Illinois EPA has established specific compliance timelines for the PFAS drinking water Maximum Contaminant Levels (MCLs) under the amended Part 620 groundwater quality regulations. Community water supplies must complete initial monitoring by April 25, 2027, begin ongoing compliance monitoring on April 26, 2027, and achieve compliance with MCLs by April 26, 2029. The standards cover PFOA (4 ppt), PFOS (4 ppt), PFHxS (10 ppt), PFNA (10 ppt), HFPO-DA/GenX (10 ppt), and PFBS (part of Hazard Index mixture).
Illinois EPA Director James Jennings issued an official statement on May 21, 2026 confirming that Illinois will maintain its PFAS drinking water standards regardless of federal regulatory rollbacks. The statement emphasized Illinois' commitment to addressing PFAS pollution and protecting drinking water resources. Illinois has established Maximum Contaminant Levels (MCLs) for six PFAS compounds under its Part 620 groundwater quality regulations, with compliance required by April 26, 2029.
Illinois EPA issued an official statement confirming the state will maintain its PFAS drinking water standards despite the Trump Administration's rollback of federal PFAS regulations. Illinois' Maximum Contaminant Levels (MCLs) for six PFAS compounds (PFOA: 4 ppt, PFOS: 4 ppt, PFHxS: 10 ppt, PFNA: 20 ppt, PFBS: 2,100 ppt, and GenX) remain in effect. The statement confirms Illinois Community Water Supplies must complete initial monitoring by April 25, 2027, begin ongoing compliance monitoring on April 26, 2027, and achieve MCL compliance by April 26, 2029.
Illinois has enacted new legislation requiring wastewater treatment plants and industrial facilities holding Clean Water Act discharge permits to conduct ongoing monitoring for per- and polyfluoroalkyl substances (PFAS) in wastewater discharges, biosolids, and sewage sludge. The law is intended to identify and control major sources of PFAS contamination entering Illinois waterways and the environment.
The Illinois Environmental Protection Agency (Illinois EPA) has amended its Part 620 Groundwater Quality Regulations to establish state-specific Maximum Contaminant Levels (MCLs) for six per- and polyfluoroalkyl substances (PFAS) in drinking water. The amendments are designed to protect public health by limiting PFAS exposure through drinking water sources and strengthening groundwater quality protections across the state. Under the regulation, community water supplies must conduct monitoring for regulated PFAS compounds and demonstrate compliance with the established MCLs according to the phased implementation schedule.