a) Establishing groundwater cleanup or action levels when there is a release or substantial threat of a release of:
- 1) A hazardous substance or pesticide; or
- 2) Any other contaminant that represents a significant hazard to public health or the environment.
- b) Determining whether a community water supply is taking its raw water from a site or source in compliance with the siting and source water requirements of 35 Ill. Adm. Code 604.200.
- c) Developing Board rulemaking proposals for new or revised numerical standards.
- d) Evaluating mixtures of chemical substances.
This Subpart establishes procedures for issuing a Health Advisory that specifies guidance levels that, in the absence of standards in Section 620.410, must be considered by the Agency in:
(Source: Amended at 49 Ill. Reg. 4488, effective March 28, 2025)