Data / Federal rules / 2026-05452
Announcement of Final Regulatory Determinations for Contaminants on the Fifth Drinking Water Contaminant Candidate List
The Environmental Protection Agency published this final rule in the Federal Register on March 19, 2026.
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What the agency says
The U.S. Environmental Protection Agency (EPA) is announcing final regulatory determinations for nine contaminants listed on the fifth Contaminant Candidate List. Specifically, the Agency is making final determinations not to regulate 2-aminotoluene, cylindrospermopsin, ethoprop, microcystins, molybdenum, permethrin, profenofos, tebuconazole, and tribufos. The Safe Drinking Water Act (SDWA) requires the EPA to make regulatory determinations every five years on at least five unregulated contaminants. A regulatory determination is a decision about whether or not to begin the process to propose and promulgate- a national primary drinking water regulation (NPDWR) for an unregulated contaminant.
Key facts
- Document number
- 2026-05452
- Type
- Final rule
- Action
- Regulatory determinations
- Agency
- Environmental Protection Agency
- Published
- March 19, 2026
- Dates
- For the purpose of judicial review, the determinations not to regulate in this document are issued as of March 19, 2026.
- Docket
- EPA-HQ-OW-2024-0456; FRL-10774-02-OW
- Code of Federal Regulations
- 40 CFR 141
- Pages
- 10
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Read from the Federal Register API, last updated 2026-10-24. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.