AUTHORITY: Implementing and authorized by the Illinois Oil and Gas Act [225 ILCS 725], the Illinois Underground Natural Gas Storage Safety Act [415 ILCS 160], and Section 5-45 of the Illinois Administrative Procedure Act [5 ILCS 100].

SOURCE: Adopted November 7, 1951; emergency amendment at 6 Ill. Reg. 903, effective January 15, 1982, for a maximum of 150 days; amended at 6 Ill. Reg. 5542, effective April 19, 1982; codified at 8 Ill. Reg. 2475; amended at 11 Ill. Reg. 2818, effective January 27, 1987; amended at 14 Ill. Reg. 2317, effective January 25, 1990; recodified at 14 Ill. Reg. 3053; amended at 14 Ill. Reg. 13620, effective August 8, 1990; amended at 14 Ill. Reg. 20427, effective January 1, 1991; amended at 15 Ill. Reg. 2706, effective January 31, 1991; recodified at 15 Ill. Reg. 8566; recodified at 15 Ill. Reg. 11641; emergency amendment at 15 Ill. Reg. 14679, effective September 30, 1991, for a maximum of 150 days; amended at 15 Ill. Reg. 15493, effective October 10, 1991; amended at 16 Ill. Reg. 2576, effective February 3, 1992; amended at 16 Ill. Reg. 15513, effective September 29, 1992; expedited correction at 16 Ill. Reg. 18859, effective September 29, 1992; emergency amendment at 17 Ill. Reg. 1195, effective January 12, 1993, for a maximum of 150 days; amended at 17 Ill. Reg. 2217, effective February 8, 1993; amended at 17 Ill. Reg. 14097, effective August 24, 1993; amended at 17 Ill. Reg. 19923, effective November 8, 1993; amended at 18 Ill. Reg. 8061, effective May 13, 1994; emergency amendment at 18 Ill. Reg. 10380, effective June 21, 1994, for a maximum of 150 days; amended at 18 Ill. Reg. 16361, effective November 18, 1994; amended at 19 Ill. Reg. 10981, effective July 14, 1995; amended at 21 Ill. Reg. 7164, effective June 3, 1997; emergency amendment at 22 Ill. Reg. 988, effective December 22, 1997, for a maximum of 150 days; amended at 22 Ill. Reg. 8422, effective April 28, 1998; amended at 22 Ill. Reg. 8845, effective April 28, 1998; amended at 22 Ill. Reg. 22314, effective December 14, 1998; amended at 25 Ill. Reg. 9045, effective July 9, 2001; amended at 35 Ill. Reg. 13281, effective July 26, 2011; amended at 38 Ill. Reg. 18717, effective August 29, 2014; amended at 38 Ill. Reg. 22052, effective November 14, 2014; amended at 40 Ill. Reg. 7051, effective April 22, 2016; expedited correction at 40 Ill. Reg. 11042, effective April 22, 2016; emergency amendment at 40 Ill. Reg. 13265, effective September 1, 2016, for a maximum of 150 days; emergency expired January 28, 2017; amended at 41 Ill. Reg. 2957, effective February 21, 2017; amended at 42 Ill. Reg. 5811, effective March 14, 2018; emergency amendment at 43 Ill. Reg. 4650, effective April 4, 2019, for a maximum of 150 days; emergency expired August 31, 2019; amended at 43 Ill. Reg. 10459, effective September 6, 2019; amended at 43 Ill. Reg. 11524, effective September 24, 2019; amended at 45 Ill. Reg. 13907, effective October 25, 2021; amended at 46 Ill. Reg. 20013, effective January 1, 2023; amended at 48 Ill. Reg. 5734, effective March 27, 2024; amended at 49 Ill. Reg. 565, effective December 30, 2024.