Which activities are included in the operation and maintenance of an onsite wastewater system?

The operation and maintenance of an onsite wastewater system primarily concerns the ongoing tasks that ensure the system functions effectively and safely. This includes tests, measurements, adjustments, and repairs, as the correct choice indicates. Regular testing is crucial for monitoring the system's performance and detecting any issues, while measurements ensure that various components are operating within specified parameters. Adjustments and repairs are necessary to address any faults or inefficiencies that may arise over time, thereby preventing system failures and ensuring compliance with health and safety standards.

Other activities listed, such as construction and renovation of buildings, pertain more to the initial installation or modifications to structures rather than directly to the functioning of the wastewater system. Legal documentation and permits generally fall under regulatory and compliance aspects that support system operation but do not directly contribute to day-to-day maintenance activities. Customer service and billing are important for managing service relationships but do not involve the technical or mechanical upkeep of the wastewater system itself. Thus, the focus on tests, measurements, adjustments, and repairs is what distinctly classifies a task as part of the operation and maintenance of an onsite wastewater system.