"Pretreatment Works" means a treatment works designed and intended to treat wastewater from an indirect discharge or industrial user as defined in 40 CFR 403 (2022) before it is introduced into a sewer system tributary to a publicly owned or publicly regulated treatment works.
Ill. Admin. Code tit. 35, § 301.350
Amended at 5 Ill. Reg. 6384, effective May 28, 1981