Water pollution occurs when chemicals, sewage, fertilizers and other harmful substances are discharged into waterways without proper treatment. This contamination can poison drinking water and food sources for animals and humans, disrupt ecosystems, and cause health issues. The major causes of water pollution are household, industrial, and agricultural waste as well as litter and nuclear waste. To prevent further water pollution, individuals should use environmentally-friendly household products, limit pesticide and fertilizer use, avoid littering, and support education to change unsustainable habits that threaten the world's water resources for future generations.