17.1. If the analysis of at least 2 samples of the water made available to users, including 1 sample collected pursuant to section 17, shows that the pH value is less than 6.5 or greater than 8.5, the person in charge of the distribution system must, as soon as possible, notify the Minister and the public health director of the region concerned during business hours and inform them of the measures taken or to be taken to remedy the situation.