Section 307.1103  Cyanide

a)         Waste to any public sewer system must not contain more than 10 mg/L total cyanide, and any sample tested must not release more than 2 mg/L of cyanide when tested at a pH of 4.5 and a temperature of 66 ºC (150 ºF) for 30 minutes, except as permitted by subsection (b).

b)         Upon application by a county, municipality, sanitary district, or public utility and approval by the Agency, based upon the Agency's determination that no violation of the effluent standards of 35 Ill. Adm. Code 304 or hazard to workers in that sewage works will result, limited additional amounts of cyanide exceeding the standards in subsection (a) may be discharged to the sewage works of that county, sanitary district, municipality, or public utility.

c)         Nothing in this Section may be construed as limiting the authority of any county, municipality, sanitary district, or public utility to impose any more stringent standards or limitations on cyanide discharges to its sewage works.

d)         Any actions undertaken under subsection (b) will be subject to the limitations of Section 307.2400(b)(7).

(Source:  Amended at 47 Ill. Reg. 4662, effective March 23, 2023)