EPA Passes on Policing 9 Water Villains – Tap Safe Enough?
Published Date: 3/19/2026
Rule
Summary
The EPA decided not to regulate nine specific contaminants found in drinking water, meaning no new rules or costs for water providers right now. This affects public water systems and keeps your tap water safe without extra changes. These decisions are official as of March 19, 2026, and come from a law that checks water safety every five years.
Analyzed Economic Effects
3 provisions identified: 2 benefits, 1 costs, 0 mixed.
No New Rules for Nine Contaminants
The EPA decided not to regulate nine contaminants (2-aminotoluene, cylindrospermopsin, ethoprop, microcystins, molybdenum, permethrin, profenofos, tebuconazole, and tribufos). The agency says these final regulatory determinations will not impose any requirements on anyone and it will not take SDWA regulatory action for these nine contaminants at this time (final as of March 19, 2026).
Low Occurrence Found in Water Systems
EPA's occurrence analysis shows very few public water systems had measurements above health reference levels (HRLs). For example, 2-aminotoluene, permethrin, tebuconazole, and tribufos each had 0.0% of PWSs with at least one measurement > HRL; cylindrospermopsin and ethoprop had 0.01% each; microcystins and molybdenum had 0.06% each; and profenofos had 0.01% (values summarized in the Final Regulatory Determination table).
Possible Future Review if New Data Arises
Although EPA is not regulating these nine contaminants now, the agency says that if new information (for example, new health studies or occurrence data) becomes available, it will evaluate whether to include any of them on a future Contaminant Candidate List. That means these contaminants could be reconsidered for regulation in the future if new evidence appears.
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