Regulations last checked for updates: May 01, 2025

Title 40 - Protection of Environment last revised: Nov 01, 2025
All TitlesTitle 40Chapter IPart 141Subpart F - Subpart F—Maximum Contaminant Level Goals and Maximum Residual Disinfectant Level Goals
View all text of Subpart F [§ 141.50 - § 141.55]
§ 141.54 - Maximum residual disinfectant level goals for disinfectants.

MRDLGs for disinfectants are as follows:

Disinfectant residual MRDLG(mg/L)
Chlorine4 (as Cl 2).
Chloramines4 (as Cl 2).
Chlorine dioxide0.8 (as ClO2)
[63 FR 69465, Dec. 16, 1998]
authority: 42 U.S.C. 300f,300g,300g,300g,300g,300g,300g,300j,300j,and
source: 40 FR 59570, Dec. 24, 1975, unless otherwise noted.
cite as: 40 CFR 141.54
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