Which of the following systems might be monitored for slight weeping?

Monitoring for slight weeping is primarily associated with water well systems. Well systems may experience weeping or leakage, which can indicate problems such as a failure in the casing or poor seals, potentially leading to contamination of groundwater or loss of water pressure. Detecting weeping is crucial for maintaining the integrity and safety of the well, ensuring that it continues to function properly and that the groundwater remains uncontaminated.

In contrast, heating systems, electrical systems, and sewage systems do not typically involve monitoring for weeping in the same way water wells do. While those systems may have other types of maintenance and monitoring requirements, they usually focus on different operational aspects, such as pressure checks for heating systems or electrical load checks for electrical systems. Sewage systems might monitor for blockages or leaks, but weeping is not a standard term used in the context of their maintenance. Therefore, water well systems are the most relevant in the context of monitoring for slight weeping.