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In many rural areas, families rely on unprotected wells, rivers, or ponds for their water needs. These sources are often contaminated by human waste, livestock runoff, or industrial pollutants. For example, heavy metals from mining and untreated industrial discharge have polluted major rivers in parts of Asia and Africa, increasing cancer rates and causing irreversible health problems. Without investments in water quality monitoring and treatment, communities face chronic exposure to dangerous contaminants.