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“The Illinois Environmental Protection Agency (IEPA) released new proposed groundwater quality standards for five per- and polyfluoroalkyl substances (PFAS). If formally adopted, the proposed regulations would establish the state’s first enforceable standards for PFAS. The proposed standards were included in a discussion draft of proposed amendments to Illinois’ Part 620 groundwater quality regulations, 35 Ill. Adm. Code Part 620, which provides a broader range of updates and modifications to the groundwater standards.”