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Luso

Água de Luso is a very light, slightly acidic natural mineral water from the Luso 1 and Luso 2 captations; its producer says silica makes up about 30% of its total mineralisation. — as described by the brand

7.5/10Waterphile Score9/9 properties published

pH5.8 ideal 6.5–8.55.8
TDS43 mg/L ideal 225–500 mg/L5.0
Sodium7.2 mg/L ideal up to 20 mg/L10.0
Calcium0.7 mg/L ideal 36.7–80 mg/L · counts half5.0
Magnesium1.7 mg/L ideal 16.7–30 mg/L · counts half5.0
Sulfate1.5 mg/L ideal up to 248 mg/L10.0
Chloride9.4 mg/L ideal up to 250 mg/L10.0
Nitrate1.6 mg/L ideal up to 10 mg/L10.0
Bicarbonate12 mg/L ideal 30–396.6 mg/L · counts half5.0

Each bar is out of 10 for that property. Deductions: −0.3 for an analysis over 3 years old. Editorial score, not a health rating. How scores work →

Mineral FactsPer litre · 10 of 11 values published

Basics

5.8

Total dissolved solids dry residue 180°C

43 mg/L

Minerals

Calcium

0.7 mg/L

Magnesium

1.7 mg/L

Sodium

7.2 mg/L

Potassium

—

Other dissolved substances

Bicarbonate

12 mg/L

Sulfate

1.5 mg/L

Chloride

9.4 mg/L

Nitrate (NO₃)

1.6 mg/L

Silica

14 mg/L

— Not published by the brand · we never estimateSource: Sociedade Central de Cervejas e Bebidas – Água de Luso technical sheet FT.001-QSAL v20 (rev. 2022-02-28), LNEG report 01/H/2022 (Jan 2022) · checked 2026-10-25

Producer's tech sheet (copy: research/r5-countries/evidence/luso-ft.pdf): pH 5.8 ±0.15, SiO2 14, dry residue 180 °C 43 ±4, total mineralisation 49 ±6, total hardness 8.9, Cl 9.4, HCO3 12, SO4 1.5, NO3 1.6, Na 7.2, Mg 1.7, Ca 0.7 mg/L; LNEG report 01/H/2022, January 2022. 'Mineralização total' 49 is not used as TDS (dry residue 43 is). Analysis over 3 years old (−0.3).

How it stands out

Lowest bicarbonate of the 56 brands that publish a bicarbonate value (12 mg/L).
Sodium is 7.2 mg/L, under the 20 mg/L level the UK/EU uses for “suitable for a low-sodium diet” on natural mineral water labels.

UK/EU label thresholds met

Applied to the published numbers for information; these indications legally apply to natural mineral water labels.

Very low mineral content (fixed residue ≤ 50 mg/L)
Suitable for a low-sodium diet (sodium < 20 mg/L)

Taste notes

No taste notes yet. Soon you will be able to say how Luso tastes to you. Results will appear here once people have voted; nothing is shown until then.

SoftNo votes
CrispNo votes
SmoothNo votes
MineralNo votes
SaltyNo votes
SweetNo votes
BitterNo votes
MetallicNo votes

Ratings & reviews

Waterphile Score lab data

7.5/10

From the brand’s published mineral values. How it works

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Similar waters

Computed from published numbers only: the waters whose mineral values are closest to Luso’s on a log scale, using the values both brands publish as single numbers (at least 5). pH and nitrate are not used. Similar minerals do not mean similar taste.

Source & spring

Source	Luso 1 and Luso 2 captations, Luso, Portugal
Country	Portugal · all waters from Portugal
Water type	Natural mineral water · what this means
Still or sparkling	Still
Data source	Sociedade Central de Cervejas e Bebidas – Água de Luso technical sheet FT.001-QSAL v20 (rev. 2022-02-28), LNEG report 01/H/2022 (Jan 2022) Last checked 2026-10-25

Brands update their analyses from time to time, and values can differ between bottle sizes, plants and batches. Check the label on your bottle. Spotted a change? See corrections.

Where to buy

See the official Luso website for stockists. Retailer and price links are coming later.

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Not medical advice. Waterphile shows mineral values as published by each brand, for general information only. If you have a health condition, follow a restricted diet or prepare infant formula, ask a doctor, pediatrician or health visitor.