In the United States, the government is taking a new step to protect drinking water from microplastics. Microplastics are tiny pieces of plastic, usually smaller than 5 millimeters. On April 2, 2026, the U.S. Environmental Protection Agency, or EPA, announced that it would add microplastics to its draft Sixth Contaminant Candidate List, called CCL 6. This is the first time microplastics have appeared on that list. (epa.gov)

Why is this important? The CCL is a list of contaminants that are not yet covered by national drinking-water rules but may need regulation in the future under the Safe Drinking Water Act. So, this new move does not create a legal limit for microplastics today. However, it does push the government to study the problem more closely and to think about possible future rules. EPA says public comments on the draft are open until June 5, 2026, and the final list is expected by November 17, 2026. (epa.gov)

Scientists still have many questions. EPA researchers say microplastics are difficult to study because they come in many sizes, shapes, and materials. The agency also says there are important data gaps, so more research is needed before officials can fully understand the health risks of microplastics in drinking water. In other words, the U.S. is acting now, but it is also admitting that science still has work to do. (epa.gov)

The action is bigger than one list. On the same day, the U.S. Department of Health and Human Services announced STOMP, a $144 million national program to measure microplastics in the human body, study how they move, and develop ways to remove them. Together, these steps show a stronger American response to a modern problem. The water from your kitchen tap may look clear, but now the country is paying more attention to the tiny things we cannot see. (epa.gov)