On October 2, 2025, the Board proposed 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 proposed amendments reflect six actions taken under the NPDWRs by the United States Environmental Protection Agency (USEPA) during 2024. Specifically, USEPA expedited approval of 93 alternative testing methods (ATMs) for analyzing contaminants in drinking water, added new regulations for six per- and poly-fluoroalkyl substances (PFAS), and updated the comprehensive Lead and Copper Rule
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