In what scenario is the use of a private sewage disposal system to service multiple properties permitted?

The use of a private sewage disposal system to service multiple properties is allowed in the scenario where common property under joint ownership is provided. This means that the properties are collectively owned, which allows for a shared sewage disposal system to be established and maintained. It is essential that all owners are in agreement and have established a clear management plan for the system, which is typically outlined in property agreements. This arrangement provides a practical and legally compliant means of managing sewage on properties that are closely linked.

While other options might seem plausible under certain conditions, they do not align with the specific regulations governing the use of private sewage systems. For example, individual ownership does not inherently support shared systems, and the availability of public sewer systems is a significant factor that typically prohibits the use of private systems if they are accessible. The demographic threshold regarding population also does not directly correlate to the legality of multi-property private sewage disposal systems. Therefore, joint ownership is the key aspect that allows such systems to function legally and effectively.