415 ILCS 5/3.325

"Pesticide release" or "release of a pesticide" means any release resulting in a concentration of pesticides in waters of the State which exceeds levels for which: (1) a Maximum Contaminant Level (MCL) has been promulgated by the U. S. Environmental Protection Agency or a Maximum Allowable Concentration (MAC) has been promulgated by the Board pursuant to the Safe Drinking Water Act (P.L. 93-523), as amended; or (2) a Health Advisory used on an interim basis has been issued by the U. S. Environmental Protection Agency; or (3) a standard has been adopted by the Board pursuant to the Illinois Groundwater Protection Act; or (4) in the absence of such advisories or standards, an action level has been developed by the Agency using guidance or procedures issued by the federal government for developing health based levels.