Whenever the director of environmental protection determines that use of water from a public water system presents a threat to the health of persons using such water, he may issue a “water use advisory” alerting the owner, operator, or users of such system of the threat and advising that the use of the water be discontinued or that the water be boiled or otherwise treated to render it safe for use. The director may order the owner or operator of such system to notify its users, or potential users, of the water use advisory by newspaper or other means and to provide notification to radio and television stations.