What authority does a municipality not party to an agreement under subsection (1) have?

A municipality that is not party to an agreement under the specified subsection is not permitted to enter into a plumbing agreement with a board of health because such agreements typically require formal participation in specific regulatory frameworks or partnerships that involve particular responsibilities and authority. These agreements often exist to ensure consistency in health and safety standards related to plumbing installations, and unilaterally entering into such arrangements could lead to regulatory inconsistencies or conflicts with existing municipal policies or agreements.

In the context of the other choices, municipalities generally retain the authority to enforce construction penalties, to modify building codes within certain limits, and to halt construction when it violates local ordinances or poses a safety risk. These functions are inherent to a municipality's governance structure and their responsibility for local bylaw enforcement, health and safety standards, and regulatory compliance. This contrasts with the restrictions placed on municipalities when it comes to plumbing agreements, which require participation and agreement with relevant boards of health.