In the September 2022 edition of the White Paper Series, the Intelligence & Analysis Division examines the subject of accidental disruptions affecting critical systems and infrastructure. An accidental disruption is defined as the unintentional failure or loss of technology, systems, and utilities due to aging equipment and infrastructure, harsh environmental conditions coupled with inadequate maintenance, negligence, or other accidental events.  As seen in the paper’s case studies, accidental disruptions can have significant impacts to the environment, as well as public health and safety. This paper provides a baseline understanding of accidental disruptions and their effects.