Since it is just water, it should go directly to the laterals. If the septic tank was full, the toilet would not drain. There may be a problem with the tank or the lateral field.
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Put simply a septic tank is always full!
It starts off being full of water.
Over time (a long time) a layer of processed toilet forms at the bottom as compost.
At the same time the lighter than water items, grease,fat, oil, plastic etc: float on the top.
Our toilet is 70% water, the remaining 30%solids are converted into carbon dioxide and methane gases before dropping to the bottom of the tank as a few grams of compost, hence the fact that a correctly sized septic tank , used only for things we had already eaten, will take twenty or thirty years before it requires emptying.
As waste enters the tank, it pushes processed liquid out of the other side.
The level remains the same.
All this stops when the drain field is full of liquid, due perhaps, to a raised water table, if your drain field is sitting in the middle of an underground lake, then you have to wait for the lakes water level to drop, before your drain field will empty.
A company should not install a drain field where there is less than 36 inches of soil between the bottom of the drain field and the seasonal high of ground water.
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