Water leaving our homes generally goes either into a septic tank in the back yard where it seeps back into the ground, or is sent to a sewage-treatment plant through a sewer system. Some water quality tests include measuring the temperature and the pH levels in addition to the bacteria and toxic substances in them.
Soils, particularly well-draining sandy soils, filter water naturally, trapping particles as water percolates down through the soil layers. Filtration mechanically removes large pieces of debris. Bacteria and soil micro-organisms further purify water naturally by breaking down nutrients and contaminants.
The world works in so many interesting ways! Thank you for tuning in,