The emergency rule makes changes to LAC 51:XII.Chapters 3, 9, 11 and 15 regarding the need to increase the minimum disinfectant residual levels and measurements required to be maintained and taken by public water systems. Among other items addressed, the rule clarifies that daily residual measurements are required at the point of maximum residence time in the distribution system and records of chlorine residual measurements taken in the distribution system, besides from the treatment plant(s) itself, shall be recorded and kept by the public water system for a minimum of 10 years. This necessity comes in light of scientific data and recommendation from the federal Centers for Disease Control and Prevention (CDC) relative to the control of the amoeba parasite which has, thus far, been found in four public water systems within Louisiana.