Water pollution can be caused by a variety of sources, including industrial waste, agricultural runoff, sewage discharge, and other human activities.

Mercury, lead, and arsenic are all common water pollutants that can have serious health effects.

Water treatment, water purification, and water filtration are all processes that can be used to remove pollutants from water.

Chlorination, filtration, and reverse osmosis are all common methods of water treatment that can be used to remove pollutants from water.

The maximum allowable concentration of lead in drinking water is 0.015 mg/L.

The maximum allowable concentration of mercury in drinking water is 0.002 mg/L.

The maximum allowable concentration of arsenic in drinking water is 0.01 mg/L.

Eutrophication is primarily caused by excessive nutrient runoff from agricultural fields and other sources.

Eutrophication can cause algal blooms, fish kills, oxygen depletion, and other negative effects on aquatic ecosystems.

The Clean Water Act is a federal law that regulates water pollution in the United States.

The goals of the Clean Water Act are to restore and maintain the chemical, physical, and biological integrity of the nation's waters, to eliminate the discharge of pollutants into navigable waters, and to achieve water quality standards that protect human health and the environment.

Water pollution control is a complex challenge due to the large number of sources of water pollution, the difficulty of monitoring water pollution, and the cost of water pollution control.

There are many ways to reduce water pollution, including reducing the use of fertilizers and pesticides, improving wastewater treatment, conserving water, and supporting policies that protect water quality.

Individuals can help reduce water pollution by reducing their use of water, disposing of household chemicals properly, picking up litter, and supporting policies that protect water quality.

The future of water pollution control is likely to include more stringent regulations, improved technology, increased public awareness, and a greater emphasis on pollution prevention.