Deer Park 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 59/100 for Deer Park. The biggest differences are contaminants.
Deer Park
Deer Park Spring Water Plastic Bottle
59
Kirkland Signature
Kirkland Signature Purified Water Plastic Bottle
63Side-by-side comparison
| Deer Park | Kirkland Signature | |
|---|---|---|
| Purity score | 59/100 | 63/100 |
| Product compared | Deer Park Spring Water Plastic Bottle | Kirkland Signature Purified Water Plastic Bottle |
| Type | Still | Still |
| Water source | Spring | Municipal Supply |
| Packaging | Plastic | Plastic |
| Microplastics risk | High | High |
| Lab tested | Yes | Yes |
| PFAS tested | Yes | Yes |
| Contaminants flagged | 13 | 1 |
| pH | 6.55 | 5.9 |
| TDS (minerals) | 120 ppm | — |
| Fluoride | 0 mg/L | 0 mg/L |
Score breakdown
| Factor | Deer Park | Kirkland Signature |
|---|---|---|
| Lab report indexed | 45/45 | 45/45 |
| Contaminants | 0/50 | 17/50 |
| Water source | 25/25 | 15/25 |
| Mineral preservation | 17/17 | 17/17 |
| Packaging material | 2/22 | 2/22 |
| Cap material | 7/7 | 7/7 |
| PFAS testing | 5/5 | 5/5 |
Each brand is represented by its most popular product. See all products from Deer Park and Kirkland Signature.
Frequently asked questions
Which is better, Deer Park or Kirkland Signature?
Kirkland Signature is the healthier choice, scoring 63/100 versus 59/100 for Deer Park. The biggest differences are contaminants.
Is Deer Park or Kirkland Signature better for avoiding microplastics?
Deer Park (plastic) has a high microplastics risk and Kirkland Signature (plastic) has a high risk, based on packaging material.
Which has more minerals, Deer Park or Kirkland Signature?
Total dissolved solids (TDS) is not reported for both products, so check each product page for its mineral list.