§306.302. Expansion of Combined Sewers

Expanding existing or establishing new combined sewer service areas is prohibited, except when the Agency has determined from the permit application the following:

 

a)         The combined sewer service area has adequate treatment or retention capacity to ensure that the effluent limitations of 35 Ill. Adm. Code 304 and the provisions of the Act are not violated;

 

b)         Any anticipated increased flow will not overload connecting segments of the combined sewer system;

 

c)         Increased flow will not aggravate combined sewer overflow problems, including combined sewer surcharges, basement backups, and street flow; and

 

d)         The new combined sewer service area will be tributary to an existing combined sewer system.

 

(Source:  Amended at 47 Ill. Reg. 4641, effective March 23, 2023)