Contaminated groundwater refers to underground water that has been polluted by harmful substances. This can happen when chemicals, waste, or other pollutants seep into the soil and reach the water supply. Common sources of contamination include industrial activities, agricultural runoff, and leaking underground storage tanks. When groundwater is contaminated, it can pose serious health risks to people and the environment. Drinking water sourced from wells or aquifers may carry these pollutants, leading to potential illnesses. Protecting groundwater quality is essential for safe drinking water and maintaining healthy ecosystems.