ISA Municipal Arborist Practice Exam 2026 – Complete Study Resource

Public agencies primarily focus on Category 2 and Category 3 risks due to the potential impacts these categories have on public safety and infrastructure.

Category 2 risks typically pertain to the physical damage trees may cause to structures or vehicles in urban settings. Public agencies prioritize these risks as they can directly affect the safety of citizens and damage publicly owned property, leading to significant liabilities and repair costs.

Category 3 risks involve tree health and maintenance issues, which, while they may not cause immediate physical harm, can lead to longer-term safety concerns if not addressed. Trees that are unhealthy or improperly maintained may become hazardous, leading to potential failures during storms or periods of high winds, again impacting public safety.

By focusing on these two risk categories, public agencies can effectively manage urban tree populations, ensuring that safety concerns are addressed while also maintaining the health and aesthetics of urban greenspaces.