Ill. Admin. Code tit. 35, § 611.740 - General Requirements

a) The requirements of this Subpart R are National Primary Drinking Water Regulations. These regulations establish requirements for filtration and disinfection that are in addition to standards under which filtration and disinfection are required under Subpart B. The requirements of this Subpart R are applicable to a Subpart B system supplier serving 10,000 or more persons, unless otherwise specified in this Subpart R. The regulations in this Subpart R establish or extend treatment technique requirements in lieu of maximum contaminant levels (MCLs) for the following contaminants: Giardia lamblia, viruses, heterotrophic plate count bacteria, Legionella, Cryptosporidium, and turbidity. Each Subpart B system supplier serving 10,000 or more persons must provide treatment of its source water that complies with these treatment technique requirements and are in addition to those identified in Section 611.220. The treatment technique requirements consist of installing and properly operating water treatment processes that reliably achieve the following:
1) At least 99 percent (2-log) removal of Cryptosporidium between a point where the raw water is not subject to recontamination by surface water runoff and a point downstream before or at the first customer for filtered systems, or Cryptosporidium control under the watershed control plan for unfiltered systems; and
2) Compliance with the profiling and benchmark requirements under the provisions of Section 611.742.
b) A PWS supplier subject to the requirements of this Subpart R is considered to be in compliance with the requirements of subsection (a) if the following is true:
1) It meets the requirements for avoiding filtration in Sections 611.232 and 611.741, and the disinfection requirements in Sections 611.240 and 611.742; or
2) It meets the applicable filtration requirements in either Section 611.250 or Section 611.743, and the disinfection requirements in Sections 611.240 and 611.742.
c) A supplier must not begin construction of uncovered finished water storage facilities.
d) A supplier that decides to make a significant change to its disinfection practice, as described in Section 611.742(c)(1)(A) through (c)(1)(D) must obtain the approval of the Agency prior to making such a change.


Ill. Admin. Code tit. 35, § 611.740

Amended at 27 Ill. Reg. 16447, effective October 10, 2003

Amended at 42 Ill. Reg. 1140, effective 1/4/2018

BOARD NOTE: Derived from 40 CFR 141.170 (2016).

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