S.C. Code Regs. § 61-58.5.Q
Current through Register Vol. 48, No. 5, May 24, 2024
Section 61-58.5.Q - Maximum Residual Disinfectant Levels (MRDLs) for Disinfectants(1) Maximum residual disinfectant levels (MRDLs) are as follows: Disinfectant Residual | MRDL (mg/L) |
Chlorine | 4.0 | (as Cl2) |
Chloramines | 4.0 | (as Cl2) |
Chlorine dioxide | 0.8 | (as ClO2) |
(2) Compliance dates. (a) Community water systems and non-transient non-community water systems that use a surface water source or a ground water source under the influence of surface water serving 10,000 or more persons must comply with this section beginning January 1, 2002. Community water systems and non-community non-transient water systems that use a surface water source or a ground water source under the influence of surface water serving fewer than 10,000 persons and community water systems and non-community non-transient water systems using only ground water not under the direct influence of surface water must comply with this section beginning January 1, 2004.(b) Transient non-community water systems that use a surface water source or a ground water source under the influence of surface water serving 10,000 or more persons and using chlorine dioxide as a disinfectant or oxidant must comply with the chlorine dioxide MRDL beginning January 1, 2002. Transient non-community water systems that use a surface water source or a ground water source under the influence of surface water systems serving fewer than 10,000 persons and using chlorine dioxide as a disinfectant or oxidant and transient non-community water systems using only ground water not under the direct influence of surface water and using chlorine dioxide as a disinfectant or oxidant must comply with the chlorine dioxide MRDL beginning January 1, 2004.S.C. Code Regs. 61-58.5.Q