Water Pollution Is the Contamination of Water Bodies

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Water pollution is the contamination of water bodies (e.g. lakes, rivers, oceans and groundwater).
Water pollution affects plants and organisms living in these bodies of water; and, in almost all cases the effect is damaging not only to individual species and populations, but also to the natural biological communities.
Water pollution occurs when pollutants are discharged directly or indirectly into water bodies without adequate treatment to remove harmful compounds.
• 1 Introduction
• 2 Water pollution categories o 2.1 Point source pollution o 2.2 Non–point source pollution
• 3 Groundwater pollution
• 4 Causes of water pollution o 4.1 Pathogens o 4.2 Chemical and other contaminants o 4.3 Thermal pollution
• 5 Transport
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However where such water is not channeled and drains directly to ground it is a non-point source.
[edit] Groundwater pollution
See also: Hydrogeology
Interactions between groundwater and surface water are complex. Consequently, groundwater pollution, sometimes referred to as groundwater contamination, is not as easily classified as surface water pollution.[7] By its very nature, groundwater aquifers are susceptible to contamination from sources that may not directly affect surface water bodies, and the distinction of point vs. non-point source may be irrelevant. A spill or ongoing releases of chemical or radionuclide contaminants into soil (located away from a surface water body) may not create point source or non-point source pollution, but can contaminate the aquifer below, defined as a toxin plume. The movement of the plume, a plume front, can be part of a Hydrological transport model or Groundwater model. Analysis of groundwater contamination may focus on the soil characteristics and site geology, hydrogeology, hydrology, and the nature of the contaminants.
[edit] Causes of water pollution
The specific contaminants leading to pollution in water include a wide spectrum of chemicals, pathogens, and physical or sensory changes such as elevated temperature and discoloration. While many of the chemicals and substances that are regulated may be naturally occurring (calcium, sodium, iron, manganese,
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