Which reason for procuring a plumbing permit is incorrect?

The need for a plumbing permit is typically determined by the complexity and impact of the plumbing work being performed. Installing new fixtures, replacing water pipes, and constructing a new building all involve significant alterations to the plumbing system or structures connected to it, requiring oversight to ensure safety and compliance with local building codes.

Cleaning out sewer pipes, on the other hand, is generally considered routine maintenance rather than a structural change or installation. This type of work usually does not alter the existing plumbing system's design or involve new installations, which is why it typically does not necessitate a permit. The focus of obtaining a permit is to track installations and modifications that could affect public health and safety, and routine maintenance tasks like cleaning do not fall within that scope.