Kirkland Signature vs Pure Life: which water is healthier?

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

Kirkland Signature is the healthier choice, scoring 63/100 versus 50/100 for Pure Life. The biggest differences are contaminants and PFAS testing.

Kirkland Signature Purified Water Plastic Bottle

Kirkland Signature

Kirkland Signature Purified Water Plastic Bottle

63
Pure Life Purified Water with Minerals Plastic Bottle

Pure Life

Pure Life Purified Water with Minerals Plastic Bottle

50

Side-by-side comparison

Kirkland SignaturePure Life
Purity score63/10050/100
Product comparedKirkland Signature Purified Water Plastic BottlePure Life Purified Water with Minerals Plastic Bottle
TypeStillStill
Water sourceMunicipal SupplyMunicipal Supply
PackagingPlasticPlastic
Microplastics riskHighHigh
Lab testedYesYes
PFAS testedYesNo
Contaminants flagged16
pH5.97.2
TDS (minerals)—40 ppm
Fluoride0 mg/L0 mg/L

Score breakdown

FactorKirkland SignaturePure Life
Lab report indexed45/4545/45
Contaminants17/500/50
Water source15/2515/25
Mineral preservation17/1717/17
Packaging material2/222/22
Cap material7/77/7
PFAS testing5/50/5

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

Frequently asked questions

Which is better, Kirkland Signature or Pure Life?

Kirkland Signature is the healthier choice, scoring 63/100 versus 50/100 for Pure Life. The biggest differences are contaminants and PFAS testing.

Is Kirkland Signature or Pure Life better for avoiding microplastics?

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

Which has more minerals, Kirkland Signature or Pure Life?

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

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