What type of incident command system has one person in charge despite multiple responding agencies?

In a single command system, there is one person designated as the incident commander who has the authority and responsibility for managing the scene during an incident. This structure is particularly effective when the situation involves multiple agencies, as it provides a clear line of communication and decision-making, ensuring that actions taken are cohesive and directed towards a common goal.

The single command system simplifies the incident management process, minimizing confusion and enhancing operational efficiency. By having a single leader, it streamlines the chain of command, thus facilitating quicker decisions and response actions, which is critical in time-sensitive situations often encountered in hazardous waste operations. This clarity of leadership is essential for maintaining safety and coordination among different responders.

In contrast, the other options typically involve shared leadership or multiple points of command, which can complicate response efforts. A unified command system, for instance, allows for shared decision-making among multiple leaders from different agencies, while a decentralized command system disperses authority among various leaders, potentially resulting in conflicting directives. Thus, the single command system stands out as the best choice when clear, centralized management is necessary in a multi-agency response scenario.