What does a septic system do to your backyard? If livin in the country and someone have a septic system...

If livin in the country and someone have a septic system and no town water or sewer, how does the septic effect your backyard and soil? I own seen sunken lawns already and to some extent not have that problem. How can you avoid this problem beside a septic esp when washing clothes, or have a hose, or even a swimming pool?
Answers:    Makes the grass grow. Along with a septic container there is a drain paddock, it is best to keep consignment off the corral so it wont collapse the tile. I would not put a pool over it.
The septic sytem is a somewhat large concrete pit contained by the ground that holds solid matter it operate on a bacteria principal the microbes breaking down the solid matter. The hose in a septic once it have reached an first performance will spill into this opening which have piping attached and run down to a gravel pit which is fairly weighty in the ground. If near are a few people surrounded by the family you can own multiple gravel pits the heat from the sun mostly helps the gravel pits to dry up. Generally the septics are away from the house. You can also use diverters so that your wash machine river will water your garden