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40 C.F.R. § 141.65

Maximum residual disinfectant levels.

§ 141.65 Maximum residual disinfectant levels.

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

Disinfectant residual MRDL (mg/L)
Chlorine4.0 (as Cl2).
Chloramines4.0 (as Cl2).
Chlorine dioxide0.8 (as ClO2).

(b) Compliance dates—(1) CWSs and NTNCWSs. Subpart H systems serving 10,000 or more persons must comply with this section beginning January 1, 2002. Subpart H systems serving fewer than 10,000 persons and systems using only ground water not under the direct influence of surface water must comply with this subpart beginning January 1, 2004.

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