WHO: More Research Needed on Microplastics in Drinking Water

By Kelly Young

Edited by André Sofair, MD, MPH

There is no evidence that microplastics — tiny bits of plastic — in the drinking water supply pose a risk to human health at existing levels, but the World Health Organization cautions that data are lacking to draw firm conclusions. Major sources of microplastics in drinking water include surface runoff, industrial waste, and sewer overflows.

Studies suggest that the human body is unlikely to absorb microplastics that exceed 150 micrometers. Microplastics on the nanoscale might be absorbed, but the effects of human ingestion are unknown.

Nine studies reported that microplastic counts ranged from 0 to 10,000 particles per liter of drinking water. Polyethylene terephthalate and polypropylenewere the most commonly detected polymers.

The agency notes that regardless of whether there is a direct human health impact, the public and policymakers should still take steps to reduce plastic from being released into the environment.