Robotron23 writes: Research published by Orb Media, a nonprofit journalism group, has revealed that microplastics have contaminated high proportions of drinking water and bottled water. Samples from the United States tested positive in 94% of instances, while Europe's contamination averages around 72%. Tests were undertaken at the University of Minnesota School of Public Health, with lead researcher Dr. Anne Marie Mahon noting the risk of plastics carrying bacteria, and commenting: "In terms of fibers, the diameter is 10 microns across and it would be very unusual to find that level of filtration in our drinking water systems." As for the culprit, the report mentions the atmosphere as one obvious source, "with fibers shed by the everyday wear and tear of clothes and carpets." Another potential source is tumble dryers, "with almost 80% of U.S. households having dryers that usually vent to the open air." Overall, the investigation by Orb Media found that 83% of the samples were contaminated with plastic fibers.