Polluted water refers to water that has been contaminated by harmful substances, making it unsafe for drinking, swimming, or supporting aquatic life. This contamination can come from various sources, including industrial waste, agricultural runoff, and sewage discharge. When pollutants like chemicals, heavy metals, or bacteria enter water bodies, they can disrupt ecosystems and pose health risks to humans and wildlife. The effects of polluted water can be severe. For instance, rivers and lakes may become uninhabitable for fish and other organisms, leading to a decline in biodiversity. Additionally, people who rely on contaminated water sources for drinking or irrigation may face serious health issues, including gastrointestinal diseases and long-term illnesses.