Section 303.449  Chicago Sanitary and Ship Canal

The numeric water quality standards for chloride and Total Dissolved Solids in 35 Ill. Adm. Code 302.407(g) do not apply to the Chicago Sanitary and Ship Canal from December 1 through April 30 for the protection of aquatic organisms.  Chloride levels in these waters must meet the numeric water quality standards of 620 mg/L as a chronic water quality standard and 990 mg/L as an acute water quality standard from December 1 through April 30.

(Source:  Amended at 47 Ill. Reg. 4575, effective March 23, 2023)