What type of violation requires an all clear notification to the public?

The correct answer is based on the classification of violations related to drinking water standards. A Tier I violation is considered a serious violation that poses a direct or immediate risk to public health, leading to situations where the safe consumption of water is compromised.

In these cases, the public must be notified as soon as possible to mitigate any potential health risks. This notification serves to inform consumers about the nature of the violation and any steps they should take, such as boiling water or using bottled water until the issue has been resolved.

Tier II violations, while also noteworthy, typically pertain to less serious situations where the potential risk to health is not immediate, allowing for a longer timeframe to communicate with the public. Minor violations and technical violations usually do not warrant public notification at all since they do not pose a significant health risk. Thus, the need for an all-clear notification is specifically tied to the nature of Tier I violations.