Water pollution is a major environmental issue in India. The largest source of water pollution in India is untreated sewage.

Causes of Water Pollution
Industrial waste
Sewage and waste water
Mining activities
Marine dumping
Accidental Oil leakage
Burning of fossil fuels
Chemical fertilizers and pesticides
Leakage from sewer lines
Global warming
Radioactive waste
Urban development
Leakage from the landfills
Animal waste
Underground storage leakage

Types of water pollution
Water pollution can come from a number of different sources. If the pollution comes from a single source, such as an oil spill, it is called point-source pollution. If the pollution comes from many sources, it is called nonpoint-source pollution.

Most types of pollution affect the immediate area surrounding the source. Sometimes the pollution may affect the environment hundreds of miles away from the source, such as nuclear waste, this is called transboundary pollution.

Types
Surface water pollution
Ground water
Microbiological
Chemical
Suspended matter
Oxygen Depleting
Nutrients