410 ILCS 655/45: Potential contamination.

(a) Upon a determination by the Department that a particular water source is subject to potential contamination, the Department shall notify the appropriate bottler, distributor, or vendor of bottled water, owner or operator of a water-vending machine, water hauler, retail water facility operator, or private water source operator of the specific contaminants or class of contaminants that pose a potential health risk.

(b) Within 7 days after notification by the Department, the bottler, distributor, or vendor of bottled water, owner or operator of a water-vending machine, water hauler, retail water facility operator, or private water source operator must conduct an analysis of the water source and submit the results of the analysis to the Department.

(c) If evidence of contamination is found, the Department may, by order, require the bottler of bottled water, owner or operator of a water-vending machine, or private water source operator to conduct an analysis of the finished water product for the contaminants of concern in accordance with conditions specified by the Department. The water analysis must be conducted and reported on an annual basis, unless the Department finds that reasonable action requires either more frequent or less frequent analysis.