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Kirkland Signature Purified Water Plastic Bottle

Common questions

Is Kirkland Signature Purified Water Plastic Bottle healthy?

Kirkland Signature Purified Water Plastic Bottle scores 42/100 on Scout's independent analysis of ingredients, additives, and lab results — a below-average score in Scout's analysis. Kirkland Signature Purified Water scores 42/100.

Has Kirkland Signature Purified Water Plastic Bottle been lab-tested?

Yes. Kirkland Signature Purified Water Plastic Bottle carries an independent laboratory panel from Independent third-party laboratory testing covering 1 contaminant (including Microplastics) — the full results are on this page.

How processed is Kirkland Signature Purified Water Plastic Bottle?

Kirkland Signature Purified Water Plastic Bottle is NOVA Group 1: Unprocessed or Minimally Processed Foods.

How does Kirkland Signature Purified Water Plastic Bottle compare to other water bottles?

Kirkland Signature Purified Water Plastic Bottle ranks #30 of 38 water bottles in Scout's independent rankings. The current top score in the category is Icelandic Glacial Water at 97/100.

Which ingredients drive Kirkland Signature Purified Water Plastic Bottle's score?

In Scout's ingredient-by-ingredient analysis, Nitrate counts in its favor; Total Trihalomethanes is flagged as an ingredient of concern. The full breakdown, with why each one matters, is in the Key ingredients section on this page.

Healthy alternatives

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Panama Blue Water Glass Bottle
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Kirkland Signature Purified Water Plastic Bottle

Kirkland Signature
Lab tested
42 Poor

Near you

Kirkland Signature is carried at Costco stores. Find one within 25 miles.

At a glance

Beneficial ingredients 1
Harmful ingredients 1
Owned by Costco Wholesale Corporation
Category Water Bottles
Summary

Kirkland Signature Purified Water scores 42/100. Independent testing flagged Total Trihalomethanes (THMs) at roughly 9 times the legal limit — chronic exposure to THMs is linked to reproductive harm and endocrine/hormone disruption. Sourced from municipal supply, treated with micron filtration, RO, and ozone sanitation, but elevated disinfection byproducts persist. Plastic bottle drives a likely-microplastic risk; pH 5.9.

Contaminants 1

Source: Independent third-party laboratory testing

Microplastics
Detected
Moderate

Detected at a moderate level — a meaningful fraction of health-based exposure limits. Worth factoring in if this product is used regularly. Plastic bottle packaging contributes to a likely microplastic exposure risk over time.

Independent third-party testing.

Key ingredients 2

Total Trihalomethanes
Very Bad

Total Trihalomethanes detected at approximately 9× the legal limit. Chronic exposure to THMs is linked to reproductive system damage and hormone disruption, in addition to long-recognized cancer risk.

See more about Total Trihalomethanes →
Nitrate0.1 mg/L
Good

Nitrate (as NO3) detected at 0.1 mg/L, below EWG's strict health guideline of 0.62 mg/L.

See more about Nitrate →

Processing

Group 1 · Minimally processed

Unprocessed or Minimally Processed Foods

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