What does subsection (4) state about the powers of sewage system inspectors?

Subsection (4) emphasizes that sewage system inspectors possess the same powers and duties as the chief building official regarding sewage systems. This means that inspectors are authorized to oversee, evaluate, and ensure compliance with the regulations and standards set forth in the Ontario Building Code concerning sewage systems. Their role is crucial in maintaining public health and safety through proper sewage management.

In this context, inspectors are empowered to conduct a range of activities, including inspections, enforcement of compliance, and taking necessary actions to rectify violations. This shared authority underscores the importance of having qualified personnel to oversee sewage systems, which are critical for environmental and public health.

The other options are inconsistent with the authority granted to sewage system inspectors. For instance, stating that they have no powers concerning sewage systems contradicts the established role described in the code. Suggesting that they can only inspect commercial properties or are limited to documenting failures would restrict their responsibilities and capabilities significantly, which is not reflected in the relevant regulations.