3745-81-10. Maximum residual disinfectant levels

(A) Community and nontransient noncommunity public water systems that supply water treated with chlorine and/or chloramines shall comply with the total chlorine MRDL.

(B) Public water systems that treat their water with chlorine dioxide shall comply with the chlorine dioxide MRDL.

(C) Maximum residual disinfectant levels (MRDLs) are as follows:

Disinfectant residual MRDL (mg/l)

Total chlorine 4.0 (as Cl₂).

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Chlorine dioxide 0.8 (as ClO₂).

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(D) The director identifies the following as the best available technology for achieving compliance with the MRDLs identified in paragraph (C) of this rule: control of treatment processes to reduce disinfectant demand and control of disinfection treatment processes to reduce disinfectant levels.

Five Year Review (FYR) Dates: 5/9/2019 and 05/09/2024
Promulgated Under: 119.03
Statutory Authority: 6109.04
Rule Amplifies: 6109.03, 6109.04
Prior Effective Dates: 01/01/2002, 01/01/2010

Prior History: (Five Year Review (FYR) Dates: 01/29/2015 and 01/29/2020
Promulgated Under: 119.03
Statutory Authority: 6109.04
Rule Amplifies: 6109.04
Prior Effective Dates: 01/01/02)