35 Ill. Adm. Code 301.415
Treatment Works
Section 301
Section 301.415Â Treatment
Works
"Treatment Works"
means individually or collectively those constructions or devices (except
sewers, and except constructions or devices used for the pretreatment of
wastewater prior to its introduction into publicly owned or regulated treatment
works) used for collecting, pumping, treating, or disposing of wastewaters or
for the recovery of byproducts from such wastewater.