22. Every disinfection treatment facility for water supplied by a distribution system must have a device that takes continuous measurements of the free residual disinfectant concentration installed at the outlet of each continuous disinfection treatment unit. The device must have an alarm system capable of warning the person in charge or a person designated by the person in charge of a breakdown or defective operation, or of non-compliance with section 8.
If the water supplied is disinfected by means of ultraviolet radiation, the treatment facility must have an alarm system capable of warning of a breakdown or defective operation, or that the lamp intensity has fallen below the required level.
In addition, every disinfection treatment facility that treats water supplied by a distribution system referred to in section 5 must have a device that takes continuous measurements of the turbidity of the water installed downstream of each filtration unit, or in the absence of filtration, at the outlet of the facility. The device must have an alarm system capable of warning of a breakdown or defective operation, or of non-compliance with this Regulation as regards turbidity.
The person in charge of a distribution system supplying water to 20,000 persons or less that has a disinfection treatment facility must, for the purposes of the first paragraph and for each 4-hour period, enter each day in a record the lowest concentration of free residual disinfectant measured in that period, the measurement of water volume and flow rate in the disinfection reserve or reserves corresponding to the lowest free residual disinfectant concentration and, in the case referred to in the third paragraph, the measurement of turbidity. Where chloramines are used, the person in charge must enter each day in the record the lowest concentration of combined residual disinfectant. The water temperature must also be measured by the person in charge and entered in the record each day, as must the water pH if chlorine is used as a disinfectant. The date and the names of the persons taking the measurements must also be entered in the record. The person in charge must sign the record, keep it for a minimum period of 5 years from the date of the last entry and make it available to the Minister.
Every water disinfection treatment facility forming part of a distribution system supplying water to more than 20,000 persons must have a continuous calculation software that enables to determine the elimination rate reached by the facility of the viruses and other microorganisms referred to in sections 5, 5.1 and 6. It must also have an alarm capable of warning at all times the person in charge or the person designated by the person in charge that the facility does not reach the elimination rate of viruses and other microorganisms prescribed by those sections. In addition, the person in charge of such a facility is required to keep and make available to the Minister, for a minimum period of 5 years, the data used for the calculation of the elimination rate of viruses and other microorganisms reached. The data kept must show the elimination rate reached by the facility by at least 1 reading for each 15-minute period.
O.C. 647-2001, s. 22; O.C. 467-2005, s. 20; O.C. 70-2012, s. 28.