Along with you, I am strongly of the opinion that people need to know the condition of their system, especially the soil absorption system and understand when change in use habits is needed. For a long time, I have been a proponent of having inspection ports in every system. But, someone has to monitor them, knowing when to look and what to look for along with being willing to alter use patterns when necessary. That is asking a lot of the homeowner, but if we can provide a sensor that is connected to the technology that we all spend our lives peering at these days, there is a good chance that they will react especially if the device can be coupled with software that provides instructions and interpretation of what the monitor is sensing.
Ted Loudon, emeritus professor Michigan State Univ. Biosystems Engineering, January 20, 2015, Lansing, MI