Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 611 - PRIMARY DRINKING WATER STANDARDS
Subpart F - MAXIMUM CONTAMINANT LEVELS (MCLs) AND MAXIMUM RESIDUAL DISINFECTANT LEVELS (MRDLs)
Section 611.313 - Maximum Residual Disinfectant Levels (MRDLs)

Current through Register Vol. 48, No. 38, September 20, 2024

a) MRDLs:

Disinfectant residual

MRDL (mg/L)

Chlorine

4.0 (as Cl2)

Chloramines

4.0 (as Cl2)

Chlorine dioxide

0.8 (as ClO2)

b) Compliance

1) CWSs and NTNCWSs. A Subpart B system must comply with this Section.

2) Transient NCWSs. A Subpart B system supplier must comply with the chlorine dioxide MRDL.

c) USEPA identified the best technology, treatment techniques, or other means available for complying with the MRDLs in subsection (a): controlling treatment processes to reduce disinfectant demand and controlling disinfection treatment processes to reduce disinfectant levels.

BOARD NOTE: This Section derives from 40 CFR 141.65.

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