Kirkland Signature vs Eternal Water: which water is healthier?

Updated · Scores from third-party lab reports · How we score

Eternal Water is the healthier choice, scoring 85/100 versus 63/100 for Kirkland Signature. The biggest differences are contaminants and water source.

Kirkland Signature Purified Water Plastic Bottle

Kirkland Signature

Kirkland Signature Purified Water Plastic Bottle

63
Eternal Water Gallon

Eternal Water

Eternal Water Gallon

85

Side-by-side comparison

Kirkland SignatureEternal Water
Purity score63/10085/100
Product comparedKirkland Signature Purified Water Plastic BottleEternal Water Gallon
TypeStillStill
Water sourceMunicipal SupplyMountain Spring
PackagingPlasticPlastic
Microplastics riskHighHigh
Lab testedYesYes
PFAS testedYesYes
Contaminants flagged12
pH5.98.1
TDS (minerals)—110 ppm
Fluoride0 mg/L—

Score breakdown

FactorKirkland SignatureEternal Water
Lab report indexed45/4545/45
Contaminants17/5044/50
Water source15/2525/25
Mineral preservation17/1717/17
Packaging material2/222/22
Cap material7/77/7
PFAS testing5/55/5

Each brand is represented by its most popular product. See all products from Kirkland Signature and Eternal Water.

Frequently asked questions

Which is better, Kirkland Signature or Eternal Water?

Eternal Water is the healthier choice, scoring 85/100 versus 63/100 for Kirkland Signature. The biggest differences are contaminants and water source.

Is Kirkland Signature or Eternal Water better for avoiding microplastics?

Kirkland Signature (plastic) has a high microplastics risk and Eternal Water (plastic) has a high risk, based on packaging material.

Which has more minerals, Kirkland Signature or Eternal Water?

Total dissolved solids (TDS) is not reported for both products, so check each product page for its mineral list.

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