Does Smartwater Have Microplastics? Vapor-Distilled, Still Bottled in PET (2026)

Last updated: July 16, 2026

Does Smartwater contain microplastics?

No lab has published a Smartwater-specific count, so the honest answer starts there: Smartwater was not among the eleven brands in the 2018 study led by Sherri Mason at SUNY Fredonia, still the only peer-reviewed work to name the brands it tested. Across those brands, 93% of 259 bottles showed microplastic contamination, averaging about 325 particles per litre once fragments down to 6.5 microns were counted. No brand tested clean.

The reason that category finding almost certainly extends to Smartwater is mechanical, not statistical. The contamination Mason found pointed at packaging: the single most common polymer was polypropylene, the material of the cap, followed by materials consistent with the bottle itself. Smartwater ships in the same PET bottle with the same polypropylene-family closure as the brands that were tested. The 2024 PNAS study pushed the numbers far higher by counting nanoplastics: roughly 240,000 particles per litre across three common (unnamed) brands, with PET among the most common plastics detected in the water. Same bottle, same shedding mechanics.

What vapor distillation does, and what it can't do

Smartwater's marketing hook is “vapor distilled”: the source water (municipal supply) is evaporated and re-condensed, leaving dissolved solids, heavy metals, and most contaminants behind. Then electrolytes are added back for taste. As purification goes, this is thorough, and it sidesteps one problem its purified rivals have: the 2024 PNAS team traced much of the nanoplastic they found to reverse-osmosis membranes, the polyamide filters brands like Aquafina and Dasani run their water through. Distillation doesn't use one.

But distillation happens at the plant, before the water meets the bottle. Every hour after bottling, the PET walls and the cap threads are the water's environment. Heat accelerates the shedding, which matters for a brand sold in gas-station coolers and left in hot cars all summer. Cap abrasion adds more with every twist. Purity of the source water is a claim about what was removed at the plant; it says nothing about what the package adds afterward.

The recycled-bottle wrinkle

Most US Smartwater bottles are now made from 100% recycled PET, caps and labels excluded. That is a genuine packaging-waste improvement and worth crediting. It is not a microplastic improvement: recycled PET is chemically the same polymer as virgin PET and sheds by the same mechanisms. Buying the recycled bottle helps the ocean; it doesn't change what ends up in the water you drink.

Smartwater vs the alternatives

See how the whole shelf compares in our bottled water brands ranked guide and the bottled water microplastic database. For the premium-water angle from a spring source instead of a distilled one, our Fiji audit covers the other end of the marketing spectrum.

What to drink instead

• Recreate the purity at home. A certified filter takes tap water to distilled-grade cleanliness for pennies a litre, with no bottle to shed into it.
• Keep the electrolytes if you like them. Smartwater's taste comes from added minerals, not the distillation. A pinch of electrolyte mix in filtered water is the same recipe without the PET.
• Switch the container. A glass or stainless bottle removes the single most controllable exposure variable.