Which of the following criteria would NOT be an indication that the on-site system is working properly?

The criterion indicating that ninety-nine percent adequate treatment is attained before wastewater reaches groundwater or surface water reflects well on the function of an on-site sewage facility (OSSF). This level of treatment is indicative of an effective and efficient system working to minimize environmental impact and ensure that contaminants are removed from wastewater before it is released. The focus here is on the proper treatment capabilities of the system, which is essential for achieving the health and environmental standards set by regulatory agencies like TCEQ.

In contrast, visible pooling of water on the surface and odors above the system are clear signs of potential malfunctions or failures in the operation of an OSSF. These issues typically indicate that the system is not adequately processing wastewater, resulting in surface water problems and unpleasant smells, which could pose health risks. Clear discharge from the system may suggest proper functionality, but it needs to be considered alongside other factors such as treatment efficacy. Factors indicating visible or olfactory signs of failure are typically more direct indicators that something is wrong with the system.