What is the primary criterion for selecting an on-site sewage facility?

When selecting an on-site sewage facility, the primary criterion is that it will function properly. This is crucial because the primary purpose of an OSSF is to treat and safely dispose of sewage. Proper functioning ensures that pathogens and contaminants are effectively removed, thus protecting public health and the environment. An OSSF that does not function correctly can lead to serious health risks and can also result in regulatory violations.

While cost-effectiveness, ease of installation, and minimal maintenance requirements are also important considerations, they do not take precedence over the fundamental need for the system to operate reliably and in compliance with health and environmental standards. If a system is not functioning properly, it could require costly repairs, additional maintenance, or even complete replacement, negating any initial savings. Therefore, ensuring that the selected system will function correctly is paramount in the decision-making process for an OSSF.