Usually nobody is willing or able to do this, but the only way to accurately check a tanks "fullness" level is to measure the solids. It is easier to calculate how often the tank should be pumped based upon the size of the tank and usage. There is a useful chart on my website hunnywagon.com that will help you determine if it's time to pump. Most households fit into the "every 3 years" category.
Okay, getting back to the messy way...
The baffles in the tank that allow for proper functionality are only tall enough to safely handle 6 to 8 inches of floating solids before particulates begin washing out into the leach field. On the bottom of the tank, there is also a layer of solids that build up over time. These are a bit more difficult to measure. When they rise to a level approaching the bottom of the baffle, particulates will also be washed out. It is common for these two solid layers to be different in thickness so don't assume the bottom is the same as the top. Professionals will sometimes use a special tool that removes a sample in a clear tube to accurately measure solid contents.
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