On December 7, 2023, the Board adopted amendments to Illinois’ primary drinking water regulations at 35 Ill. Adm. Code 611. The amendments are “identical in substance” to amendments adopted by the United States Environmental Protection Agency (USEPA) under the federal Safe Drinking Water Act (SDWA) during the second half of 2022. During this period, USEPA did not amend the federal National Primary Drinking Water Regulations (NPDWRs), but it did grant summary approval of seven additional alternative test procedures (ATPs) for analyzing contaminants in drinking water. The Board therefore added these additional ATPs to the Illinois drinking water monitoring rules.
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