Is it true that domestic sewage can be safely released into the environment without treatment?

Domestic sewage refers to the wastewater generated from household activities, such as bathing, washing clothes and dishes, flushing toilets, and disposing of food waste.

Domestic sewage contains various harmful pollutants, including pathogens (e.g., bacteria, viruses, and parasites), organic matter (e.g., human waste and food waste), nutrients (e.g., nitrogen and phosphorus), and chemicals (e.g., household cleaners and medications). Therefore, it is essential to treat domestic sewage before releasing it into the environment to remove harmful pollutants and reduce the negative impacts on human health and the environment. Common sewage treatment methods include physical, chemical, and biological processes, which aim to remove or reduce pollutants from the wastewater before it is discharged into the environment.