Is bottled water safer than tap water during pregnancy?
No. Bottled water has more microplastics than most tap water. Filtered tap is cleaner.
What's actually in it
Most bottled water sold in the U.S. is purified tap water in a PET plastic bottle. The bottle sheds microplastics over time, especially when warm. The cap and neck grind plastic against plastic with every twist.
Tap water goes through federal monitoring with some strict contaminant rules. Bottled water is regulated as a food product, with fewer required tests.
What the research says
A 2025 study in Environ Monit Assess found microplastics in nearly every tested bottle of drinking water. A 2025 study showed tap water had far fewer microplastics after treatment. A 2025 study in Sci Adv tied swallowed microplastics to brain vessel effects in mice.
During pregnancy, filter your tap water with activated carbon or reverse osmosis, then drink from glass or stainless steel. That beats bottled on almost every measure.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Microplastics in drinking water bottles and milk packaging. | Environ Monit Assess | 2025 |
| Microplastic removal across ten drinking water treatment facilities. | NPJ Clean Water | 2025 |
| Microplastics in bloodstream induce cerebral thrombosis. | Sci Adv | 2025 |
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