions
What is in Buxton?
Buxton is still from Buxton, Derbyshire Peak District, natural mineral water. The published analysis is 55 mg calcium, 19 mg magnesium, 24 mg sodium per litre.
Is Buxton hard water?
Calcium and magnesium together come to 2.15 mmol per litre, which is 12.1 °dH or about 215.6 mg per litre as calcium carbonate — very hard on the international scale and mittel (medium) on the German one.
Is Buxton suitable for a low-sodium diet?
Not on the EU criterion, which reserves that claim for waters under 20 mg of sodium per litre. This one carries 24 mg per litre, so a litre is roughly 1.2% of the 2.0 g safe and adequate sodium intake before any food is counted.
How much magnesium does Buxton have?
19 mg per litre, which is about 5.4% of the EFSA adequate intake of 350 mg a day for adult men and 6.3% of the 300 mg figure for women. EU labelling allows a "contains magnesium" claim above 50 mg per litre.
Waters with a similar mineral load
Fiji Water
Fiji · Still
evian
France · Still
Acqua Panna
Italy · Still
Highland Spring
Scotland · Still
All waters compared
The full table, grouped by mineral content.
Water hardness explained
Degrees, millimoles and parts per million, converted.
Know what you drank, not just what you bought
TempoLife logs hydration alongside food and sleep, so the litre you actually drank is in the same picture as everything else.