On January 22, 2026, the Board adopted amendments to keep Illinois’ primary drinking water standards (35 Ill. Adm. Code 611) “identical in substance” to the National Primary Drinking Water Regulations (NPDWRs). The amendments reflect actions taken under the NPDWRs by the United States Environmental Protection Agency (USEPA) during 2024. USEPA’s actions included adding new regulations for six per- and poly-fluoroalkyl substances (PFAS), updating the comprehensive Lead and Copper Rule, and approving 93 alternative testing methods (ATMs) for analyzing contaminants in drinking water.
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