Kirkland Signature vs Aqua Carpatica: which water is healthier?

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

Aqua Carpatica is the healthier choice, scoring 80/100 versus 63/100 for Kirkland Signature. The biggest differences are packaging material and water source.

Kirkland Signature Purified Water Plastic Bottle

Kirkland Signature

Kirkland Signature Purified Water Plastic Bottle

63
Aqua Carpatica Spring Water Glass Bottle

Aqua Carpatica

Aqua Carpatica Spring Water Glass Bottle

80

Side-by-side comparison

Kirkland SignatureAqua Carpatica
Purity score63/10080/100
Product comparedKirkland Signature Purified Water Plastic BottleAqua Carpatica Spring Water Glass Bottle
TypeStillStill
Water sourceMunicipal SupplySpring
PackagingPlasticGlass
Microplastics riskHighLow
Lab testedYesYes
PFAS testedYesYes
Contaminants flagged14
pH5.98.3
TDS (minerals)—205 ppm
Fluoride0 mg/L0 mg/L

Score breakdown

FactorKirkland SignatureAqua Carpatica
Lab report indexed45/4545/45
Contaminants17/5022/50
Water source15/2525/25
Mineral preservation17/1717/17
Packaging material2/2222/22
Cap material7/70/7
PFAS testing5/55/5

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

Frequently asked questions

Which is better, Kirkland Signature or Aqua Carpatica?

Aqua Carpatica is the healthier choice, scoring 80/100 versus 63/100 for Kirkland Signature. The biggest differences are packaging material and water source.

Is Kirkland Signature or Aqua Carpatica better for avoiding microplastics?

Kirkland Signature (plastic) has a high microplastics risk and Aqua Carpatica (glass) has a low risk, based on packaging material.

Which has more minerals, Kirkland Signature or Aqua Carpatica?

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

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