You know how mercury bioaccumulates up the food chain? It looks like microplastics are similar [1] [2], and they are everywhere in the food web [3]. It's even in the bottled water [4].
(edit: yes, yes, no surprise it's in the bottled water, maybe we shouldn't be selling bottled water if it's full of microplastics? Less bottled water, more water dispensers everywhere)
The bottled water that comes in plastic bottles? Not that surprising?