What method must be used for notifying the public of a Tier 1 contaminant violation?

The correct method for notifying the public of a Tier 1 contaminant violation is through the use of radio and TV stations. This requirement is established to ensure that critical public health information, especially regarding immediate threats to drinking water safety, reaches the broadest audience in a timely manner. Radio and television have the capability to disseminate urgent information quickly and effectively, as these mediums are widely accessible and can reach many individuals at once, including those who may not have internet access or who may not check social media or emails frequently.

Public health is prioritized in cases of Tier 1 violations, which pose a serious risk to human health, thus necessitating a communication method that will ensure the message is received promptly. While phone calls, email alerts, and social media can be effective communication tools under certain circumstances, they do not guarantee the same level of widespread outreach that radio and TV provide, especially during emergencies when immediate awareness is crucial.