Microplastics in Drinking Water: What We Know (and What We Don’t)

Microplastics are plastic particles less than 5 mm in size. They have been found in oceans, air, food — and in tap water studies around the world.

How they enter drinking water

Sources include plastic pollution, degradation of larger plastics, synthetic fibers, and industrial discharge. Treatment plants reduce many contaminants but may not eliminate all particles.

Health science status

Health agencies are still building the evidence base for long-term human risk at low levels. That uncertainty does not mean “ignore everything else” — lead, PFAS, and bacteria are clearer priorities where present.