83 Ill. Adm. Code 600.120
System Records
Section 600
Section 600.120 System
Records
Each utility shall keep daily
records which shall substantially reflect and provide for continuity of
operations of its plant. The utility shall also keep, insofar as practicable,
a record of such details of system operation as may be necessary to substantially
reproduce its operation. Such records shall show the quantities of water
pumped from each source of supply.