What category of overflow is associated with 550 gallons of sewage that do not reach surface waters?

The correct answer is linked to the classification of sewage overflows. In the context of sewage spills, they are categorized based on their potential impact on public health and the environment.

When overflows are described as Category 3, they typically pertain to situations where sewage is discharged but does not reach surface waters. This means that although there is a significant amount of sewage involved, specifically 550 gallons in this case, it remains contained and does not pose a direct risk to water bodies, making it less hazardous compared to overflows that reach these waters.

The reasoning behind this categorization reflects an understanding that although the overflow could still pose health risks if it infiltrates soil or groundwater, the absence of direct contact with surface waters mitigates some of the immediate environmental risks associated with larger overflows that categorize into other levels due to their potential to contaminate broader ecosystems.

Understanding these categories aids in emergency response and management, ensuring that appropriate measures are taken based on the severity and potential consequences of the release.