U.S. Launches First Nationwide Monitoring of Microplastics and Pharmaceuticals in Drinking Water

The Environmental Protection Agency and the Department of Health and Human Services have announced a landmark initiative to monitor microplastics and pharmaceuticals in U.S. drinking water, marking a critical first step toward understanding their potential health impacts and shaping future regulation.

Under the plan, both contaminants will be added to the sixth Contaminant Candidate List, triggering nationwide testing, research funding, and data collection under the Safe Drinking Water Act. This process could eventually lead to formal regulatory limits if risks to public health are confirmed.

Officials, including EPA Administrator Lee Zeldin and Health Secretary Robert F. Kennedy Jr., framed the move as part of a broader public health push. The EPA will also establish health benchmarks for 374 pharmaceutical compounds commonly found in water systems.

Microplastics-tiny fragments of plastic detected in ecosystems, drinking water, and even human bodies-have raised growing concern among scientists, with some studies linking them to cancer and reproductive harm. Pharmaceuticals, meanwhile, typically enter water supplies through human waste and improper disposal.

The initiative follows mounting pressure from states and advocacy groups, including a petition backed by multiple governors and over 170 environmental and health organizations. While environmental groups welcomed the move as a necessary first step, industry representatives emphasized the need for science-based conclusions, noting that evidence on health impacts remains inconclusive.

As monitoring begins, the effort signals a significant shift toward addressing emerging contaminants-placing water quality, public health, and scientific uncertainty at the center of future U.S. environmental policy.

Nationwide monitoring of emerging contaminants is the beginning of formal disclosure obligations for water utilities, chemical manufacturers and consumer-goods brands upstream. Our sustainability-due-diligence and impact-assessment teams help clients evaluate what monitoring frameworks mean for exposure and align with CDP Water and ISSB S2 disclosure.