Due to human waste, the enterprise sector, manufacturing, mining, oil exploitation, oil and gas are not processed directly into water sources, causing it to be severely polluted, potentially affecting many health and life issues. Including waste seafood processing waste, the slaughter area, food processing and circulation with residues of residues of chemicals used as pollutants. 

1. from humans 
Each day there is a large amount of domestic waste in the course of living, human hygiene from households, hospitals, hotels, schools that waste the environment without processing. 
The basic component of living wastewater is organic substances that are easily biodegradable (cacbohydrat, proteins, lubricants, nutrients, rắn). Depending on the living standards and lifestyle, the amount of waste water and the load of domestic wastewater is different in one day. The higher the living standards, the higher the waste water and the higher the waste load. Therefore disease has conditions for spreading and causing environmental pollution. 
2. agricultural production 
Agricultural activities such as livestock livestock livestock, leftovers from untreated ăn ) and other agricultural production activities, excluding worms, fertilizers from rice paddies, melons, orchards, chứa and hại).

In the process of agricultural production, the majority of farmers use the plant protection drug three times more than the recommended dose. Not only that, farmers use pesticides that have been banned as thiodol, monitor... In the process of composting, spray spray, farmers don' t equip protective equipment. 
At present, the use of chemical fertilizers and chemical protection chemicals in agriculture makes water sources also affected. Residual chemicals will seep into underground water layers that affect water. 
The majority of farmers don' t have storage stores, drugs when they have not been used yet, including near the ăn, near living water. Most of the pesticide bottles after the use were dumped right off the farm, the rest were collected for sale. 
3. from industrial production 
Waste, waste water, from industrial production activities due to the growing urbanization of the urban industry shall be established in the industrial zones which are set up, thus the amount of waste, wastewater of industrial activities, and non - fully disposed of directly to the environment or the rivers, which affect the current quality of water. Natural causes affecting water environment 
Any phenomenon that reduces water quality is considered the cause of water pollution. 
Water pollution caused by rain, snow melts,.. floods. Or because of the products from living organisms that have not yet mentioned their bodies. 
Plants, dead organisms, they're biodegradable, they're biodegradable. Part of it will seep into the ground, then deep into the groundwater, causing pollution, or by the underground water into the big stream. Floods can be lost in clean water, stirring up dirty substances, cáu in sewer systems, carrying a lot of toxic waste from the garbage dump, and in the past chemicals that have been stored. 
Prolonged flooding may be heavily polluted by chemicals used in agriculture,,.. industrial zones. Pollution of water sources due to natural fire (núi, floods, erosion and... may be serious. 
The decline in water quality may be due to the geology of the water source, such as the alum water on alum soil, aluminum, water from the earth' s most common đất. 
Measures to remedy the causes of water pollution 
People are more aware of their environmental protection. 
- enterprises should have sewage treatment tanks before releasing the environment. 
The functional agencies, mass organizations need to regularly urge the inspection of companies to avoid the state of the profits that companies do not observe the environmental protection law. n addition, people should also protect their family health with a family well - drilled water purification system, water purification machines so that they can completely eliminate dirty substances, toxic substances,.. metals. Make pure water for drinking, live without cooking. 
Here are the causes of water pollution today, hoping through this article, people may have more consciousness to protect clean, safer water. Because clean water is essential to having a healthy life.