Ill. Admin. Code tit. 83, § 280.90
b) Utility Meter Reading:
c) Customer Meter Reading:
d) Meter Readings for Beginning and Ending Service: Unless a utility has taken an actual reading of the meter within the past 60 days, it shall take an actual reading of the meter as prescribed in this subsection (d). The utility may satisfy the requirements of this subsection (d) on the day before or the day after the beginning or ending date if that date falls upon a non-business day of the utility.
f) Bill Labeling: