How quickly must an operator report an unauthorized discharge?

The requirement for an operator to report an unauthorized discharge immediately, but no later than 24 hours, is grounded in the principle of prompt action to mitigate potential environmental harm. Timely reporting is essential in order to initiate appropriate response measures that can prevent further contamination and protect water quality.

This stringent timeline reflects the urgency associated with unauthorized discharges, as delays could lead to more extensive environmental damage, increased compliance issues, and complications for remediation efforts. By establishing a 24-hour reporting requirement, regulatory frameworks aim to ensure that incidents are addressed swiftly to minimize adverse effects on aquatic ecosystems and public health.

In contrast, the other options suggest longer time frames, which could compromise the effectiveness of the response. Reporting within 72 hours, a week, or merely at the next scheduled inspection would allow potentially harmful substances to linger in the environment, exacerbating impacts on water bodies and the surrounding ecosystem. Therefore, the chosen answer emphasizes the vital importance of responsibility and swift action in environmental management.