Relax. You’re not chugging a Gatorade bottle every time you take a sip. Studies show that tap water (which your fridge filters) already contains microplastics from pipes and the environment. Your fridge filter stops the big chunks but lets the tiny ones pass through.
The real question is about volume. Are you drinking a mountain of plastic or a molehill? Current research suggests it’s a molehill, but a very annoying molehill that might stick around inside you. The World Health Organization says “drink your water, don’t panic,” but they’re also keeping a nervous eye on the data.