Document Board Proposes Amendments to Groundwater Quality Standards for First Notice

On March 7, 2024, the Board proposed first-notice amendments to update its groundwater quality rules in 35 Ill. Adm. Code 620. The proposed changes will uphold the policy of the Illinois Groundwater Protection Act “to restore, protect, and enhance the groundwaters of the State, as a natural and public resource.” 415 ILCS 55/2(b) (2022). Among the amendments, the Board proposes adding groundwater quality standards for ten new chemicals detected in Illinois groundwater, including six per- and polyfluoroalkyl substances or “PFAS.”

  Document Board Proposes “Identical-in-Substance” Amendments to Ambient Air Quality Standards

On March 7, 2024, the Board proposed amendments to keep Illinois’ ambient air quality standards “identical in substance” to the National Ambient Air Quality Standards (NAAQS). The amendments reflect two actions taken by the United States Environmental Protection Agency (USEPA) during the second half of 2023. First, USEPA updated the current ozone absorption cross-section to the recommended consensus-based cross-section value. Second, USEPA updated its List of Designated Reference and Equivalent Method. This update modified existing method designations and designated a new Federal Equivalent Method (FEM) for measuring concentrations of fine particulate matter (PM10) in ambient air.

  Document Board Proposes “Identical-in-Substance” Amendments to Wastewater Pretreatment Rules

On March 7, 2024, for public comment, the Board proposed amendments to Illinois’ wastewater pretreatment regulations. The proposed amendments are “identical in substance” to rule amendments adopted by the United States Environmental Protection Agency (USEPA) during the second half of 2023. Specifically, on August 9, 2023, USEPA updated the reporting and recordkeeping requirements for dental offices as a point source category (40 C.F.R. § 441.50).

  Document Board Proposes “Identical-in-Substance” Amendments to Hazardous Waste Regulations

On March 7, 2024, for public comment, the Board proposed amendments to keep Illinois’ hazardous waste regulations “identical in substance” to the federal regulations. The proposal reflects action taken by the United States Environmental Protection Agency (USEPA) during the second half of calendar years 2020 and 2021, as well as the first half of calendar year 2023. During these timeframes, USEPA updated its regulations for identifying ignitable hazardous waste, modernized test methods that currently require the use of mercury thermometers, harmonized its regulations on hazardous waste import-export recovery and disposal operations with new Canadian disposal code numbers and descriptions, and revised Method 23.

  Document Board Adopts Non-Substantive Amendments to Agriculture-Related Water Pollution Rules

On February 15, 2024, the Board adopted non-substantive amendments to its agriculture-related water pollution rules. These final amendments are part of a larger undertaking by the Board to update its rules across multiple media and subject areas. The amendments include removing unnecessary language, replacing outdated text, updating statutory references, and reorganizing provisions for clarity. All four Parts of the Board’s Subtitle E rules are affected, i.e., Parts 501, 502, 503, and 506 of Title 35 of the Illinois Administrative Code.

  Document Board Proposes Non-Substantive Amendments to Agriculture-Related Water Pollution Rules for Second Notice

On January 4, 2024, the Board proposed non-substantive amendments to its agriculture-related water pollution rules for second-notice review by the Joint Committee on Administrative Rules (JCAR). These proposed amendments are part of a larger undertaking by the Board to update its rules across multiple media and subject areas. The proposal will remove unnecessary language, replace outdated text, update statutory references, and reorganize provisions for clarity.

  Document Board Adopts “Identical-in-Substance” Amendments to VOM Definition

On January 4, 2024, the Board adopted amendments to keep Illinois’ definition of “volatile organic material” (VOM) “identical in substance” to the federal definition of “volatile organic compound” (VOC). The amendments reflect one action taken by the United States Environmental Protection Agency (USEPA) during the first half of 2023. Specifically, USEPA excluded HFO–1336mzz(E) from its VOC definition (40 C.F.R. § 51.100(s)) after determining that the compound makes a negligible contribution to the formation of tropospheric ozone, commonly known as “smog.” The Board also made a few non-substantive changes to its VOM definition (35 Ill. Adm. Code 211.7150).

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