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Causes in brief:
• Polluted water discharged from factories
• Runoff from pollutants (paint, chemicals, rotting organic material) leaching out of landfill
• Oil and petroleum leaks from vehicles washed off the road by the rain into the surrounding
habitat
• Chemical fertilizer runoff from farms and crops
• Acid rain (fumes from factories mixing with rain)
• Sewage discharged into rivers instead of being treated properly
• Over application of pesticides and fertilizers
• Purposeful injection into groundwater as a disposal method
• Interconnections between aquifers during drilling (poor technique)
• Septic tank seepage
• Lagoon seepage
• Sanitary/hazardous landfill seepage
• Cemeteries
• Scrap yards (waste oil and chemical drainage)
• Leaks from sanitary sewers