(a) The Secretary shall judge whether an imminent hazard exists concerning a present or potential condition in a public water system.
(b) In order to eliminate an imminent hazard, the Secretary may, without notice or hearing, issue an order requiring the person or persons involved to immediately take action necessary to protect the public health. A copy of the order shall be delivered by certified mail or personal service. The order shall become effective immediately and shall remain in effect until modified or rescinded by the Secretary or by a court of competent jurisdiction.