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Some people think that any discharge to a body of water is pollution. With current systems for transporting and conducting wastewater generated in homes and industries, it would be almost impossible and unwise to ban the discharge of these wastes into the oceans, rivers and groundwater basins. According to their origin, wastewaters are classified as domestic and industrial. Also, depending on the waste present are classified as organic and inorganic wastewater. There are rare residues such as discharges from cooling processes (leading to thermal changes) and radioactive waste, mainly from hospitals, research laboratories, and nuclear power plants. Not treating wastewater produce adverse effects on human health and the environment. Nowadays various technologies can be used to treat wastewater, known as primary, secondary and tertiary treatments. In Mexico, there are Mexican laws that regulate wastewater and treated water discharges to a water bodies, soils, and municipal urban sewer systems, etcetera. Water resource protection is everyone's responsibility.

¿Por qué deben tratarse las aguas residuales?