mercury (element)|mercury) and persistent organic pollutants. This is known as biomagnification which is occasionally used interchangeably with bioaccumulation.

The big gyres in the oceans trap floating plastic debris.

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Natural phenomena such as volcanoes, algae blooms, storms, earthquakes, runoff, decay of vegetation and oil seeps can cause changes in water quality and the ecological status of water.

Increases in nutrient loading may lead to eutrophication.

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In some areas of the world the influence can be traced hundred miles from the mouth by studies using hydrology transport models.

Advanced computer models such as SWMM or the DSSAM Model have been used in many locations worldwide to examine the fate of pollutants in aquatic systems.

Fish and shellfish kills have been reported, because toxins climb the foodchain after small fish consume copepods, then large fish eat smaller fish, etc.