Kirkland Signature vs Panama Blue: which water is healthier?

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

Panama Blue is the healthier choice, scoring 96/100 versus 63/100 for Kirkland Signature. The biggest differences are contaminants and packaging material.

Kirkland Signature Purified Water Plastic Bottle

Kirkland Signature

Kirkland Signature Purified Water Plastic Bottle

63
Panama Blue Water Glass Bottle

Panama Blue

Panama Blue Water Glass Bottle

96

Side-by-side comparison

Kirkland SignaturePanama Blue
Purity score63/10096/100
Product comparedKirkland Signature Purified Water Plastic BottlePanama Blue Water Glass Bottle
TypeStillStill
Water sourceMunicipal SupplyAquifer
PackagingPlasticGlass
Microplastics riskHighLow
Lab testedYesYes
PFAS testedYesYes
Contaminants flagged11
pH5.97.7
TDS (minerals)—100 ppm
Fluoride0 mg/L—

Score breakdown

FactorKirkland SignaturePanama Blue
Lab report indexed45/4545/45
Contaminants17/5043/50
Water source15/2525/25
Mineral preservation17/1717/17
Packaging material2/2222/22
Cap material7/77/7
PFAS testing5/55/5

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

Frequently asked questions

Which is better, Kirkland Signature or Panama Blue?

Panama Blue is the healthier choice, scoring 96/100 versus 63/100 for Kirkland Signature. The biggest differences are contaminants and packaging material.

Is Kirkland Signature or Panama Blue better for avoiding microplastics?

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

Which has more minerals, Kirkland Signature or Panama Blue?

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

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