35 Ill. Adm. Code 301.350
Pretreatment Works
Section 301
Section 301.350Â Pretreatment
Works
"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.