The Short Answer
If you want safety above all else, purified water is the winner. It has been stripped of everything—bacteria, parasites, heavy metals, and Pfas In Water. However, it is "dead water" that lacks the electrolyte minerals your body needs for proper hydration.
If you want optimal health, spring water is superior. It naturally contains calcium, magnesium, and potassium. But it's a gamble: you are trusting that the specific spring source hasn't been contaminated by agricultural runoff or forever chemicals.
The verdict? Drink Spring Water in Glass (to avoid microplastics) from a verified clean source, OR drink Purified Water that has been remineralized. Avoid purified water in plastic bottles—it's just expensive, plastic-leaching tap water.
Why This Matters
Water isn't just H2O. Natural water is a complex "soup" of dissolved minerals that our bodies evolved to expect. When you drink water completely void of minerals (purified/distilled), it can actually leach minerals from your body to balance its own chemistry. This is why "pure" isn't always "healthy." Is Reverse Osmosis Worth It
However, the modern world is toxic. A 2024 study using new laser technology found that the average liter of bottled water contains 240,000 nanoplastic fragments—100 times more than previously thought. Because purified water requires aggressive processing, it is often stored in plastic for long periods, turning it into a microplastic cocktail. Microplastics In Bottled Water
Furthermore, PFAS (forever chemicals) are now appearing in natural aquifers. While purified water systems (like Reverse Osmosis) remove PFAS, natural spring water is only as clean as the ground it flows through.
What's Actually In Them
Spring Water
Sourced from underground aquifers and bottled at the source. It is not significantly altered, meaning you get what the earth provides.
- Natural Minerals — Rich in Magnesium (heart health), Calcium (bone health), and Potassium. Is Alkaline Water Better
- Microbiome — "Raw" spring water contains natural bacteria (mostly harmless), though bottled versions are usually UV treated or ozonated.
- Potential Contaminants — If the groundwater is polluted with nitrates or PFAS, it ends up in the bottle.
Purified Water
Usually municipal tap water that has been run through Reverse Osmosis (RO) or Distillation.
- Nothing — The goal is 0 TDS (Total Dissolved Solids). No minerals, no flavor.
- Added Salts — Brands like Dasani add trace amounts of "minerals for taste" (usually magnesium sulfate and potassium chloride) because truly pure water tastes flat and metallic.
- Plastic Leachates — Because purified water is "hungry" (hypotonic), it can be more aggressive at pulling chemicals like antimony and phthalates from the plastic bottle itself.
What to Look For
Green Flags:
- "Spring Water" — Legally must come from an underground formation.
- Glass Bottles — The only way to ensure you aren't drinking thousands of plastic particles. Cleanest Bottled Water
- "Remineralized" — If buying purified, look for electrolytes added after filtration.
- Source Listed — The label names the specific spring (e.g., "Ouachita Mountains, AR").
Red Flags:
- "Purified by Reverse Osmosis" — Just fancy tap water.
- "Municipal Source" — This is tap water.
- Plastic Bottles — Especially if they've been sitting in a hot warehouse.
- Distilled — Generally not for drinking; used for appliances (irons, CPAP machines).
The Best Options
Not all water is created equal. Here is how the major players stack up based on recent testing and sourcing.
| Brand | Type | Container | Verdict | Why |
|---|---|---|---|---|
| Mountain Valley | Spring | Glass | ✅ | Proven source, glass bottle, natural minerals. (Note: Recent lawsuit alleges potential issues, but historically the gold standard). |
| Saratoga | Spring | Glass | ✅ | Cobalt glass protects water; excellent mineral profile. |
| Home RO System | Purified | Glass/Steel | ✅ | You control the filtration and remineralization. Cheapest long-term. |
| Fiji | Artesian | Plastic | ⚠️ | High silica content is good, but 2024 recall (bacteria) and microplastic levels are concerning. Is Fiji Water Clean |
| Smartwater | Distilled | Plastic | ⚠️ | Ideally clean water, but stored in plastic. "Vapor distilled" is just marketing for distilled. |
| Dasani / Aquafina | Purified | Plastic | 🚫 | It is public tap water sold at a 3000% markup. High microplastic risk. |
The Bottom Line
1. Ditch the plastic. The type of water matters less than the bottle it comes in. Glass is non-negotiable if you want to avoid nanoplastics.
2. Spring for hydration. If you are active, the natural electrolytes in spring water are superior to the "dead" profile of purified water.
3. Purified for detox. If your local water is heavily contaminated with PFAS or lead, a home Reverse Osmosis system (purified) is the safest immediate intervention—just add a pinch of sea salt or mineral drops before drinking.
FAQ
Is spring water safer than tap water?
Generally, yes, but not guaranteed. Spring water avoids the chlorine and fluoride found in tap water Is Fluoride In Water Safe, but it is less frequently tested for biological contaminants than municipal water.
Does purified water dehydrate you?
Technically, yes, slightly. Drinking demineralized water can increase urine output and leach minerals from your body to restore equilibrium. It's not dangerous in moderation, but it's not optimal for hydration compared to mineral-rich water.
Which water has more PFAS?
Spring water typically has more PFAS than purified water. Reverse Osmosis (used to make purified water) is one of the few methods that effectively removes PFAS. If you buy spring water, you must trust the source is pristine. Pfas In Water