The correct answer is B, Private on-site sewage disposal systems. Title 5 of the Massachusetts Environmental Code establishes requirements governing septic and other qualifying on-site sewage systems.

Its purpose is protection of public health and the environment by regulating design, operation, inspection, repair, and upgrade requirements.

In real estate transactions, Title 5 is particularly important because many sales of properties served by private septic systems trigger inspection requirements. For ordinary sales, the inspection is generally conducted within two years before the transfer, subject to exemptions and special timing provisions.

A Title 5 inspection is not a guarantee that a system will never fail in the future. It evaluates compliance and condition at the time of inspection under the regulatory framework.

The topic is Massachusetts-specific and frequently appears on the state portion of the licensing exam.

Study Guide Reference: Land Use Controls and Regulations — Title 5 Septic Systems.