Residual Chlorine

Section 604.725  Residual Chlorine a)         A minimum free chlorine residual of 0.5 mg/L or a minimum combined chlorine residual of 1.0 mg/L must be maintained in all active parts of the distribution system at all times. b)         Community water supplies must monitor chlorine residual to determine the amount and type of residuals existing at different points in the distribution system. c)         Community water supplies must not mix water sources with free chlorine and combined chlorine residual.