Toxic Chemicals: Heavy metals (lead, mercury), solvents, and acids from factories (e.g., textile, mining, and oil industries).

Thermal Pollution: Power plants discharging hot water, reducing oxygen levels in aquatic ecosystems.

Example: Indonesia’s Citarum River, one of the world’s most polluted due to textile waste.

Fertilizers and Pesticides: Excess nitrates and phosphates cause eutrophication (algal blooms that deplete oxygen).

Livestock Waste: Manure contaminates groundwater with bacteria like E. coli.

Untreated Sewage: 80% of global wastewater is released untreated (UN).

Plastics: 8 million tons of plastic enter oceans annually, forming garbage patches like the Great Pacific Garbage Patch.

Example: The Deepwater Horizon spill (2010) released 4.9 million barrels of oil into the Gulf of Mexico.

Microplastics: Particles <5mm found in 90% of bottled water (WHO).

Pharmaceuticals: Antidepressants and hormones detected in rivers across Europe and the U.S.

Diseases: Cholera, dysentery, and cancers linked to heavy metals.

Vulnerable Populations: 297,000 children under 5 die yearly from diarrhea caused by unsafe water (WHO).

Biodiversity Loss: 40% of freshwater species face extinction (WWF).

Dead Zones: Over 500 oxygen-depleted zones, like the Baltic Sea.

Cleanup Efforts: India’s Ganges River cleanup exceeds $3 billion.

Fisheries Collapse: Plastic pollution costs fisheries $13 billion annually (UN).