(1) When circumstances dictate, the purveyor shall give a broader or more immediate notice to protect public health. The department may require the purveyor's notification by whatever means necessary.

(2) When the state board of health grants a public water system a waiver, the purveyor shall notify consumers and new billing units or new customers before water service begins. The purveyor shall provide a notice annually and send a copy to the department.

(3) The department may give notice to the water system users and the owner or operator of any consecutive water system served as required by this section on behalf of the water purveyor. However, the purveyor remains responsible for ensuring Part 7, Subpart A requirements are met.