Who is responsible for enforcing provisions related to sewage systems in municipalities without municipal organization?

In municipalities that lack formal organization, the enforcement of provisions related to sewage systems often falls under the jurisdiction of multiple entities, which is why all the listed options are significant.

A planning board typically manages land-use planning and can implement regulations regarding sewage disposal as part of land development agreements or zoning laws. Their involvement ensures that sewage systems are considered in the broader context of municipal planning and development.

A conservation authority plays a crucial role in protecting water resources and managing environmental impacts. They can have regulations pertaining to sewage systems, particularly regarding their effects on local ecosystems and water bodies, thereby ensuring compliance with broader environmental standards.

A board of health is responsible for public health and safety, and one of its roles includes the oversight and regulation of sewage systems to prevent health hazards associated with improper waste management. This body is tasked with enforcing health-related provisions that ensure that sewage systems do not pose risks to the community.

Since each of these authorities can address different aspects of sewage system management, they collectively contribute to enforcing related provisions, making the answer that includes all these entities the most comprehensive and accurate choice.