In a significant move towards addressing concerns about water quality, the United States Environmental Protection Agency (EPA) has announced a proposal to classify microplastics and pharmaceuticals as contaminants in drinking water. This proposal, revealed on 2 April 2026, marks the first time these substances will be officially acknowledged on the EPA’s Contaminant Candidate List, potentially paving the way for regulatory measures aimed at safeguarding public health.
A Response to Public Concerns
Lee Zeldin, the EPA Administrator, articulated that this proposal responds to growing apprehensions among Americans regarding the safety of their drinking water. “I can’t think of an issue that hits closer to home for American families than the safety of their drinking water,” Zeldin stated during the announcement at EPA headquarters in Washington, D.C. This initiative coincides with the efforts of Robert F. Kennedy Jr.’s Maha movement, which has been advocating for stricter regulations on environmental pollutants.
The Contaminant Candidate List is a critical tool used by the EPA to prioritise research and inform regulatory decisions, although the agency has historically been slow to implement actual limits on pollutants. The draft of this sixth iteration of the list opens a 60-day public comment period, with the expectation that it will be finalised by mid-November.
Current State of Microplastics and Pharmaceuticals in Water
Research has increasingly highlighted the presence of microplastics in various water sources, as well as their potential repercussions on human health. Studies have detected microplastics in human organs, including the heart and brain, raising alarms among scientists and health professionals. Concurrently, pharmaceuticals entering the water supply pose additional health risks, as conventional wastewater treatment systems often fail to eliminate these substances.
Despite the announcement being a pivotal step, sceptics, including Erik Olson from the Natural Resources Defense Council, caution that this is merely the beginning of a protracted process that may not yield substantive outcomes. “It’s the beginning of a very long process that routinely ends in nothing,” Olson remarked.
Activists and Experts Weigh In
The decision to include these contaminants in the candidate list has been met with cautious optimism by environmental advocates. Judith Enck, a former EPA regional administrator and current head of Beyond Plastics, expressed hope that this move could lead to eventual regulations on microplastics in public water supplies. “Including it in the list would be the first step toward eventually regulating microplastics,” Enck stated.
Dr. Philip Landrigan, who leads the Global Observatory on Planetary Health at Boston College, echoed the sentiment but emphasised the necessity of addressing the root causes of plastic production to mitigate pollution effectively. The United States is currently participating in international discussions aimed at formulating a treaty to combat global plastic pollution, although it has resisted proposals for limits on plastic production.
The Role of the Maha Movement
The collaboration between Zeldin and Kennedy’s Maha movement reflects a growing alliance aimed at tackling environmental issues. Activists have expressed frustration over the slow pace of regulatory action, particularly concerning pesticide regulation. Following an executive order from former President Donald Trump that aimed to bolster the agricultural sector through controversial chemicals, Kennedy has reiterated the need for a comprehensive agenda targeting pollutants, including microplastics.
Kennedy has announced an ambitious $144 million initiative called the Systematic Targeting of Microplastics (STOMP), which aims to develop tools for detecting and quantifying microplastics in human bodies. “We can’t treat what we cannot measure. We cannot regulate what we don’t understand,” he asserted.
Future Actions and Regulatory Challenges
The EPA is mandated by the Safe Drinking Water Act to publish its Contaminant Candidate List every five years, subsequently evaluating at least five contaminants for potential regulation. However, previous cycles have often resulted in no significant regulatory action, leading to widespread criticism of the agency’s efficacy.
The latest draft list contains four contaminant groups—microplastics, pharmaceuticals, PFAS (per- and polyfluoroalkyl substances), and disinfection byproducts—alongside numerous chemicals and microbes that could compromise water quality. The ongoing struggle to establish effective regulations is further complicated by political dynamics and varying priorities within the agency.
Why it Matters
The proposed inclusion of microplastics and pharmaceuticals in the EPA’s Contaminant Candidate List represents a crucial step towards ensuring the safety of drinking water for millions of Americans. However, the effectiveness of this initiative will ultimately depend on the agency’s commitment to follow through with meaningful regulations. As public awareness and concern over environmental health issues grow, the pressure on regulators to act decisively will only intensify, highlighting the urgent need for comprehensive strategies to tackle plastic pollution and safeguard public health.
