Castle Rock

Castle Rock spring water is bottled from a spring near Mt Shasta in Northern California; its 2026 lab report covers the finished still water. — as described by the brand

8.4/10Waterphile Score8/9 properties published

pH6.8 ideal 6.5–8.59.5
TDS57 mg/L ideal 225–500 mg/L5.0
Sodium7 mg/L ideal up to 20 mg/L10.0
Calcium11 mg/L ideal 36.7–80 mg/L · counts half5.0
Magnesium5 mg/L ideal 16.7–30 mg/L · counts half5.0
SulfateND mg/L ideal up to 248 mg/L10.0
Chloride2.8 mg/L ideal up to 250 mg/L10.0
Nitrate0.84113 mg/L as N 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. Editorial score, not a health rating. How scores work →

Mineral FactsPer litre · 9 of 11 values published

Basics

Total dissolved solids TDS

57 mg/L

Minerals

Calcium

11 mg/L

Magnesium

5 mg/L

Sodium

7 mg/L

Potassium

2 mg/L

Other dissolved substances

Bicarbonate

Sulfate

Not detected

Chloride

2.8 mg/L

Nitrate (NO₃)

0.19 mg/L as N

Silica

45 mg/L

— Not published by the brand · we never estimateSource: 2026 National Testing Laboratories analysis report, Castle Rock still water (sampled 10 Aug 2026) · checked 2026-10-25

Source kind: official brand report (independent lab report published by the brand). Alkalinity 60 mg/L is published as CaCO3, so bicarbonate is left empty. Most pages of the PDF are images; values were read from the rendered page.

How it stands out

Sodium is 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.

Suitable for a low-sodium diet (sodium < 20 mg/L)

Taste notes

No taste notes yet. Soon you will be able to say how Castle Rock 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

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Similar waters

Computed from published numbers only: the waters whose mineral values are closest to Castle Rock’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	Shasta Spring, Dunsmuir / Mt Shasta, California
Country	USA · all waters from the USA
Water type	Spring water · what this means
US label wording	Spring water (report wording)
Still or sparkling	Still
Data source	2026 National Testing Laboratories analysis report, Castle Rock still water (sampled 10 Aug 2026) 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 Castle Rock website for stockists. Retailer and price links are coming later.

Compare Castle Rock with

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.