A water level indicator that has not been tested in 6 years is an example of a/an _____

A water level indicator that has not been tested in 6 years represents a critical deficiency because it directly impacts the safety and functionality of the water-based system in which it is used. Critical deficiencies are serious issues that can lead to system failure or inability to perform as intended, putting property and lives at risk.

In the context of water-based systems, indicators play a vital role in ensuring that the system is functioning correctly. Regular testing is essential to confirm that the indicator is accurate and reliable. An absence of testing for such a prolonged period suggests that there is a significant risk that the readings may be unreliable, which could result in improper management of the water supply or other related hazards.

Minor, major, and non-critical deficiencies indicate various levels of issues, but in this scenario, the lack of testing for 6 years signifies a severe oversight that compromises the integrity of the system. Thus, it is categorized as a critical deficiency that needs immediate attention to remedy and ensure the continued safety of the system.