Plastic bottled water safety compromised by heat and sunlight

Experts warn that exposing PET plastic water bottles to high temperatures or direct sunlight can cause hazardous chemicals to leach into the water. Birgit Geueke of the Food Packaging Forum cites a 2008 study showing a direct link between chemical migration rates and temperature. Researchers also detected bisphenol A (BPA) and phthalate esters, known endocrine disruptors, in bottled water after heating.

Olwen Martin, associate professor of health and environment at University College London, says the industry repeatedly claims these substances should not be present, yet measurements prove otherwise. The consensus among scientists is that bottled water should be stored in a cool, dark place to minimise chemical release. While the long‑term health impacts of low‑level exposure remain uncertain, the presence of micro‑plastics and leached chemicals raises concerns for consumers worldwide.