Mineral Water Guide
Mineral Water Regulation in the European Union
Strict rules that protect what you drink.
Natural mineral water sold in the European Union must comply with strict regulations that ensure quality, safety, and transparency. These rules define how mineral water is sourced, tested, and labeled before it reaches consumers.
What Defines Natural Mineral Water
In the EU, natural mineral water must originate from a protected underground source and be microbiologically safe at the source. Unlike ordinary drinking water, it must maintain a stable mineral composition over time.
Protected source
Must come from a geologically protected underground origin
Stable composition
Mineral profile must remain consistent over time
Microbiological safety
Must be safe at the source without chemical treatment
Testing and Monitoring
Before a water can be marketed as natural mineral water, it must undergo detailed analysis. Authorities evaluate:
Mineral composition - identifying all key minerals and their concentrations
Microbiological safety - ensuring the water is free from harmful organisms
Source stability - verifying that the composition remains consistent over time
Geological origin - confirming the protected underground source
These analyses ensure that only waters meeting regulatory standards can carry the "natural mineral water" designation.
Limits on Certain Substances
European regulations define strict limits for certain substances to ensure safety. For example,
Maximum Nitrate Limit
50 mg/L
These limits are designed to ensure that water sold on the market remains safe for regular, long-term consumption.
Transparency Through Labeling
EU law requires mineral water labels to display the full mineral composition, including key parameters like calcium, magnesium, sodium, and fixed residue. This transparency makes it possible to compare waters and understand their mineral profiles.
Want to understand what the numbers on a label mean? Read our guide on How to Read a Water Label.
Official EU labelling terms and thresholds
Directive 2009/54/EC, Annex III, defines the wording a producer may print on a natural mineral water label and the condition each term requires.
| Label term | Condition (Annex III) |
|---|---|
| Very low mineral content | Fixed residue ≤ 50 mg/L |
| Low mineral content | Fixed residue ≤ 500 mg/L |
| Rich in mineral salts | Fixed residue > 1,500 mg/L |
| Contains bicarbonate | Bicarbonate > 600 mg/L |
| Contains sulphate | Sulphate > 200 mg/L |
| Contains chloride | Chloride > 200 mg/L |
| Contains calcium | Calcium > 150 mg/L |
| Contains magnesium | Magnesium > 50 mg/L |
| Contains fluoride | Fluoride > 1 mg/L |
| Contains iron | Bivalent iron > 1 mg/L |
| Acidic | Free carbon dioxide > 250 mg/L |
| Contains sodium | Sodium > 200 mg/L |
| Suitable for a low-sodium diet | Sodium ≤ 20 mg/L |
Fixed residue is measured after evaporation at 180°C. Terms are shown here in English; each EU language has its own official wording.
Annex III also lists indications without an EU-wide numerical threshold, such as suitability for preparing infant food or a possible laxative or diuretic effect. These are not defined by a number in the Directive; they depend on national rules and the assessment of the competent authority.
These are legal labelling criteria, not nutritional or medical recommendations. A water labelled “contains calcium” meets a legal threshold; it is not a statement about how much calcium you need. For individual dietary needs, ask a qualified health professional.
Key Takeaway
EU regulation ensures that natural mineral water is safe, consistent, and transparent. Every label gives you the information you need to understand what you are drinking - and to choose the water that fits you best.