What happens to waste water after it goes down the drain?

After it goes down the drain, it flows into sewers, and then it is being taken to a sewage treatment plant, then the treated water is discharged into the ocean or any other body of water.The waste that is still in the sewage treatment plant becomes sludge, then gets picked up by trucks that take it to become fertizers. other sludge is discharged into landfills and incinerators. The ash is taken to a landfill. The metal is being recycled. Fertilizers help plants and nutrients are also produced and help plants too. Water is being evaporated then precipitation including rain than enters streets or yards flows into storm drains then into storm sewers. The cycle begins again. The useful water is being used then the thing that I told you is told again