83 Ill. Adm. Code 501.500
Pressure Regulation
Section 501.500 Pressure Regulation
A utility shall not provide service to any customer at a
pressure, as measured at the outlet of the meter used to measure the customer's
gas consumption, of less than 4 inches of water column or no more than 12 inches
of water column except when the customer requested a higher delivery pressure.
A utility is not in violation of this Section if the pressure variations
occurred because of the operations of a customer in violation of its contract
or the rules of the utility or other events beyond the utility's control.