EPA updates contaminant list

The United States Environmental Protection Agency moved in two directions at once this month: on April 2 it put more drinking-water contaminants on its future watchlist, and on April 9 it proposed easing parts of the coal ash rule for power plants. (epa.gov 1) (epa.gov 2) The new drinking-water list is not a ban list. It is a shortlist for the next round of federal review under the Safe Drinking Water Act, which is the law that lets the agency decide what eventually gets a national limit in tap water. (epa.gov) (federalregister.gov) This draft Sixth Contaminant Candidate List includes 75 chemicals, 4 chemical groups, and 9 microbes. The four groups are per- and polyfluoroalkyl substances, microplastics, pharmaceuticals, and disinfection byproducts, which are chemical leftovers that can form when utilities disinfect water. (federalregister.gov) Per- and polyfluoroalkyl substances are the stain-resistant and heat-resistant chemicals used in products like nonstick pans and firefighting foam, and they are often called “forever chemicals” because they break down very slowly. Microplastics are tiny plastic fragments that can come from larger plastic waste or synthetic fibers and are now being treated by the agency as a contaminant group worth separate review. (federalregister.gov) (epa.gov) The practical point is timing: once a contaminant lands on this list, the agency has a formal basis to collect more occurrence data, study health effects, and decide whether a national drinking-water rule should follow. The public comment period on this draft runs through June 5, 2026. (federalregister.gov) (dlapiper.com) A week later, the same agency proposed changes to the coal combustion residuals rule, which is the federal system for handling coal ash from electric power plants. Coal ash can contain metals that leak into groundwater if ponds and landfills are not lined, monitored, and closed correctly. (epa.gov) The April 9 proposal would narrow or remove some coal ash units from the rule, create a new compliance path with more site-specific permitting, and give relief for dewatering structures and older “legacy” units. The agency said it will take comments for 60 days. (epa.gov) That leaves utilities and manufacturers with a split message. The agency is signaling that future drinking-water regulation could expand to newer hazards like microplastics, while current waste-disposal obligations for coal ash could become more flexible. (epa.gov 1) (epa.gov 2) There is a third piece that matters for factories outside big cities. On March 4, the agency launched Real Water Technical Assistance, a program aimed at helping small drinking-water and wastewater systems, especially rural ones, get back into compliance and keep basic infrastructure running. (epa.gov) Real Water Technical Assistance does not hand out construction money. It sends technical help on things like operations, staffing, asset management, loan and grant applications, and meeting federal drinking-water rules, often through groups already working with rural utilities. (epa.gov) (governing.com) For companies that depend on a small town’s water system near a plant, that can change day-to-day risk faster than a future contaminant list does. A rural utility that misses testing deadlines, treatment targets, or maintenance schedules can disrupt production long before Washington finishes writing a new national standard. (governing.com) (epa.gov)