Kirkland Signature Purified Water Plastic Bottle

Kirkland Signature
Lab tested
42 Poor

Swap it for

Icelandic Glacial Water Icelandic Glacial · 500 ml · pack of 24 97 View on Amazon · $30.72 See all Bottled Water, ranked

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
Category Bottled Water
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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Amazon pricing & content

Amazon price for Icelandic Glacial Water as of . Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.

CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED “AS IS” AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.

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. 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.

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 bottled waters?

Kirkland Signature Purified Water Plastic Bottle ranks #30 of 38 bottled waters 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.

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