Section 310.104  State Law

a)         35 Ill. Adm. Code 307 includes three types of prohibitions and pretreatment standards:

1)         Prohibitions, including prohibitions adopted by USEPA at 40 CFR 403.5 and more stringent prohibitions adopted by the Board (e.g., 35 Ill. Adm. Code 307.1101);

2)         National pretreatment standards adopted by USEPA at 40 CFR 405 et seq., and incorporated by reference by the Board (e.g., Subparts F through CT of 35 Ill. Adm. Code 307); and

3)         More stringent concentration-based standards adopted by the Board (e.g., 35 Ill. Adm. Code 307.1102 and 307.1103).

b)         For subcategories for which there are both categorical pretreatment standards and concentration-based standards adopted by the Board for a pollutant, the Control Authority must apply the standard that is more stringent as applied to the particular discharge.

BOARD NOTE:  Derived from 40 CFR 403.4 (2003).

(Source:  Amended at 47 Ill. Reg. 5083, effective March 23, 2023)