More on Nonpoint Source Pollution
Usually, if pollutants come from one source into that water body, (such as a factory disposal) it is
called a point source pollution.
If the pollution comes from many sources, it is called nonpoint-source pollution.
Pollution can also affect only one area in which the pollution happened. But in many cases, especially
for flowing water, the contamination spreads to many other places. This is called transboundary pollution.
In many of the states in the USA, there are reports that nonpoint source pollution is the leading
remaining cause of water quality problems. These reports may not be unique to the USA alone,
and very likely a similar scenario would be so in many other developed countries.
Nonpoint source pollution can include:
Excess fertilizers, herbicides and insecticides from agricultural lands and residential areas
Oil, grease and toxic chemicals from urban runoff and energy production
Sediment from improperly managed construction sites, crop and forest lands, and eroding streambanks
Salt from irrigation practices and acid drainage from abandoned mines
Bacteria and nutrients from livestock, pet wastes and faulty septic systems
Atmospheric deposition and hydromodification
—Source: United States Environmental Protection Agency
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