1. (a) The maximum residual disinfection levels (MRDLs) specified in (c), below, shall apply to each community water system and non-transient non-community water system at which any chemical disinfectant is added to the water in any part of the drinking water treatment process.
2. (b) The chlorine dioxide MRDL specified in (c), below, shall apply to each public water system at which chlorine dioxide is used as a disinfectant or oxidant.

3. (c) The MRDLs and maximum residual disinfection level goals (MRDLGs) for disinfectant residuals shall be as specified in Table 705-5 below:

   Table 705-5: MRDLs and MRDLGs

   Contaminant

   MRDL (mg/L)

   MRDLG (mg/L)

   Chlorine, as Cl₂

   4.0

   4

   Chloramines, as Cl₂

   4.0

   4

   Chlorine Dioxide, as ClO₂

   0.8

   0.8

4. (d) Monitoring and compliance for residual disinfectants shall be as specified in Env-Dw 715.

Source. #9699, eff 5-1-10; ss by #12665, eff 1-1-19