Water pollution is one of the most prominent environmental problems threatening human health and living organisms. Life depends on water as an essential element for survival. Water pollution occurs when harmful substances or chemical and biological contaminants enter water sources such as rivers, lakes, and groundwater, leading to the deterioration of water quality and making it unsuitable for human or environmental use. Concept of Water Pollution Water pollution refers to the change in the physical, chemical, or biological properties of water due to the introduction of foreign substances. These substances include industrial pollutants, domestic waste, agricultural pesticides, heavy metals, and pathogenic microorganisms that can cause various diseases. Causes of Water Pollution Several factors contribute to water pollution, including: Industrial waste containing toxic chemicals and heavy metals such as lead and mercury. Sewage water discharged into rivers and lakes without proper treatment. Agricultural pesticides and fertilizers that reach water sources through rainfall and surface runoff. Oil spills from extraction and transportation processes. Solid and plastic waste dumped into water bodies. Effects of Water Pollution Water pollution leads to many environmental and health problems, including: Spread of waterborne diseases such as cholera and typhoid. Death of aquatic organisms due to oxygen depletion or exposure to toxic substances. Degradation of aquatic ecosystems and loss of biodiversity. Negative effects on agriculture and food production. Ways to Reduce Water Pollution To address water pollution, several measures should be taken, including: Treating sewage water before discharging it into the environment. Enforcing strict regulations on industries to prevent the release of pollutants. Reducing the use of chemical pesticides and fertilizers in agriculture. Raising environmental awareness among society members. Using modern water purification technologies, such as advanced filtration and treatment techniques. Conclusion Water pollution poses a real threat to both the environment and human health. Addressing this problem requires cooperation between governments, scientific institutions, and communities to reduce pollution sources and protect water resources. Sustainable water management and the application of modern treatment technologies can significantly help in preserving this vital resource for future generations. Al-Mustaqbal University – The first among Iraqi private universities.