Illinois Administrative Code
Title 83 - PUBLIC UTILITIES
Part 501 - STANDARDS OF SERVICE FOR GAS UTILITIES AND ALTERNATIVE GAS SUPPLIERS
Subpart D - GAS SERVICE STANDARDS
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.