Aquafina vs Kirkland Signature: 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 Aquafina. The biggest differences are contaminants and PFAS testing.
Aquafina
Aquafina Plastic Bottle
50
Kirkland Signature
Kirkland Signature Purified Water Plastic Bottle
63Side-by-side comparison
| Aquafina | Kirkland Signature | |
|---|---|---|
| Purity score | 50/100 | 63/100 |
| Product compared | Aquafina Plastic Bottle | Kirkland Signature Purified Water Plastic Bottle |
| Type | Still | Still |
| Water source | Municipal Supply | Municipal Supply |
| Packaging | Plastic | Plastic |
| Microplastics risk | High | High |
| Lab tested | Yes | Yes |
| PFAS tested | No | Yes |
| Contaminants flagged | 3 | 1 |
| pH | 6.4 | 5.9 |
| TDS (minerals) | — | — |
| Fluoride | 0.08 mg/L | 0 mg/L |
Score breakdown
| Factor | Aquafina | Kirkland Signature |
|---|---|---|
| Lab report indexed | 45/45 | 45/45 |
| Contaminants | 0/50 | 17/50 |
| Water source | 15/25 | 15/25 |
| Mineral preservation | 17/17 | 17/17 |
| Packaging material | 2/22 | 2/22 |
| Cap material | 7/7 | 7/7 |
| PFAS testing | 0/5 | 5/5 |
Each brand is represented by its most popular product. See all products from Aquafina and Kirkland Signature.
Frequently asked questions
Which is better, Aquafina or Kirkland Signature?
Kirkland Signature is the healthier choice, scoring 63/100 versus 50/100 for Aquafina. The biggest differences are contaminants and PFAS testing.
Is Aquafina or Kirkland Signature better for avoiding microplastics?
Aquafina (plastic) has a high microplastics risk and Kirkland Signature (plastic) has a high risk, based on packaging material.
Which has more minerals, Aquafina or Kirkland Signature?
Total dissolved solids (TDS) is not reported for both products, so check each product page for its mineral list.