Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 611 - PRIMARY DRINKING WATER STANDARDS
Subpart Z - ENHANCED TREATMENT FOR CRYPTOSPORIDIUM
Section 611.1018 - Requirements for Microbial Toolbox Components: Treatment Performance Toolbox Components
Current through Register Vol. 48, No. 38, September 20, 2024
a) Combined Filter Performance. A supplier that uses conventional filtration treatment or direct filtration treatment receives an additional 0.5 -log Cryptosporidium treatment credit during any month it meets the criteria in this subsection (a). Its combined filter effluent (CFE) turbidity must be less than or equal to 0.15 NTU in at least 95 percent of the measurements. Turbidity must be measured as described in Sections 611.531 and 611.533.
b) Individual Filter Performance. A supplier that uses conventional filtration treatment or direct filtration treatment receives 0.5-log Cryptosporidium treatment credit, which can be in addition to the 0.5-log credit under subsection (a), during any month it meets the criteria in this subsection (b). Compliance with these criteria must be based on individual filter turbidity monitoring as described in Section 611.744 or 611.956(a), as applicable.
c) Demonstration of Performance. The Agency may, by a SEP, approve Cryptosporidium treatment credit for drinking water treatment processes based on a demonstration of performance study that meets the criteria in this subsection (c). This treatment credit may be greater than or less than the prescribed treatment credits in Section 611.1011 or Sections 611.1017 through 611.1020 and may be awarded to treatment processes that do not meet the criteria for the prescribed credits.
BOARD NOTE: Derived from 40 CFR 141.718.