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Celtic Spring

Celtic Spring is Montgomery Waters' longest-running natural mineral water, abstracted at Churchstoke in Powys since 1998 and sold by retailers nationwide. — as described by the brand

9.3/10Waterphile Score8/9 properties published

pH7.96 ideal 6.5–8.59.8
TDS234 mg/L ideal 225–500 mg/L9.2
Sodium11.7 mg/L ideal up to 20 mg/L10.0
Calcium49.3 mg/L ideal 36.7–80 mg/L · counts half10.0
Magnesium6.5 mg/L ideal 16.7–30 mg/L · counts half5.0
Sulfate20.7 mg/L ideal up to 248 mg/L10.0
Chloride21 mg/L ideal up to 250 mg/L10.0
Nitrate7.1 mg/L ideal up to 10 mg/L10.0
BicarbonateNot published −0.1—

Each bar is out of 10 for that property. Deductions: −0.1 for missing values, −0.1 for an undated analysis. Editorial score, not a health rating. How scores work →

Mineral FactsPer litre · 9 of 11 values published

Basics

7.96

Total dissolved solids dry residue 180°C

234 mg/L

Minerals

Calcium

49.3 mg/L

Magnesium

6.5 mg/L

Sodium

11.7 mg/L

Potassium

0.77 mg/L

Other dissolved substances

Bicarbonate

—

Sulfate

20.7 mg/L

Chloride

21 mg/L

Nitrate (NO₃)

7.1 mg/L

Silica

—

— Not published by the brand · we never estimateSource: montgomeryspring.co.uk – Celtic Spring, typical analysis at source mg/L · checked 2026-10-26

Official typical analysis at source: Ca 49.3, Mg 6.5, K 0.77, Na 11.7, Cl 21, SO4 20.7, NO3 7.1, dry residue 180°C 234 mg/L, pH 7.96.

How it stands out

Sodium is 11.7 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.

Low mineral content (fixed residue ≤ 500 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 Celtic Spring 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

9.3/10

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 Celtic Spring’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	Churchstoke, Montgomery (Powys), Wales
Country	UK (Wales) · all waters from the UK
Water type	Natural mineral water · what this means
Still or sparkling	Still
Data source	montgomeryspring.co.uk – Celtic Spring, typical analysis at source mg/L Last checked 2026-10-26

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 Celtic Spring 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.