Acid rain is a relatively recent phenomenon caused by the burning of fossil fuels, while sewage, factory waste, and agricultural runoff have been major sources of water pollution for centuries.

The Clean Water Act is a comprehensive law that regulates the discharge of pollutants into U.S. waters and sets standards for water quality.

Polio is a viral disease that is spread through contact with infected feces. It is not a waterborne disease.

The Great Stink was a severe outbreak of cholera in London in 1854 that killed over 600 people. The outbreak was traced to contaminated water from the River Thames, and it led to the development of modern sanitation systems.

Thermal pollution is the release of heated water into a natural body of water, which can have a negative impact on aquatic life. It is not as widespread as sewage, factory waste, and agricultural runoff.

The Minamata Disease was a neurological disorder caused by mercury poisoning that affected residents of Minamata, Japan, in the 1950s. The mercury pollution was caused by a chemical plant that discharged mercury into the bay.

The Convention on Long-Range Transboundary Air Pollution is an international agreement that aims to reduce air pollution, but it does not specifically address water quality.

Rachel Carson was a marine biologist and author who wrote the book Silent Spring, which raised awareness about the dangers of pesticides and other pollutants. She was also a vocal advocate for protecting water quality.

Deforestation is a major cause of water pollution in developed countries, but it is not as significant a problem in developing countries.

The Stockholm Conference was a major international conference that was held in Stockholm, Sweden, in 1972. The conference addressed a wide range of environmental issues, including water pollution.

Technological innovation is a key part of the solution to improving water quality in the 21st century. New technologies are being developed to clean up polluted water and to make water use more efficient.

The Deepwater Horizon oil spill was a major oil spill that occurred in the Gulf of Mexico in 2010. The spill was caused by an explosion on the Deepwater Horizon oil rig, which killed 11 people and released millions of barrels of oil into the ocean.

Thermal pollution is not a type of water pollution that is caused by agriculture.

The Flint water crisis was a major water crisis that occurred in Flint, Michigan, in 2014. The crisis was caused by the city's decision to switch its water source from the Detroit River to the Flint River, which was contaminated with lead and other pollutants.

Technological innovation is a key part of the solution to improving water quality in the 21st century. New technologies are being developed to clean up polluted water and to make water use more efficient.