If an upper-tier municipality was conducting plumbing inspections under the Ontario Water Resources Act as of July 1, 1993, what is its obligation?

The obligation of an upper-tier municipality that was conducting plumbing inspections under the Ontario Water Resources Act as of July 1, 1993, is to enforce plumbing regulations in its municipalities. This is because, under the framework established by the Ontario Water Resources Act, municipalities have the authority to implement and uphold local plumbing regulations and standards to ensure the safety and compliance of plumbing systems.

Enforcement means that the municipality is responsible for ensuring that all plumbing works are carried out according to the specific codes and regulations that govern plumbing practices. This is crucial for public health and safety, as proper plumbing systems are vital for effective waste disposal and clean water supply. The upper-tier municipality must oversee this process, ensuring that all relevant laws are adhered to within its jurisdiction.

The other options imply actions that are not aligned with the municipality's responsibilities. Stopping plumbing inspections would contradict the obligation to maintain safety standards. Modifying plumbing codes based on inspection findings may be part of a regulatory process but is not an immediate obligation. Coordinating with lower-tier municipalities might be beneficial, but it does not capture the core responsibility of enforcing existing plumbing regulations.