Ill. Admin. Code tit. 77, § 930.ILLUSTRATION A
Slow Sand Filter Water Treatment Plant
Effective Oct 1, 200327 Ill. Reg. 15998AUTHORITY: Implementing and authorized by Section 9 of the Illinois Groundwater Protection Act [415 ILCS 55/9].DEPARTMENT OF PUBLIC HEALTH
(Source: Amended at 27 Ill. Reg. 15998, effective October 1, 2003)